changeset 54724:62f373a53296

8222665: Update Graal Reviewed-by: kvn
author jwilhelm
date Mon, 06 May 2019 21:50:20 +0200
parents 1abca1170080
children bfa52d3068f5
files src/jdk.internal.vm.compiler.management/share/classes/org.graalvm.compiler.hotspot.management/src/org/graalvm/compiler/hotspot/management/JMXServiceProvider.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.asm.amd64/src/org/graalvm/compiler/asm/amd64/AMD64Assembler.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.amd64/src/org/graalvm/compiler/core/amd64/AMD64ArithmeticLIRGenerator.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/GraalOptions.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/type/FloatStamp.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/BciBlockMappingTest.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/ConditionalEliminationPiTest.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/ConditionalEliminationTest16.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot.amd64/src/org/graalvm/compiler/hotspot/amd64/AMD64HotSpotLoweringProvider.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot.test/src/org/graalvm/compiler/hotspot/test/JVMCIVersionCheckTest.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/CompilationTask.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/GraalHotSpotVMConfig.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/JVMCIVersionCheck.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/SymbolicSnippetEncoder.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/meta/DefaultHotSpotLoweringProvider.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/HotSpotReplacementsUtil.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/MonitorSnippets.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/NewObjectSnippets.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.java/src/org/graalvm/compiler/java/BciBlockMapping.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir.aarch64/src/org/graalvm/compiler/lir/aarch64/AArch64Move.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir.amd64/src/org/graalvm/compiler/lir/amd64/AMD64ZeroMemoryOp.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir/src/org/graalvm/compiler/lir/gen/ArithmeticLIRGeneratorTool.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes.test/src/org/graalvm/compiler/nodes/test/PrimitiveStampBoundaryTest.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/calc/SignedRemNode.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/ArrayLengthNode.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/LoadIndexedNode.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/NewInstanceNode.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/StoreFieldNode.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/StoreIndexedNode.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/spi/LoweringProvider.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.phases.common/src/org/graalvm/compiler/phases/common/ConditionalEliminationPhase.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.printer/src/org/graalvm/compiler/printer/BinaryGraphPrinter.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements.aarch64/src/org/graalvm/compiler/replacements/aarch64/AArch64GraphBuilderPlugins.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements/src/org/graalvm/compiler/replacements/nodes/ZeroMemoryNode.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.virtual/src/org/graalvm/compiler/virtual/phases/ea/GraphEffectList.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.graphio/src/org/graalvm/graphio/GraphProtocol.java src/jdk.internal.vm.compiler/share/classes/org.graalvm.micro.benchmarks/src/micro/benchmarks/ArrayAllocationBenchmark.java
diffstat 37 files changed, 2417 insertions(+), 199 deletions(-) [+]
line wrap: on
line diff
--- a/src/jdk.internal.vm.compiler.management/share/classes/org.graalvm.compiler.hotspot.management/src/org/graalvm/compiler/hotspot/management/JMXServiceProvider.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler.management/share/classes/org.graalvm.compiler.hotspot.management/src/org/graalvm/compiler/hotspot/management/JMXServiceProvider.java	Mon May 06 21:50:20 2019 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -35,7 +35,7 @@
 import com.sun.management.ThreadMXBean;
 
 /**
- * Implementation of {@link JMXService} for JDK 11 and later.
+ * Implementation of {@link JMXService} for JDK 13 and later.
  */
 @ServiceProvider(JMXService.class)
 public class JMXServiceProvider extends JMXService {
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.asm.amd64/src/org/graalvm/compiler/asm/amd64/AMD64Assembler.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.asm.amd64/src/org/graalvm/compiler/asm/amd64/AMD64Assembler.java	Mon May 06 21:50:20 2019 +0200
@@ -3003,6 +3003,18 @@
         emitByte(0x99);
     }
 
+    public final void repStosb() {
+        emitByte(0xf3);
+        rexw();
+        emitByte(0xaa);
+    }
+
+    public final void repStosq() {
+        emitByte(0xf3);
+        rexw();
+        emitByte(0xab);
+    }
+
     public final void cmovq(ConditionFlag cc, Register dst, Register src) {
         prefixq(dst, src);
         emitByte(0x0F);
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.amd64/src/org/graalvm/compiler/core/amd64/AMD64ArithmeticLIRGenerator.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.amd64/src/org/graalvm/compiler/core/amd64/AMD64ArithmeticLIRGenerator.java	Mon May 06 21:50:20 2019 +0200
@@ -121,6 +121,7 @@
 import org.graalvm.compiler.lir.amd64.AMD64ShiftOp;
 import org.graalvm.compiler.lir.amd64.AMD64SignExtendOp;
 import org.graalvm.compiler.lir.amd64.AMD64Unary;
+import org.graalvm.compiler.lir.amd64.AMD64ZeroMemoryOp;
 import org.graalvm.compiler.lir.amd64.vector.AMD64VectorBinary;
 import org.graalvm.compiler.lir.amd64.vector.AMD64VectorBinary.AVXBinaryOp;
 import org.graalvm.compiler.lir.amd64.vector.AMD64VectorUnary;
@@ -1102,6 +1103,12 @@
         return new AMD64MathPowOp().emitLIRWrapper(getLIRGen(), x, y);
     }
 
+    @Override
+    public void emitZeroMemory(Value address, Value length) {
+        RegisterValue lengthReg = moveToReg(AMD64.rcx, length);
+        getLIRGen().append(new AMD64ZeroMemoryOp(getAMD64LIRGen().asAddressValue(address), lengthReg));
+    }
+
     protected AMD64LIRGenerator getAMD64LIRGen() {
         return (AMD64LIRGenerator) getLIRGen();
     }
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/GraalOptions.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/GraalOptions.java	Mon May 06 21:50:20 2019 +0200
@@ -279,9 +279,13 @@
     @Option(help = "Enable inlining decision tracing in stubs and snippets.", type = OptionType.Debug)
     public static final OptionKey<Boolean> TraceInliningForStubsAndSnippets = new OptionKey<>(false);
 
-    @Option(help = "Use Graal-generated stubs for complicated LIR operations instead of embedding all the emitted code.")
+    @Option(help = "Use Graal-generated stubs for complicated LIR operations instead of embedding all the emitted code.", type = OptionType.Expert)
     public static final OptionKey<Boolean> UseGraalStubs = new OptionKey<>(true);
 
     @Option(help = "Encode and decode snippets and substitutions before parsing to test libgraal code path. This option is ignored in the context of libgraal.")
     public static final OptionKey<Boolean> UseEncodedGraphs = new OptionKey<>(false);
+
+    @Option(help = "If applicable, use bulk zeroing instructions when the zeroing size in bytes exceeds this threshold.", type = OptionType.Expert)
+    public static final OptionKey<Integer> MinimalBulkZeroingSize = new OptionKey<>(2048);
+
 }
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/type/FloatStamp.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/type/FloatStamp.java	Mon May 06 21:50:20 2019 +0200
@@ -318,8 +318,10 @@
         /*
          * There are many forms of NaNs and any operations on them can silently convert them into
          * the canonical NaN.
+         *
+         * We need to exclude 0 here since it can contain -0.0 && 0.0 .
          */
-        return (Double.compare(lowerBound, upperBound) == 0 && nonNaN);
+        return (Double.compare(lowerBound, upperBound) == 0 && nonNaN) && lowerBound != 0;
     }
 
     private static FloatStamp stampForConstant(Constant constant) {
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/BciBlockMappingTest.java	Mon May 06 21:50:20 2019 +0200
@@ -0,0 +1,1416 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+
+package org.graalvm.compiler.core.test;
+
+import org.graalvm.compiler.java.BciBlockMapping;
+import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
+import org.junit.Test;
+
+/**
+ * Tests that the {@link BciBlockMapping} can handle code with a lot of blocks. The test code is
+ * derived from the {@code ImplicitStringConcatShapes} test in OpenJDK.
+ */
+public class BciBlockMappingTest extends GraalCompilerTest {
+
+    @Test
+    public void test() {
+        parseEager("run", AllowAssumptions.NO);
+    }
+
+    @SuppressWarnings("unused")
+    public static void blackhole(String expected, String actual) {
+    }
+
+    static double aDouble = -96.0d;
+
+    public void run() {
+        blackhole("-96.0", "" + aDouble);
+        blackhole("null", "" + aDouble);
+        blackhole("\u045176", "" + aDouble);
+        blackhole("92", "" + aDouble);
+        blackhole("51", "" + aDouble);
+        blackhole("null", "" + aDouble);
+        blackhole("-54", "" + aDouble);
+        blackhole("-87.0", "" + aDouble);
+        blackhole("null", "" + aDouble);
+        blackhole("19", "" + aDouble);
+        blackhole("-41", "" + aDouble);
+        blackhole("null", "" + aDouble);
+        blackhole("T", "" + aDouble);
+        blackhole("-42.0", "" + aDouble);
+        blackhole("25", "" + aDouble);
+        blackhole("null", "" + aDouble);
+        blackhole("-1410065408", "" + aDouble);
+        blackhole("8.0", "" + aDouble);
+        blackhole("55.0", "" + aDouble);
+        blackhole("97000000", "" + aDouble);
+        blackhole("-9900", "" + aDouble);
+        blackhole("935228928", "" + aDouble);
+        blackhole("-8400", "" + aDouble);
+        blackhole("C(82)", "" + aDouble);
+        blackhole("null", "" + aDouble);
+        blackhole("true", "" + aDouble);
+        blackhole("3900", "" + aDouble);
+        blackhole("null", "" + aDouble);
+        blackhole("94000000", "" + aDouble);
+        blackhole("null", "" + aDouble);
+        blackhole("true", "" + aDouble);
+        blackhole("5500", "" + aDouble);
+        blackhole("-2900", "" + aDouble);
+        blackhole("-194313216", "" + aDouble);
+        blackhole("12", "" + aDouble);
+        blackhole("C(87)", "" + aDouble);
+        blackhole("91", "" + aDouble);
+        blackhole("21", "" + aDouble);
+        blackhole("18", "" + aDouble);
+        blackhole("null", "" + aDouble);
+        blackhole("null", "" + aDouble);
+        blackhole("\u045180", "" + aDouble);
+        blackhole("C", "" + aDouble);
+        blackhole("75", "" + aDouble);
+        blackhole("-43", "" + aDouble);
+        blackhole("80", "" + aDouble);
+        blackhole("null", "" + aDouble);
+        blackhole("-52.0", "" + aDouble);
+        blackhole("75000000", "" + aDouble);
+        blackhole("44", "" + aDouble);
+        blackhole("-1705032704", "" + aDouble);
+        blackhole("null", "" + aDouble);
+        blackhole("83.0", "" + aDouble);
+        blackhole("I", "" + aDouble);
+        blackhole("94.0", "" + aDouble);
+        blackhole("12.0", "" + aDouble);
+        blackhole("-99.0", "" + aDouble);
+        blackhole("17.0", "" + aDouble);
+        blackhole("-84.0", "" + aDouble);
+        blackhole("58000000", "" + aDouble);
+        blackhole("-55000000", "" + aDouble);
+        blackhole("1460392448", "" + aDouble);
+        blackhole("C(70)", "" + aDouble);
+        blackhole("\u04511", "" + aDouble);
+        blackhole("8000", "" + aDouble);
+        blackhole("18", "" + aDouble);
+        blackhole("-1000000", "" + aDouble);
+        blackhole("1000000", "" + aDouble);
+        blackhole("null", "" + aDouble);
+        blackhole("false", "" + aDouble);
+        blackhole("null", "" + aDouble);
+        blackhole("-2000000", "" + aDouble);
+        blackhole("-820130816", "" + aDouble);
+        blackhole("null", "" + aDouble);
+        blackhole("25000000", "" + aDouble);
+        blackhole("-96.0-96.0", "" + aDouble);
+        blackhole("-96.0null", "" + aDouble);
+        blackhole("-96.0\u045176", "" + aDouble);
+        blackhole("-96.092", "" + aDouble);
+        blackhole("-96.051", "" + aDouble);
+        blackhole("-96.0null", "" + aDouble);
+        blackhole("-96.0-54", "" + aDouble);
+        blackhole("-96.0-87.0", "" + aDouble);
+        blackhole("-96.0null", "" + aDouble);
+        blackhole("-96.019", "" + aDouble);
+        blackhole("-96.0-41", "" + aDouble);
+        blackhole("-96.0null", "" + aDouble);
+        blackhole("-96.0T", "" + aDouble);
+        blackhole("-96.0-42.0", "" + aDouble);
+        blackhole("-96.025", "" + aDouble);
+        blackhole("-96.0null", "" + aDouble);
+        blackhole("-96.0-1410065408", "" + aDouble);
+        blackhole("-96.08.0", "" + aDouble);
+        blackhole("-96.055.0", "" + aDouble);
+        blackhole("-96.097000000", "" + aDouble);
+        blackhole("-96.0-9900", "" + aDouble);
+        blackhole("-96.0935228928", "" + aDouble);
+        blackhole("-96.0-8400", "" + aDouble);
+        blackhole("-96.0C(82)", "" + aDouble);
+        blackhole("-96.0null", "" + aDouble);
+        blackhole("-96.0true", "" + aDouble);
+        blackhole("-96.03900", "" + aDouble);
+        blackhole("-96.0null", "" + aDouble);
+        blackhole("-96.094000000", "" + aDouble);
+        blackhole("-96.0null", "" + aDouble);
+        blackhole("-96.0true", "" + aDouble);
+        blackhole("-96.05500", "" + aDouble);
+        blackhole("-96.0-2900", "" + aDouble);
+        blackhole("-96.0-194313216", "" + aDouble);
+        blackhole("-96.012", "" + aDouble);
+        blackhole("-96.0C(87)", "" + aDouble);
+        blackhole("-96.091", "" + aDouble);
+        blackhole("-96.021", "" + aDouble);
+        blackhole("-96.018", "" + aDouble);
+        blackhole("-96.0null", "" + aDouble);
+        blackhole("-96.0null", "" + aDouble);
+        blackhole("-96.0\u045180", "" + aDouble);
+        blackhole("-96.0C", "" + aDouble);
+        blackhole("-96.075", "" + aDouble);
+        blackhole("-96.0-43", "" + aDouble);
+        blackhole("-96.080", "" + aDouble);
+        blackhole("-96.0null", "" + aDouble);
+        blackhole("-96.0-52.0", "" + aDouble);
+        blackhole("-96.075000000", "" + aDouble);
+        blackhole("-96.044", "" + aDouble);
+        blackhole("-96.0-1705032704", "" + aDouble);
+        blackhole("-96.0null", "" + aDouble);
+        blackhole("-96.083.0", "" + aDouble);
+        blackhole("-96.0I", "" + aDouble);
+        blackhole("-96.094.0", "" + aDouble);
+        blackhole("-96.012.0", "" + aDouble);
+        blackhole("-96.0-99.0", "" + aDouble);
+        blackhole("-96.017.0", "" + aDouble);
+        blackhole("-96.0-84.0", "" + aDouble);
+        blackhole("-96.058000000", "" + aDouble);
+        blackhole("-96.0-55000000", "" + aDouble);
+        blackhole("-96.01460392448", "" + aDouble);
+        blackhole("-96.0C(70)", "" + aDouble);
+        blackhole("-96.0\u04511", "" + aDouble);
+        blackhole("-96.08000", "" + aDouble);
+        blackhole("-96.018", "" + aDouble);
+        blackhole("-96.0-1000000", "" + aDouble);
+        blackhole("-96.01000000", "" + aDouble);
+        blackhole("-96.0null", "" + aDouble);
+        blackhole("-96.0false", "" + aDouble);
+        blackhole("-96.0null", "" + aDouble);
+        blackhole("-96.0-2000000", "" + aDouble);
+        blackhole("-96.0-820130816", "" + aDouble);
+        blackhole("-96.0null", "" + aDouble);
+        blackhole("-96.025000000", "" + aDouble);
+        blackhole("null-96.0", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null\u045176", "" + aDouble);
+        blackhole("null92", "" + aDouble);
+        blackhole("null51", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null-54", "" + aDouble);
+        blackhole("null-87.0", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null19", "" + aDouble);
+        blackhole("null-41", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("nullT", "" + aDouble);
+        blackhole("null-42.0", "" + aDouble);
+        blackhole("null25", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null-1410065408", "" + aDouble);
+        blackhole("null8.0", "" + aDouble);
+        blackhole("null55.0", "" + aDouble);
+        blackhole("null97000000", "" + aDouble);
+        blackhole("null-9900", "" + aDouble);
+        blackhole("null935228928", "" + aDouble);
+        blackhole("null-8400", "" + aDouble);
+        blackhole("nullC(82)", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("nulltrue", "" + aDouble);
+        blackhole("null3900", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null94000000", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("nulltrue", "" + aDouble);
+        blackhole("null5500", "" + aDouble);
+        blackhole("null-2900", "" + aDouble);
+        blackhole("null-194313216", "" + aDouble);
+        blackhole("null12", "" + aDouble);
+        blackhole("nullC(87)", "" + aDouble);
+        blackhole("null91", "" + aDouble);
+        blackhole("null21", "" + aDouble);
+        blackhole("null18", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null\u045180", "" + aDouble);
+        blackhole("nullC", "" + aDouble);
+        blackhole("null75", "" + aDouble);
+        blackhole("null-43", "" + aDouble);
+        blackhole("null80", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null-52.0", "" + aDouble);
+        blackhole("null75000000", "" + aDouble);
+        blackhole("null44", "" + aDouble);
+        blackhole("null-1705032704", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null83.0", "" + aDouble);
+        blackhole("nullI", "" + aDouble);
+        blackhole("null94.0", "" + aDouble);
+        blackhole("null12.0", "" + aDouble);
+        blackhole("null-99.0", "" + aDouble);
+        blackhole("null17.0", "" + aDouble);
+        blackhole("null-84.0", "" + aDouble);
+        blackhole("null58000000", "" + aDouble);
+        blackhole("null-55000000", "" + aDouble);
+        blackhole("null1460392448", "" + aDouble);
+        blackhole("nullC(70)", "" + aDouble);
+        blackhole("null\u04511", "" + aDouble);
+        blackhole("null8000", "" + aDouble);
+        blackhole("null18", "" + aDouble);
+        blackhole("null-1000000", "" + aDouble);
+        blackhole("null1000000", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("nullfalse", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null-2000000", "" + aDouble);
+        blackhole("null-820130816", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null25000000", "" + aDouble);
+        blackhole("\u045176-96.0", "" + aDouble);
+        blackhole("\u045176null", "" + aDouble);
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+        blackhole("2518", "" + aDouble);
+        blackhole("25-1000000", "" + aDouble);
+        blackhole("251000000", "" + aDouble);
+        blackhole("25null", "" + aDouble);
+        blackhole("25false", "" + aDouble);
+        blackhole("25null", "" + aDouble);
+        blackhole("25-2000000", "" + aDouble);
+        blackhole("25-820130816", "" + aDouble);
+        blackhole("25null", "" + aDouble);
+        blackhole("2525000000", "" + aDouble);
+        blackhole("null-96.0", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null\u045176", "" + aDouble);
+        blackhole("null92", "" + aDouble);
+        blackhole("null51", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null-54", "" + aDouble);
+        blackhole("null-87.0", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null19", "" + aDouble);
+        blackhole("null-41", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("nullT", "" + aDouble);
+        blackhole("null-42.0", "" + aDouble);
+        blackhole("null25", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null-1410065408", "" + aDouble);
+        blackhole("null8.0", "" + aDouble);
+        blackhole("null55.0", "" + aDouble);
+        blackhole("null97000000", "" + aDouble);
+        blackhole("null-9900", "" + aDouble);
+        blackhole("null935228928", "" + aDouble);
+        blackhole("null-8400", "" + aDouble);
+        blackhole("nullC(82)", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("nulltrue", "" + aDouble);
+        blackhole("null3900", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null94000000", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("nulltrue", "" + aDouble);
+        blackhole("null5500", "" + aDouble);
+        blackhole("null-2900", "" + aDouble);
+        blackhole("null-194313216", "" + aDouble);
+        blackhole("null12", "" + aDouble);
+        blackhole("nullC(87)", "" + aDouble);
+        blackhole("null91", "" + aDouble);
+        blackhole("null21", "" + aDouble);
+        blackhole("null18", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null\u045180", "" + aDouble);
+        blackhole("nullC", "" + aDouble);
+        blackhole("null75", "" + aDouble);
+        blackhole("null-43", "" + aDouble);
+        blackhole("null80", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null-52.0", "" + aDouble);
+        blackhole("null75000000", "" + aDouble);
+        blackhole("null44", "" + aDouble);
+        blackhole("null-1705032704", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null83.0", "" + aDouble);
+        blackhole("nullI", "" + aDouble);
+        blackhole("null94.0", "" + aDouble);
+        blackhole("null12.0", "" + aDouble);
+        blackhole("null-99.0", "" + aDouble);
+        blackhole("null17.0", "" + aDouble);
+        blackhole("null-84.0", "" + aDouble);
+        blackhole("null58000000", "" + aDouble);
+        blackhole("null-55000000", "" + aDouble);
+        blackhole("null1460392448", "" + aDouble);
+        blackhole("nullC(70)", "" + aDouble);
+        blackhole("null\u04511", "" + aDouble);
+        blackhole("null8000", "" + aDouble);
+        blackhole("null18", "" + aDouble);
+        blackhole("null-1000000", "" + aDouble);
+        blackhole("null1000000", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("nullfalse", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null-2000000", "" + aDouble);
+        blackhole("null-820130816", "" + aDouble);
+        blackhole("nullnull", "" + aDouble);
+        blackhole("null25000000", "" + aDouble);
+        blackhole("-1410065408-96.0", "" + aDouble);
+        blackhole("-1410065408null", "" + aDouble);
+        blackhole("-1410065408\u045176", "" + aDouble);
+        blackhole("-141006540892", "" + aDouble);
+        blackhole("-141006540851", "" + aDouble);
+        blackhole("-1410065408null", "" + aDouble);
+        blackhole("-1410065408-54", "" + aDouble);
+        blackhole("-1410065408-87.0", "" + aDouble);
+        blackhole("-1410065408null", "" + aDouble);
+        blackhole("-141006540819", "" + aDouble);
+        blackhole("-1410065408-41", "" + aDouble);
+        blackhole("-1410065408null", "" + aDouble);
+        blackhole("-1410065408T", "" + aDouble);
+        blackhole("-1410065408-42.0", "" + aDouble);
+        blackhole("-141006540825", "" + aDouble);
+        blackhole("-1410065408null", "" + aDouble);
+        blackhole("-1410065408-1410065408", "" + aDouble);
+        blackhole("-14100654088.0", "" + aDouble);
+        blackhole("-141006540855.0", "" + aDouble);
+        blackhole("-141006540897000000", "" + aDouble);
+        blackhole("-1410065408-9900", "" + aDouble);
+        blackhole("-1410065408935228928", "" + aDouble);
+        blackhole("-1410065408-8400", "" + aDouble);
+        blackhole("-1410065408C(82)", "" + aDouble);
+        blackhole("-1410065408null", "" + aDouble);
+        blackhole("-1410065408true", "" + aDouble);
+        blackhole("-14100654083900", "" + aDouble);
+        blackhole("-1410065408null", "" + aDouble);
+        blackhole("-141006540894000000", "" + aDouble);
+        blackhole("-1410065408null", "" + aDouble);
+        blackhole("-1410065408true", "" + aDouble);
+        blackhole("-14100654085500", "" + aDouble);
+        blackhole("-1410065408-2900", "" + aDouble);
+        blackhole("-1410065408-194313216", "" + aDouble);
+        blackhole("-141006540812", "" + aDouble);
+        blackhole("-1410065408C(87)", "" + aDouble);
+        blackhole("-141006540891", "" + aDouble);
+        blackhole("-141006540821", "" + aDouble);
+        blackhole("-141006540818", "" + aDouble);
+        blackhole("-1410065408null", "" + aDouble);
+        blackhole("-1410065408null", "" + aDouble);
+        blackhole("-1410065408\u045180", "" + aDouble);
+        blackhole("-1410065408C", "" + aDouble);
+        blackhole("-141006540875", "" + aDouble);
+        blackhole("-1410065408-43", "" + aDouble);
+        blackhole("-141006540880", "" + aDouble);
+        blackhole("-1410065408null", "" + aDouble);
+        blackhole("-1410065408-52.0", "" + aDouble);
+        blackhole("-141006540875000000", "" + aDouble);
+        blackhole("-141006540844", "" + aDouble);
+        blackhole("-1410065408-1705032704", "" + aDouble);
+        blackhole("-1410065408null", "" + aDouble);
+        blackhole("-141006540883.0", "" + aDouble);
+        blackhole("-1410065408I", "" + aDouble);
+        blackhole("-141006540894.0", "" + aDouble);
+        blackhole("-141006540812.0", "" + aDouble);
+        blackhole("-1410065408-99.0", "" + aDouble);
+        blackhole("-141006540817.0", "" + aDouble);
+        blackhole("-1410065408-84.0", "" + aDouble);
+        blackhole("-141006540858000000", "" + aDouble);
+        blackhole("-1410065408-55000000", "" + aDouble);
+        blackhole("-14100654081460392448", "" + aDouble);
+        blackhole("-1410065408C(70)", "" + aDouble);
+        blackhole("-1410065408\u04511", "" + aDouble);
+        blackhole("-14100654088000", "" + aDouble);
+        blackhole("-141006540818", "" + aDouble);
+        blackhole("-1410065408-1000000", "" + aDouble);
+        blackhole("-14100654081000000", "" + aDouble);
+        blackhole("-1410065408null", "" + aDouble);
+        blackhole("-1410065408false", "" + aDouble);
+        blackhole("-1410065408null", "" + aDouble);
+        blackhole("-1410065408-2000000", "" + aDouble);
+        blackhole("-1410065408-820130816", "" + aDouble);
+        blackhole("-1410065408null", "" + aDouble);
+        blackhole("-141006540825000000", "" + aDouble);
+        blackhole("8.0-96.0", "" + aDouble);
+        blackhole("8.0null", "" + aDouble);
+        blackhole("8.0\u045176", "" + aDouble);
+        blackhole("8.092", "" + aDouble);
+        blackhole("8.051", "" + aDouble);
+        blackhole("8.0null", "" + aDouble);
+        blackhole("8.0-54", "" + aDouble);
+        blackhole("8.0-87.0", "" + aDouble);
+        blackhole("8.0null", "" + aDouble);
+        blackhole("8.019", "" + aDouble);
+        blackhole("8.0-41", "" + aDouble);
+        blackhole("8.0null", "" + aDouble);
+        blackhole("8.0T", "" + aDouble);
+        blackhole("8.0-42.0", "" + aDouble);
+        blackhole("8.025", "" + aDouble);
+        blackhole("C(87)-96.0", "" + aDouble);
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/ConditionalEliminationPiTest.java	Mon May 06 21:50:20 2019 +0200
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+
+package org.graalvm.compiler.core.test;
+
+import org.junit.Test;
+
+public class ConditionalEliminationPiTest extends ConditionalEliminationTestBase {
+
+    static int SideEffect;
+
+    static double oracleValue1 = -0.0;
+    static double oracleValue2;
+
+    public static double testSnippet1(int a) {
+        double phi;
+        if (a > 0) {
+            double oracle = oracleValue1;
+            if (oracle == 0.0) {
+                SideEffect = 1;
+            } else {
+                return 123;
+            }
+            phi = oracle;
+        } else {
+            double oracle = oracleValue2;
+            if (oracle == 0.0) {
+                SideEffect = 1;
+                phi = oracle;
+            } else {
+                return 0;
+            }
+        }
+        if (Double.doubleToRawLongBits(phi) == Double.doubleToRawLongBits(-0.0)) {
+            return 12;
+        }
+        return 2;
+    }
+
+    @Test
+    public void test1() {
+        test("testSnippet1", 1);
+    }
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/ConditionalEliminationTest16.java	Mon May 06 21:50:20 2019 +0200
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+
+package org.graalvm.compiler.core.test;
+
+import org.graalvm.compiler.api.directives.GraalDirectives;
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.core.common.type.StampPair;
+import org.graalvm.compiler.core.common.type.TypeReference;
+import org.graalvm.compiler.nodes.ParameterNode;
+import org.graalvm.compiler.nodes.PiNode;
+import org.graalvm.compiler.nodes.StructuredGraph;
+import org.graalvm.compiler.phases.common.CanonicalizerPhase;
+import org.junit.Test;
+
+import jdk.vm.ci.meta.ResolvedJavaMethod;
+
+/**
+ * Check that multiple bounds checks are correctly grouped together.
+ */
+public class ConditionalEliminationTest16 extends ConditionalEliminationTestBase {
+
+    public static int testCastExactInstance(Object object) {
+        if (object.getClass() == Integer.class) {
+            return ((Integer) object).intValue();
+        }
+        GraalDirectives.deoptimizeAndInvalidate();
+        return -1;
+    }
+
+    @Override
+    protected boolean checkHighTierGraph(StructuredGraph graph) {
+        for (ParameterNode param : graph.getNodes().filter(ParameterNode.class)) {
+            if (param.index() == 0) {
+                ParameterNode newParam = new ParameterNode(0, StampPair.createSingle(StampFactory.object(TypeReference.createExactTrusted(getMetaAccess().lookupJavaType(Integer.class)))));
+                graph.addWithoutUnique(newParam);
+                param.replaceAtUsages(newParam);
+                param.safeDelete();
+                break;
+            }
+        }
+        new CanonicalizerPhase().apply(graph, getDefaultHighTierContext());
+        return super.checkHighTierGraph(graph);
+    }
+
+    @Override
+    protected boolean checkMidTierGraph(StructuredGraph graph) {
+        int count = 0;
+        for (PiNode node : graph.getNodes().filter(PiNode.class)) {
+            assertTrue(node.getGuard() != null, "must have guarding node");
+            count++;
+        }
+        assertTrue(count > 0, "expected at least one Pi");
+        return super.checkMidTierGraph(graph);
+    }
+
+    @Test
+    public void test1() {
+        ResolvedJavaMethod method = getResolvedJavaMethod("testCastExactInstance");
+        StructuredGraph graph = parseForCompile(method);
+        compile(method, graph);
+    }
+}
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot.amd64/src/org/graalvm/compiler/hotspot/amd64/AMD64HotSpotLoweringProvider.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot.amd64/src/org/graalvm/compiler/hotspot/amd64/AMD64HotSpotLoweringProvider.java	Mon May 06 21:50:20 2019 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -129,4 +129,9 @@
     public Integer smallestCompareWidth() {
         return 8;
     }
+
+    @Override
+    public boolean supportBulkZeroing() {
+        return true;
+    }
 }
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot.test/src/org/graalvm/compiler/hotspot/test/JVMCIVersionCheckTest.java	Mon May 06 21:50:20 2019 +0200
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+
+package org.graalvm.compiler.hotspot.test;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Properties;
+
+import org.graalvm.compiler.core.test.GraalCompilerTest;
+import org.graalvm.compiler.hotspot.JVMCIVersionCheck;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class JVMCIVersionCheckTest extends GraalCompilerTest {
+
+    @Test
+    public void test01() {
+        Properties sprops = System.getProperties();
+        Map<String, String> props = new HashMap<>(sprops.size());
+        for (String name : sprops.stringPropertyNames()) {
+            props.put(name, sprops.getProperty(name));
+        }
+
+        for (int i = 0; i < 100; i++) {
+            int minMajor = i;
+            int minMinor = 100 - i;
+            for (int j = 0; j < 100; j++) {
+                int major = j;
+                int minor = 100 - j;
+
+                boolean ok = (major > minMajor) || (major == minMajor && minor >= minMinor);
+                for (String sep : new String[]{".", "-b"}) {
+                    String javaVmVersion = String.format("prefix-jvmci-%03d%s%03d-suffix", major, sep, minor);
+                    if (ok) {
+                        JVMCIVersionCheck.check(props, minMajor, minMinor, "1.8", javaVmVersion, false);
+                    } else {
+                        try {
+                            JVMCIVersionCheck.check(props, minMajor, minMinor, "1.8", javaVmVersion, false);
+                            Assert.fail("expected to fail checking " + javaVmVersion + " against " + minMajor + "." + minMinor);
+                        } catch (InternalError e) {
+                            // pass
+                        }
+                    }
+                }
+            }
+        }
+
+        // Test handling of version components bigger than Integer.MAX_VALUE
+        for (String sep : new String[]{".", "-b"}) {
+            for (String version : new String[]{"0" + sep + Long.MAX_VALUE, Long.MAX_VALUE + sep + 0}) {
+                String javaVmVersion = String.format("prefix-jvmci-%s-suffix", version);
+                try {
+                    JVMCIVersionCheck.check(props, 0, 59, "1.8", javaVmVersion, false);
+                    Assert.fail("expected to fail checking " + javaVmVersion + " against 0.59");
+                } catch (InternalError e) {
+                    // pass
+                }
+            }
+        }
+    }
+}
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/CompilationTask.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/CompilationTask.java	Mon May 06 21:50:20 2019 +0200
@@ -32,7 +32,6 @@
 import static org.graalvm.compiler.java.BytecodeParserOptions.InlineDuringParsing;
 
 import java.io.PrintStream;
-import java.util.List;
 
 import jdk.internal.vm.compiler.collections.EconomicMap;
 import org.graalvm.compiler.api.replacements.SnippetReflectionProvider;
@@ -44,7 +43,6 @@
 import org.graalvm.compiler.debug.DebugCloseable;
 import org.graalvm.compiler.debug.DebugContext;
 import org.graalvm.compiler.debug.DebugDumpScope;
-import org.graalvm.compiler.debug.GraalError;
 import org.graalvm.compiler.debug.TimerKey;
 import org.graalvm.compiler.options.OptionKey;
 import org.graalvm.compiler.options.OptionValues;
@@ -52,7 +50,6 @@
 
 import jdk.vm.ci.code.BailoutException;
 import jdk.vm.ci.code.CodeCacheProvider;
-import jdk.vm.ci.hotspot.EventProvider;
 import jdk.vm.ci.hotspot.HotSpotCompilationRequest;
 import jdk.vm.ci.hotspot.HotSpotCompilationRequestResult;
 import jdk.vm.ci.hotspot.HotSpotInstalledCode;
@@ -60,23 +57,9 @@
 import jdk.vm.ci.hotspot.HotSpotNmethod;
 import jdk.vm.ci.hotspot.HotSpotResolvedJavaMethod;
 import jdk.vm.ci.runtime.JVMCICompiler;
-import jdk.vm.ci.services.JVMCIServiceLocator;
 
 public class CompilationTask {
 
-    private static final EventProvider eventProvider;
-
-    static {
-        List<EventProvider> providers = JVMCIServiceLocator.getProviders(EventProvider.class);
-        if (providers.size() > 1) {
-            throw new GraalError("Multiple %s providers found: %s", EventProvider.class.getName(), providers);
-        } else if (providers.isEmpty()) {
-            eventProvider = EventProvider.createEmptyEventProvider();
-        } else {
-            eventProvider = providers.get(0);
-        }
-    }
-
     private final HotSpotJVMCIRuntime jvmciRuntime;
 
     private final HotSpotGraalCompiler compiler;
@@ -94,12 +77,10 @@
     private final boolean shouldRetainLocalVariables;
 
     final class HotSpotCompilationWrapper extends CompilationWrapper<HotSpotCompilationRequestResult> {
-        private final EventProvider.CompilationEvent compilationEvent;
         CompilationResult result;
 
-        HotSpotCompilationWrapper(EventProvider.CompilationEvent compilationEvent) {
+        HotSpotCompilationWrapper() {
             super(compiler.getGraalRuntime().getOutputDirectory(), compiler.getGraalRuntime().getCompilationProblemsPerAction());
-            this.compilationEvent = compilationEvent;
         }
 
         @Override
@@ -125,13 +106,6 @@
                  */
                 return HotSpotCompilationRequestResult.failure(bailout.getMessage(), !bailout.isPermanent());
             }
-            // Log a failure event.
-            EventProvider.CompilerFailureEvent event = eventProvider.newCompilerFailureEvent();
-            if (event.shouldWrite()) {
-                event.setCompileId(getId());
-                event.setMessage(t.getMessage());
-                event.commit();
-            }
 
             /*
              * Treat random exceptions from the compiler as indicating a problem compiling this
@@ -181,14 +155,9 @@
             final CompilationPrinter printer = CompilationPrinter.begin(debug.getOptions(), compilationId, method, entryBCI);
 
             try (DebugContext.Scope s = debug.scope("Compiling", new DebugDumpScope(getIdString(), true))) {
-                // Begin the compilation event.
-                compilationEvent.begin();
                 result = compiler.compile(method, entryBCI, useProfilingInfo, shouldRetainLocalVariables, compilationId, debug);
             } catch (Throwable e) {
                 throw debug.handle(e);
-            } finally {
-                // End the compilation event.
-                compilationEvent.end();
             }
 
             if (result != null) {
@@ -322,9 +291,6 @@
         boolean isOSR = entryBCI != JVMCICompiler.INVOCATION_ENTRY_BCI;
         HotSpotResolvedJavaMethod method = getMethod();
 
-        // Log a compilation event.
-        EventProvider.CompilationEvent compilationEvent = eventProvider.newCompilationEvent();
-
         if (installAsDefault || isOSR) {
             // If there is already compiled code for this method on our level we simply return.
             // JVMCI compiles are always at the highest compile level, even in non-tiered mode so we
@@ -337,7 +303,7 @@
             }
         }
 
-        HotSpotCompilationWrapper compilation = new HotSpotCompilationWrapper(compilationEvent);
+        HotSpotCompilationWrapper compilation = new HotSpotCompilationWrapper();
         try (DebugCloseable a = CompilationTime.start(debug)) {
             return compilation.run(debug);
         } finally {
@@ -354,18 +320,6 @@
                         InstalledCodeSize.add(debug, codeSize);
                     }
                 }
-
-                // Log a compilation event.
-                if (compilationEvent.shouldWrite()) {
-                    compilationEvent.setMethod(method.format("%H.%n(%p)"));
-                    compilationEvent.setCompileId(getId());
-                    compilationEvent.setCompileLevel(config.compilationLevelFullOptimization);
-                    compilationEvent.setSucceeded(compilation.result != null && installedCode != null);
-                    compilationEvent.setIsOsr(isOSR);
-                    compilationEvent.setCodeSize(codeSize);
-                    compilationEvent.setInlinedBytes(compiledBytecodes);
-                    compilationEvent.commit();
-                }
             } catch (Throwable t) {
                 return compilation.handleException(t);
             }
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/GraalHotSpotVMConfig.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/GraalHotSpotVMConfig.java	Mon May 06 21:50:20 2019 +0200
@@ -460,6 +460,7 @@
     public final int objectMonitorRecursions = getFieldOffset("ObjectMonitor::_recursions", Integer.class, "intptr_t", -1);
     public final int objectMonitorCxq = getFieldOffset("ObjectMonitor::_cxq", Integer.class, "ObjectWaiter*", -1);
     public final int objectMonitorEntryList = getFieldOffset("ObjectMonitor::_EntryList", Integer.class, "ObjectWaiter*", -1);
+    public final int objectMonitorSucc = getFieldOffset("ObjectMonitor::_succ", Integer.class, "Thread*", -1);
 
     public final int markWordNoHashInPlace = getConstant("markOopDesc::no_hash_in_place", Integer.class);
     public final int markWordNoLockInPlace = getConstant("markOopDesc::no_lock_in_place", Integer.class);
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/JVMCIVersionCheck.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/JVMCIVersionCheck.java	Mon May 06 21:50:20 2019 +0200
@@ -39,7 +39,7 @@
  *
  * This class only depends on the JDK so that it can be used without building Graal.
  */
-class JVMCIVersionCheck {
+public final class JVMCIVersionCheck {
 
     // 0.57 introduces HotSpotJVMCIRuntime.excludeFromJVMCICompilation
     private static final int JVMCI8_MIN_MAJOR_VERSION = 0;
@@ -73,42 +73,115 @@
         }
     }
 
+    private final String javaSpecVersion;
+    private final String vmVersion;
+    private int cursor;
+    private final Map<String, String> props;
+
+    private JVMCIVersionCheck(Map<String, String> props, String javaSpecVersion, String vmVersion) {
+        this.props = props;
+        this.javaSpecVersion = javaSpecVersion;
+        this.vmVersion = vmVersion;
+    }
+
     static void check(Map<String, String> props, boolean exitOnFailure) {
+        JVMCIVersionCheck checker = new JVMCIVersionCheck(props, props.get("java.specification.version"), props.get("java.vm.version"));
+        checker.run(exitOnFailure, JVMCI8_MIN_MAJOR_VERSION, JVMCI8_MIN_MINOR_VERSION);
+    }
+
+    /**
+     * Entry point for testing.
+     */
+    public static void check(Map<String, String> props,
+                    int jvmci8MinMajorVersion,
+                    int jvmci8MinMinorVersion,
+                    String javaSpecVersion,
+                    String javaVmVersion,
+                    boolean exitOnFailure) {
+        JVMCIVersionCheck checker = new JVMCIVersionCheck(props, javaSpecVersion, javaVmVersion);
+        checker.run(exitOnFailure, jvmci8MinMajorVersion, jvmci8MinMinorVersion);
+    }
+
+    /**
+     * Parses a positive decimal number at {@link #cursor}.
+     *
+     * @return -1 if there is no positive decimal number at {@link #cursor}
+     */
+    private int parseNumber() {
+        int result = -1;
+        while (cursor < vmVersion.length()) {
+            int digit = vmVersion.charAt(cursor) - '0';
+            if (digit >= 0 && digit <= 9) {
+                if (result == -1) {
+                    result = digit;
+                } else {
+                    long r = (long) result * (long) 10;
+                    if ((int) r != r) {
+                        // Overflow
+                        return -1;
+                    }
+                    result = (int) r + digit;
+                }
+                cursor++;
+            } else {
+                break;
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Parse {@code "."} or {@code "-b"} at {@link #cursor}.
+     *
+     * @return {@code true} iff there was an expected separator at {@link #cursor}
+     */
+    private boolean parseSeparator() {
+        if (cursor < vmVersion.length()) {
+            char ch = vmVersion.charAt(cursor);
+            if (ch == '.') {
+                cursor++;
+                return true;
+            }
+            if (ch == '-') {
+                cursor++;
+                if (cursor < vmVersion.length()) {
+                    if (vmVersion.charAt(cursor) == 'b') {
+                        cursor++;
+                        return true;
+                    }
+                }
+                return false;
+            }
+        }
+        return false;
+    }
+
+    private void run(boolean exitOnFailure, int jvmci8MinMajorVersion, int jvmci8MinMinorVersion) {
         // Don't use regular expressions to minimize Graal startup time
-        String javaSpecVersion = props.get("java.specification.version");
-        String vmVersion = props.get("java.vm.version");
         if (javaSpecVersion.compareTo("1.9") < 0) {
-            int start = vmVersion.indexOf("-jvmci-");
-            if (start >= 0) {
-                start += "-jvmci-".length();
-                int end = vmVersion.indexOf('.', start);
-                if (end > 0) {
-                    int major;
-                    try {
-                        major = Integer.parseInt(vmVersion.substring(start, end));
-                    } catch (NumberFormatException e) {
-                        failVersionCheck(props, exitOnFailure, "The VM does not support the minimum JVMCI API version required by Graal.%n" +
-                                        "Cannot read JVMCI major version from java.vm.version property: %s.%n", vmVersion);
-                        return;
-                    }
-                    start = end + 1;
-                    end = start;
-                    while (end < vmVersion.length() && Character.isDigit(vmVersion.charAt(end))) {
-                        end++;
-                    }
-                    int minor;
-                    try {
-                        minor = Integer.parseInt(vmVersion.substring(start, end));
-                    } catch (NumberFormatException e) {
+            cursor = vmVersion.indexOf("-jvmci-");
+            if (cursor >= 0) {
+                cursor += "-jvmci-".length();
+                int major = parseNumber();
+                if (major == -1) {
+                    failVersionCheck(props, exitOnFailure, "The VM does not support the minimum JVMCI API version required by Graal.%n" +
+                                    "Cannot read JVMCI major version from java.vm.version property: %s.%n", vmVersion);
+                    return;
+                }
+
+                if (parseSeparator()) {
+                    int minor = parseNumber();
+                    if (minor == -1) {
                         failVersionCheck(props, exitOnFailure, "The VM does not support the minimum JVMCI API version required by Graal.%n" +
                                         "Cannot read JVMCI minor version from java.vm.version property: %s.%n", vmVersion);
                         return;
                     }
-                    if (major >= JVMCI8_MIN_MAJOR_VERSION && minor >= JVMCI8_MIN_MINOR_VERSION) {
+
+                    if (major > jvmci8MinMajorVersion || (major >= jvmci8MinMajorVersion && minor >= jvmci8MinMinorVersion)) {
                         return;
                     }
                     failVersionCheck(props, exitOnFailure, "The VM does not support the minimum JVMCI API version required by Graal: %d.%d < %d.%d.%n",
-                                    major, minor, JVMCI8_MIN_MAJOR_VERSION, JVMCI8_MIN_MINOR_VERSION);
+                                    major, minor, jvmci8MinMajorVersion, jvmci8MinMinorVersion);
                     return;
                 }
             }
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/SymbolicSnippetEncoder.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/SymbolicSnippetEncoder.java	Mon May 06 21:50:20 2019 +0200
@@ -571,7 +571,7 @@
                     try {
                         replacement = ((SymbolicJVMCIReference<?>) o).resolve(type);
                         break;
-                    } catch (NoClassDefFoundError | AssertionError e) {
+                    } catch (NoClassDefFoundError e) {
                     }
                 }
             } else if (o instanceof UnresolvedJavaType) {
@@ -579,7 +579,7 @@
                     try {
                         replacement = ((UnresolvedJavaType) o).resolve(type);
                         break;
-                    } catch (NoClassDefFoundError | AssertionError e) {
+                    } catch (NoClassDefFoundError e) {
                     }
                 }
             } else if (o instanceof UnresolvedJavaMethod) {
@@ -589,7 +589,7 @@
                     try {
                         replacement = ((UnresolvedJavaField) o).resolve(type);
                         break;
-                    } catch (NoClassDefFoundError | AssertionError e) {
+                    } catch (NoClassDefFoundError e) {
                     }
                 }
             } else if (o instanceof GraalCapability) {
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/meta/DefaultHotSpotLoweringProvider.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/meta/DefaultHotSpotLoweringProvider.java	Mon May 06 21:50:20 2019 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/HotSpotReplacementsUtil.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/HotSpotReplacementsUtil.java	Mon May 06 21:50:20 2019 +0200
@@ -516,6 +516,11 @@
         return config.objectMonitorEntryList;
     }
 
+    @Fold
+    public static int objectMonitorSuccOffset(@InjectedParameter GraalHotSpotVMConfig config) {
+        return config.objectMonitorSucc;
+    }
+
     /**
      * Mask for a biasable, locked or unlocked mark word.
      *
@@ -685,6 +690,8 @@
 
     public static final LocationIdentity OBJECT_MONITOR_ENTRY_LIST_LOCATION = NamedLocationIdentity.mutable("ObjectMonitor::_EntryList");
 
+    public static final LocationIdentity OBJECT_MONITOR_SUCC_LOCATION = NamedLocationIdentity.mutable("ObjectMonitor::_succ");
+
     @Fold
     public static int lockDisplacedMarkOffset(@InjectedParameter GraalHotSpotVMConfig config) {
         return config.basicLockDisplacedHeaderOffset;
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/MonitorSnippets.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/MonitorSnippets.java	Mon May 06 21:50:20 2019 +0200
@@ -25,6 +25,7 @@
 package org.graalvm.compiler.hotspot.replacements;
 
 import static jdk.vm.ci.code.MemoryBarriers.LOAD_STORE;
+import static jdk.vm.ci.code.MemoryBarriers.STORE_LOAD;
 import static jdk.vm.ci.code.MemoryBarriers.STORE_STORE;
 import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfig.INJECTED_OPTIONVALUES;
 import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfig.INJECTED_VMCONFIG;
@@ -38,6 +39,7 @@
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.OBJECT_MONITOR_ENTRY_LIST_LOCATION;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.OBJECT_MONITOR_OWNER_LOCATION;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.OBJECT_MONITOR_RECURSION_LOCATION;
+import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.OBJECT_MONITOR_SUCC_LOCATION;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.PROTOTYPE_MARK_WORD_LOCATION;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.ageMaskInPlace;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.biasedLockMaskInPlace;
@@ -51,6 +53,7 @@
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.objectMonitorEntryListOffset;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.objectMonitorOwnerOffset;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.objectMonitorRecursionsOffset;
+import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.objectMonitorSuccOffset;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.pageSize;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.prototypeMarkWordOffset;
 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.registerAsWord;
@@ -574,6 +577,32 @@
                     traceObject(trace, "-lock{inflated:simple}", object, false);
                     counters.unlockInflatedSimple.inc();
                     return true;
+                } else {
+                    int succOffset = objectMonitorSuccOffset(INJECTED_VMCONFIG);
+                    Word succ = monitor.readWord(succOffset, OBJECT_MONITOR_SUCC_LOCATION);
+                    if (probability(FREQUENT_PROBABILITY, succ.isNonNull())) {
+                        // There may be a thread spinning on this monitor. Temporarily setting
+                        // the monitor owner to null, and hope that the other thread will grab it.
+                        monitor.writeWord(ownerOffset, zero());
+                        memoryBarrier(STORE_STORE | STORE_LOAD);
+                        succ = monitor.readWord(succOffset, OBJECT_MONITOR_SUCC_LOCATION);
+                        if (probability(NOT_FREQUENT_PROBABILITY, succ.isNonNull())) {
+                            // We manage to release the monitor before the other running thread even
+                            // notices.
+                            traceObject(trace, "-lock{inflated:transfer}", object, false);
+                            counters.unlockInflatedTransfer.inc();
+                            return true;
+                        } else {
+                            // Either the monitor is grabbed by a spinning thread, or the spinning
+                            // thread parks. Now we attempt to reset the owner of the monitor.
+                            if (probability(FREQUENT_PROBABILITY, !monitor.logicCompareAndSwapWord(ownerOffset, zero(), thread, OBJECT_MONITOR_OWNER_LOCATION))) {
+                                // The monitor is stolen.
+                                traceObject(trace, "-lock{inflated:transfer}", object, false);
+                                counters.unlockInflatedTransfer.inc();
+                                return true;
+                            }
+                        }
+                    }
                 }
             }
             counters.unlockStubInflated.inc();
@@ -692,6 +721,7 @@
         public final SnippetCounter unlockStub;
         public final SnippetCounter unlockStubInflated;
         public final SnippetCounter unlockInflatedSimple;
+        public final SnippetCounter unlockInflatedTransfer;
 
         public Counters(SnippetCounter.Group.Factory factory) {
             SnippetCounter.Group enter = factory.createSnippetCounterGroup("MonitorEnters");
@@ -716,6 +746,7 @@
             unlockStub = new SnippetCounter(exit, "unlock{stub}", "stub-unlocked an object");
             unlockStubInflated = new SnippetCounter(exit, "unlock{stub:inflated}", "stub-unlocked an object with inflated monitor");
             unlockInflatedSimple = new SnippetCounter(exit, "unlock{inflated}", "unlocked an object monitor");
+            unlockInflatedTransfer = new SnippetCounter(exit, "unlock{inflated:transfer}", "unlocked an object monitor in the presence of ObjectMonitor::_succ");
         }
     }
 
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/NewObjectSnippets.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/NewObjectSnippets.java	Mon May 06 21:50:20 2019 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -27,6 +27,7 @@
 import static jdk.vm.ci.meta.DeoptimizationAction.None;
 import static jdk.vm.ci.meta.DeoptimizationReason.RuntimeConstraint;
 import static org.graalvm.compiler.core.common.GraalOptions.GeneratePIC;
+import static org.graalvm.compiler.core.common.GraalOptions.MinimalBulkZeroingSize;
 import static org.graalvm.compiler.core.common.calc.UnsignedMath.belowThan;
 import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfigBase.INJECTED_OPTIONVALUES;
 import static org.graalvm.compiler.hotspot.GraalHotSpotVMConfigBase.INJECTED_VMCONFIG;
@@ -130,6 +131,7 @@
 import org.graalvm.compiler.replacements.SnippetTemplate.SnippetInfo;
 import org.graalvm.compiler.replacements.Snippets;
 import org.graalvm.compiler.replacements.nodes.ExplodeLoopNode;
+import org.graalvm.compiler.replacements.nodes.ZeroMemoryNode;
 import org.graalvm.compiler.word.Word;
 import jdk.internal.vm.compiler.word.LocationIdentity;
 import jdk.internal.vm.compiler.word.WordFactory;
@@ -311,21 +313,39 @@
     public static final int MAX_ARRAY_FAST_PATH_ALLOCATION_LENGTH = 0x00FFFFFF;
 
     @Snippet
-    public static Object allocatePrimitiveArrayPIC(KlassPointer hub, int length, Word prototypeMarkWord, @ConstantParameter int headerSize, @ConstantParameter int log2ElementSize,
-                    @ConstantParameter boolean fillContents, @ConstantParameter Register threadRegister, @ConstantParameter boolean maybeUnroll, @ConstantParameter String typeContext,
+    public static Object allocatePrimitiveArrayPIC(KlassPointer hub,
+                    int length,
+                    Word prototypeMarkWord,
+                    @ConstantParameter int headerSize,
+                    @ConstantParameter int log2ElementSize,
+                    @ConstantParameter boolean fillContents,
+                    @ConstantParameter Register threadRegister,
+                    @ConstantParameter boolean maybeUnroll,
+                    @ConstantParameter String typeContext,
+                    @ConstantParameter boolean useBulkZeroing,
                     @ConstantParameter Counters counters) {
         // Primitive array types are eagerly pre-resolved. We can use a floating load.
         KlassPointer picHub = LoadConstantIndirectlyNode.loadKlass(hub);
-        return allocateArrayImpl(picHub, length, prototypeMarkWord, headerSize, log2ElementSize, fillContents, threadRegister, maybeUnroll, typeContext, counters);
+        return allocateArrayImpl(picHub, length, prototypeMarkWord, headerSize, log2ElementSize, fillContents,
+                        threadRegister, maybeUnroll, typeContext, useBulkZeroing, counters);
     }
 
     @Snippet
-    public static Object allocateArrayPIC(KlassPointer hub, int length, Word prototypeMarkWord, @ConstantParameter int headerSize, @ConstantParameter int log2ElementSize,
-                    @ConstantParameter boolean fillContents, @ConstantParameter Register threadRegister, @ConstantParameter boolean maybeUnroll, @ConstantParameter String typeContext,
+    public static Object allocateArrayPIC(KlassPointer hub,
+                    int length,
+                    Word prototypeMarkWord,
+                    @ConstantParameter int headerSize,
+                    @ConstantParameter int log2ElementSize,
+                    @ConstantParameter boolean fillContents,
+                    @ConstantParameter Register threadRegister,
+                    @ConstantParameter boolean maybeUnroll,
+                    @ConstantParameter String typeContext,
+                    @ConstantParameter boolean useBulkZeroing,
                     @ConstantParameter Counters counters) {
         // Array type would be resolved by dominating resolution.
         KlassPointer picHub = LoadConstantIndirectlyFixedNode.loadKlass(hub);
-        return allocateArrayImpl(picHub, length, prototypeMarkWord, headerSize, log2ElementSize, fillContents, threadRegister, maybeUnroll, typeContext, counters);
+        return allocateArrayImpl(picHub, length, prototypeMarkWord, headerSize, log2ElementSize, fillContents,
+                        threadRegister, maybeUnroll, typeContext, useBulkZeroing, counters);
     }
 
     @Snippet
@@ -338,6 +358,7 @@
                     @ConstantParameter Register threadRegister,
                     @ConstantParameter boolean maybeUnroll,
                     @ConstantParameter String typeContext,
+                    @ConstantParameter boolean useBulkZeroing,
                     @ConstantParameter Counters counters) {
         Object result = allocateArrayImpl(hub,
                         length,
@@ -348,7 +369,7 @@
                         threadRegister,
                         maybeUnroll,
                         typeContext,
-
+                        useBulkZeroing,
                         counters);
         return piArrayCastToSnippetReplaceeStamp(verifyOop(result), length);
     }
@@ -363,7 +384,7 @@
     }
 
     private static Object allocateArrayImpl(KlassPointer hub, int length, Word prototypeMarkWord, int headerSize, int log2ElementSize, boolean fillContents, Register threadRegister,
-                    boolean maybeUnroll, String typeContext, Counters counters) {
+                    boolean maybeUnroll, String typeContext, boolean useBulkZeroing, Counters counters) {
         Object result;
         long allocationSize = arrayAllocationSize(length, headerSize, log2ElementSize);
         Word thread = registerAsWord(threadRegister);
@@ -378,7 +399,7 @@
             if (theCounters != null && theCounters.arrayLoopInit != null) {
                 theCounters.arrayLoopInit.inc();
             }
-            result = formatArray(hub, allocationSize, length, headerSize, top, prototypeMarkWord, fillContents, maybeUnroll, counters);
+            result = formatArray(hub, allocationSize, length, headerSize, top, prototypeMarkWord, fillContents, maybeUnroll, useBulkZeroing, counters);
         } else {
             result = newArrayStub(hub, length);
         }
@@ -435,15 +456,23 @@
     public static native Object dynamicNewInstanceOrNull(@ConstantNodeParameter ForeignCallDescriptor descriptor, Class<?> elementType);
 
     @Snippet
-    public static Object allocateArrayDynamic(Class<?> elementType, Class<?> voidClass, int length, @ConstantParameter boolean fillContents, @ConstantParameter Register threadRegister,
-                    @ConstantParameter JavaKind knownElementKind, @ConstantParameter int knownLayoutHelper, Word prototypeMarkWord,
+    public static Object allocateArrayDynamic(Class<?> elementType,
+                    Class<?> voidClass,
+                    int length,
+                    @ConstantParameter boolean fillContents,
+                    @ConstantParameter Register threadRegister,
+                    @ConstantParameter JavaKind knownElementKind,
+                    @ConstantParameter int knownLayoutHelper,
+                    @ConstantParameter boolean useBulkZeroing,
+                    Word prototypeMarkWord,
                     @ConstantParameter Counters counters) {
-        Object result = allocateArrayDynamicImpl(elementType, voidClass, length, fillContents, threadRegister, knownElementKind, knownLayoutHelper, prototypeMarkWord, counters);
+        Object result = allocateArrayDynamicImpl(elementType, voidClass, length, fillContents, threadRegister, knownElementKind,
+                        knownLayoutHelper, useBulkZeroing, prototypeMarkWord, counters);
         return result;
     }
 
     private static Object allocateArrayDynamicImpl(Class<?> elementType, Class<?> voidClass, int length, boolean fillContents, Register threadRegister, JavaKind knownElementKind,
-                    int knownLayoutHelper, Word prototypeMarkWord, Counters counters) {
+                    int knownLayoutHelper, boolean useBulkZeroing, Word prototypeMarkWord, Counters counters) {
         /*
          * We only need the dynamic check for void when we have no static information from
          * knownElementKind.
@@ -485,7 +514,8 @@
         int headerSize = (layoutHelper >> layoutHelperHeaderSizeShift(INJECTED_VMCONFIG)) & layoutHelperHeaderSizeMask(INJECTED_VMCONFIG);
         int log2ElementSize = (layoutHelper >> layoutHelperLog2ElementSizeShift(INJECTED_VMCONFIG)) & layoutHelperLog2ElementSizeMask(INJECTED_VMCONFIG);
 
-        Object result = allocateArrayImpl(nonNullKlass, length, prototypeMarkWord, headerSize, log2ElementSize, fillContents, threadRegister, false, "dynamic type", counters);
+        Object result = allocateArrayImpl(nonNullKlass, length, prototypeMarkWord, headerSize, log2ElementSize, fillContents,
+                        threadRegister, false, "dynamic type", useBulkZeroing, counters);
         return piArrayCastToSnippetReplaceeStamp(verifyOop(result), length);
     }
 
@@ -538,12 +568,15 @@
      * @param constantSize is {@code size} known to be constant in the snippet
      * @param startOffset offset to begin zeroing. May not be word aligned.
      * @param manualUnroll maximally unroll zeroing
+     * @param useBulkZeroing apply bulk zeroing
      */
-    private static void zeroMemory(long size, Word memory, boolean constantSize, int startOffset, boolean manualUnroll, Counters counters) {
-        fillMemory(0, size, memory, constantSize, startOffset, manualUnroll, counters);
+    private static void zeroMemory(long size, Word memory, boolean constantSize, int startOffset, boolean manualUnroll,
+                    boolean useBulkZeroing, Counters counters) {
+        fillMemory(0, size, memory, constantSize, startOffset, manualUnroll, useBulkZeroing, counters);
     }
 
-    private static void fillMemory(long value, long size, Word memory, boolean constantSize, int startOffset, boolean manualUnroll, Counters counters) {
+    private static void fillMemory(long value, long size, Word memory, boolean constantSize, int startOffset, boolean manualUnroll,
+                    boolean useBulkZeroing, Counters counters) {
         ReplacementsUtil.runtimeAssert((size & 0x7) == 0, "unaligned object size");
         int offset = startOffset;
         if ((offset & 0x7) != 0) {
@@ -571,22 +604,35 @@
         } else {
             // Use Word instead of int to avoid extension to long in generated code
             Word off = WordFactory.signed(offset);
-            if (constantSize && ((size - offset) / 8) <= MAX_UNROLLED_OBJECT_ZEROING_STORES) {
-                if (theCounters != null && theCounters.instanceSeqInit != null) {
-                    theCounters.instanceSeqInit.inc();
+            if (useBulkZeroing && probability(SLOW_PATH_PROBABILITY, size >= getMinimalBulkZeroingSize(INJECTED_OPTIONVALUES))) {
+                if (theCounters != null && theCounters.instanceBulkInit != null) {
+                    theCounters.instanceBulkInit.inc();
                 }
-                explodeLoop();
+                ZeroMemoryNode.zero(memory.add(off), size - offset, LocationIdentity.init());
             } else {
-                if (theCounters != null && theCounters.instanceLoopInit != null) {
-                    theCounters.instanceLoopInit.inc();
+                if (constantSize && ((size - offset) / 8) <= MAX_UNROLLED_OBJECT_ZEROING_STORES) {
+                    if (theCounters != null && theCounters.instanceSeqInit != null) {
+                        theCounters.instanceSeqInit.inc();
+                    }
+                    explodeLoop();
+                } else {
+                    if (theCounters != null && theCounters.instanceLoopInit != null) {
+                        theCounters.instanceLoopInit.inc();
+                    }
                 }
-            }
-            for (; off.rawValue() < size; off = off.add(8)) {
-                memory.initializeLong(off, value, LocationIdentity.init());
+                for (; off.rawValue() < size; off = off.add(8)) {
+                    memory.initializeLong(off, value, LocationIdentity.init());
+                }
+
             }
         }
     }
 
+    @Fold
+    static int getMinimalBulkZeroingSize(@InjectedParameter OptionValues optionValues) {
+        return MinimalBulkZeroingSize.getValue(optionValues);
+    }
+
     /**
      * Fill uninitialized memory with garbage value in a newly allocated object, unrolling as
      * necessary and ensuring that stores are aligned.
@@ -598,7 +644,7 @@
      * @param manualUnroll maximally unroll zeroing
      */
     private static void fillWithGarbage(long size, Word memory, boolean constantSize, int startOffset, boolean manualUnroll, Counters counters) {
-        fillMemory(0xfefefefefefefefeL, size, memory, constantSize, startOffset, manualUnroll, counters);
+        fillMemory(0xfefefefefefefefeL, size, memory, constantSize, startOffset, manualUnroll, false, counters);
     }
 
     /**
@@ -608,7 +654,7 @@
         Word prototypeMarkWord = useBiasedLocking(INJECTED_VMCONFIG) ? hub.readWord(prototypeMarkWordOffset(INJECTED_VMCONFIG), PROTOTYPE_MARK_WORD_LOCATION) : compileTimePrototypeMarkWord;
         initializeObjectHeader(memory, prototypeMarkWord, hub);
         if (fillContents) {
-            zeroMemory(size, memory, constantSize, instanceHeaderSize(INJECTED_VMCONFIG), false, counters);
+            zeroMemory(size, memory, constantSize, instanceHeaderSize(INJECTED_VMCONFIG), false, false, counters);
         } else if (REPLACEMENTS_ASSERTIONS_ENABLED) {
             fillWithGarbage(size, memory, constantSize, instanceHeaderSize(INJECTED_VMCONFIG), false, counters);
         }
@@ -632,7 +678,7 @@
      * Formats some allocated memory with an object header and zeroes out the rest.
      */
     private static Object formatArray(KlassPointer hub, long allocationSize, int length, int headerSize, Word memory, Word prototypeMarkWord, boolean fillContents, boolean maybeUnroll,
-                    Counters counters) {
+                    boolean useBulkZeroing, Counters counters) {
         memory.writeInt(arrayLengthOffset(INJECTED_VMCONFIG), length, LocationIdentity.init());
         /*
          * store hub last as the concurrent garbage collectors assume length is valid if hub field
@@ -640,7 +686,7 @@
          */
         initializeObjectHeader(memory, prototypeMarkWord, hub);
         if (fillContents) {
-            zeroMemory(allocationSize, memory, false, headerSize, maybeUnroll, counters);
+            zeroMemory(allocationSize, memory, false, headerSize, maybeUnroll, useBulkZeroing, counters);
         } else if (REPLACEMENTS_ASSERTIONS_ENABLED) {
             fillWithGarbage(allocationSize, memory, false, headerSize, maybeUnroll, counters);
         }
@@ -654,12 +700,14 @@
             Group newArray = factory.createSnippetCounterGroup("NewArray");
             instanceSeqInit = new SnippetCounter(newInstance, "tlabSeqInit", "TLAB alloc with unrolled zeroing");
             instanceLoopInit = new SnippetCounter(newInstance, "tlabLoopInit", "TLAB alloc with zeroing in a loop");
+            instanceBulkInit = new SnippetCounter(newArray, "tlabBulkInit", "TLAB alloc with bulk zeroing");
             arrayLoopInit = new SnippetCounter(newArray, "tlabLoopInit", "TLAB alloc with zeroing in a loop");
             stub = new SnippetCounter(newInstance, "stub", "alloc and zeroing via stub");
         }
 
         final SnippetCounter instanceSeqInit;
         final SnippetCounter instanceLoopInit;
+        final SnippetCounter instanceBulkInit;
         final SnippetCounter arrayLoopInit;
         final SnippetCounter stub;
     }
@@ -753,6 +801,7 @@
             args.addConst("threadRegister", registers.getThreadRegister());
             args.addConst("maybeUnroll", length.isConstant());
             args.addConst("typeContext", ProfileAllocations.getValue(localOptions) ? arrayType.toJavaName(false) : "");
+            args.addConst("useBulkZeroing", tool.getLowerer().supportBulkZeroing());
             args.addConst("counters", counters);
             SnippetTemplate template = template(newArrayNode, args);
             graph.getDebug().log("Lowering allocateArray in %s: node=%s, template=%s, arguments=%s", graph, newArrayNode, template, args);
@@ -775,7 +824,7 @@
 
         public void lower(DynamicNewArrayNode newArrayNode, HotSpotRegistersProvider registers, LoweringTool tool) {
             StructuredGraph graph = newArrayNode.graph();
-            Arguments args = new Arguments(allocateArrayDynamic, newArrayNode.graph().getGuardsStage(), tool.getLoweringStage());
+            Arguments args = new Arguments(allocateArrayDynamic, graph.getGuardsStage(), tool.getLoweringStage());
             args.add("elementType", newArrayNode.getElementType());
             ValueNode voidClass = newArrayNode.getVoidClass();
             assert voidClass != null;
@@ -794,6 +843,7 @@
             } else {
                 args.addConst("knownLayoutHelper", 0);
             }
+            args.addConst("useBulkZeroing", tool.getLowerer().supportBulkZeroing());
             args.add("prototypeMarkWord", lookupArrayClass(tool, JavaKind.Object).prototypeMarkWord());
             args.addConst("counters", counters);
             SnippetTemplate template = template(newArrayNode, args);
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.java/src/org/graalvm/compiler/java/BciBlockMapping.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.java/src/org/graalvm/compiler/java/BciBlockMapping.java	Mon May 06 21:50:20 2019 +0200
@@ -93,6 +93,7 @@
 import static org.graalvm.compiler.bytecode.Bytecodes.TABLESWITCH;
 import static org.graalvm.compiler.core.common.GraalOptions.SupportJsrBytecodes;
 
+import java.util.ArrayDeque;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -117,7 +118,7 @@
 
 /**
  * Builds a mapping between bytecodes and basic blocks and builds a conservative control flow graph
- * (CFG). It makes one linear passes over the bytecodes to build the CFG where it detects block
+ * (CFG). It makes one linear pass over the bytecodes to build the CFG where it detects block
  * headers and connects them.
  * <p>
  * It also creates exception dispatch blocks for exception handling. These blocks are between a
@@ -477,6 +478,18 @@
         }
     }
 
+    private static final class TraversalStep {
+        private BciBlock block;
+        private int currentSuccessorIndex;
+        private long loops;
+
+        private TraversalStep(BciBlock block) {
+            this.block = block;
+            this.currentSuccessorIndex = 0;
+            this.loops = 0;
+        }
+    }
+
     /**
      * The blocks found in this method, in reverse postorder.
      */
@@ -857,7 +870,7 @@
                 b.visited = false;
             }
 
-            long loop = fixLoopBits(blockMap, blockMap[0]);
+            long loop = fixLoopBits(blockMap[0]);
 
             if (loop != 0) {
                 // There is a path from a loop end to the method entry that does not pass the loop
@@ -1029,78 +1042,107 @@
     }
 
     /**
-     * Depth-first traversal of the control flow graph. The flag {@linkplain BciBlock#visited} is
-     * used to visit every block only once. The flag {@linkplain BciBlock#active} is used to detect
-     * cycles (backward edges).
+     * Non-recursive depth-first traversal of the control flow graph. The flag
+     * {@linkplain BciBlock#visited} is used to visit every block only once. The flag
+     * {@linkplain BciBlock#active} is used to detect cycles (backward edges)
      */
-    private long computeBlockOrder(BciBlock block) {
-        if (block.visited) {
-            if (block.active) {
-                // Reached block via backward branch.
-                makeLoopHeader(block);
-                // Return cached loop information for this block.
-                return block.loops;
-            } else if (block.isLoopHeader) {
-                return block.loops & ~(1L << block.loopId);
+    private long computeBlockOrder(BciBlock initialBlock) {
+        ArrayDeque<TraversalStep> workStack = new ArrayDeque<>();
+        workStack.push(new TraversalStep(initialBlock));
+        while (true) {
+            TraversalStep step = workStack.peek();
+            BciBlock block = step.block;
+            if (step.currentSuccessorIndex == 0) {
+                block.visited = true;
+                block.active = true;
             } else {
-                return block.loops;
+                BciBlock successor = block.getSuccessor(step.currentSuccessorIndex - 1);
+                if (successor.active) {
+                    // Reached block via backward branch.
+                    step.loops |= (1L << successor.loopId);
+                }
+            }
+            if (step.currentSuccessorIndex < block.successors.size()) {
+                BciBlock successor = block.getSuccessors().get(step.currentSuccessorIndex);
+                if (successor.visited) {
+                    if (successor.active) {
+                        // Reached block via backward branch.
+                        makeLoopHeader(successor);
+                        step.loops |= successor.loops;
+                    } else if (successor.isLoopHeader) {
+                        step.loops |= successor.loops & ~(1L << successor.loopId);
+                    } else {
+                        step.loops |= successor.loops;
+                    }
+                } else {
+                    workStack.push(new TraversalStep(successor));
+                }
+                step.currentSuccessorIndex++;
+            } else {
+                // We processed all the successors of this block.
+                block.loops = step.loops;
+                debug.log("computeBlockOrder(%s) -> %x", block, block.loops);
+
+                if (block.isLoopHeader) {
+                    step.loops &= ~(1L << block.loopId);
+                }
+
+                block.active = false;
+                blocksNotYetAssignedId--;
+                blocks[blocksNotYetAssignedId] = block;
+
+                workStack.pop();
+                if (!workStack.isEmpty()) {
+                    workStack.peek().loops |= step.loops;
+                } else {
+                    return step.loops;
+                }
             }
         }
+    }
 
-        block.visited = true;
-        block.active = true;
+    private long fixLoopBits(BciBlock initialBlock) {
+        ArrayDeque<TraversalStep> workStack = new ArrayDeque<>();
+        workStack.push(new TraversalStep(initialBlock));
+        while (true) {
+            TraversalStep step = workStack.peek();
+            BciBlock block = step.block;
+            if (step.currentSuccessorIndex == 0) {
+                block.visited = true;
+                step.loops = block.loops;
+            }
+            if (step.currentSuccessorIndex < block.getSuccessors().size()) {
+                BciBlock successor = block.getSuccessors().get(step.currentSuccessorIndex);
+                if (successor.visited) {
+                    // Return cached loop information for this block.
+                    if (successor.isLoopHeader) {
+                        step.loops |= successor.loops & ~(1L << successor.loopId);
+                    } else {
+                        step.loops |= successor.loops;
+                    }
+                } else {
+                    workStack.push(new TraversalStep(successor));
+                }
+                step.currentSuccessorIndex++;
+            } else {
+                if (block.loops != step.loops) {
+                    loopChanges = true;
+                    block.loops = step.loops;
+                    debug.log("fixLoopBits0(%s) -> %x", block, block.loops);
+                }
 
-        long loops = 0;
-        for (BciBlock successor : block.getSuccessors()) {
-            // Recursively process successors.
-            loops |= computeBlockOrder(successor);
-            if (successor.active) {
-                // Reached block via backward branch.
-                loops |= (1L << successor.loopId);
+                if (block.isLoopHeader) {
+                    step.loops &= ~(1L << block.loopId);
+                }
+
+                workStack.pop();
+                if (!workStack.isEmpty()) {
+                    workStack.peek().loops |= step.loops;
+                } else {
+                    return step.loops;
+                }
             }
         }
-
-        block.loops = loops;
-        debug.log("computeBlockOrder(%s) -> %x", block, block.loops);
-
-        if (block.isLoopHeader) {
-            loops &= ~(1L << block.loopId);
-        }
-
-        block.active = false;
-        blocksNotYetAssignedId--;
-        blocks[blocksNotYetAssignedId] = block;
-
-        return loops;
-    }
-
-    private long fixLoopBits(BciBlock[] blockMap, BciBlock block) {
-        if (block.visited) {
-            // Return cached loop information for this block.
-            if (block.isLoopHeader) {
-                return block.loops & ~(1L << block.loopId);
-            } else {
-                return block.loops;
-            }
-        }
-
-        block.visited = true;
-        long loops = block.loops;
-        for (BciBlock successor : block.getSuccessors()) {
-            // Recursively process successors.
-            loops |= fixLoopBits(blockMap, successor);
-        }
-        if (block.loops != loops) {
-            loopChanges = true;
-            block.loops = loops;
-            debug.log("fixLoopBits0(%s) -> %x", block, block.loops);
-        }
-
-        if (block.isLoopHeader) {
-            loops &= ~(1L << block.loopId);
-        }
-
-        return loops;
     }
 
     public static BciBlockMapping create(BytecodeStream stream, Bytecode code, OptionValues options, DebugContext debug) {
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir.aarch64/src/org/graalvm/compiler/lir/aarch64/AArch64Move.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir.aarch64/src/org/graalvm/compiler/lir/aarch64/AArch64Move.java	Mon May 06 21:50:20 2019 +0200
@@ -710,4 +710,71 @@
         }
     }
 
+    private abstract static class ZeroNullConversionOp extends AArch64LIRInstruction {
+        @Def({REG, HINT}) protected AllocatableValue result;
+        @Use({REG}) protected AllocatableValue input;
+
+        protected ZeroNullConversionOp(LIRInstructionClass<? extends ZeroNullConversionOp> type, AllocatableValue result, AllocatableValue input) {
+            super(type);
+            this.result = result;
+            this.input = input;
+        }
+
+        @Override
+        public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) {
+            Register nullRegister = crb.nullRegister;
+            if (!nullRegister.equals(Register.None)) {
+                emitConversion(asRegister(result), asRegister(input), nullRegister, masm);
+            }
+        }
+
+        protected abstract void emitConversion(Register resultRegister, Register inputRegister, Register nullRegister, AArch64MacroAssembler masm);
+    }
+
+    public static class ConvertNullToZeroOp extends ZeroNullConversionOp {
+        public static final LIRInstructionClass<ConvertNullToZeroOp> TYPE = LIRInstructionClass.create(ConvertNullToZeroOp.class);
+
+        public ConvertNullToZeroOp(AllocatableValue result, AllocatableValue input) {
+            super(TYPE, result, input);
+        }
+
+        @Override
+        protected final void emitConversion(Register resultRegister, Register inputRegister, Register nullRegister, AArch64MacroAssembler masm) {
+            if (inputRegister.equals(resultRegister)) {
+                masm.subs(64, inputRegister, inputRegister, nullRegister);
+                Label done = new Label();
+                masm.branchConditionally(AArch64Assembler.ConditionFlag.EQ, done);
+                masm.add(64, inputRegister, inputRegister, nullRegister);
+                masm.bind(done);
+            } else {
+                masm.subs(64, resultRegister, resultRegister, resultRegister);
+                masm.cmp(64, inputRegister, nullRegister);
+                Label done = new Label();
+                masm.branchConditionally(AArch64Assembler.ConditionFlag.EQ, done);
+                masm.movx(resultRegister, inputRegister);
+                masm.bind(done);
+            }
+        }
+    }
+
+    public static class ConvertZeroToNullOp extends ZeroNullConversionOp {
+        public static final LIRInstructionClass<ConvertZeroToNullOp> TYPE = LIRInstructionClass.create(ConvertZeroToNullOp.class);
+
+        public ConvertZeroToNullOp(AllocatableValue result, AllocatableValue input) {
+            super(TYPE, result, input);
+        }
+
+        @Override
+        protected final void emitConversion(Register resultRegister, Register inputRegister, Register nullRegister, AArch64MacroAssembler masm) {
+            if (!inputRegister.equals(resultRegister)) {
+                masm.movx(resultRegister, inputRegister);
+            }
+            Label done = new Label();
+            masm.ands(64, zr, inputRegister, inputRegister);
+            masm.branchConditionally(AArch64Assembler.ConditionFlag.NE, done);
+            masm.movx(resultRegister, nullRegister);
+            masm.bind(done);
+        }
+    }
+
 }
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir.amd64/src/org/graalvm/compiler/lir/amd64/AMD64ZeroMemoryOp.java	Mon May 06 21:50:20 2019 +0200
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+
+package org.graalvm.compiler.lir.amd64;
+
+import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.COMPOSITE;
+import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;
+
+import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;
+import org.graalvm.compiler.core.common.LIRKind;
+import org.graalvm.compiler.lir.LIRInstructionClass;
+import org.graalvm.compiler.lir.Opcode;
+import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
+
+import jdk.vm.ci.amd64.AMD64;
+import jdk.vm.ci.amd64.AMD64Kind;
+import jdk.vm.ci.code.RegisterValue;
+import jdk.vm.ci.meta.Value;
+
+/**
+ * Zeros a chunk of memory using rep stosb.
+ */
+@Opcode("ZERO_MEMORY")
+public final class AMD64ZeroMemoryOp extends AMD64LIRInstruction {
+
+    public static final LIRInstructionClass<AMD64ZeroMemoryOp> TYPE = LIRInstructionClass.create(AMD64ZeroMemoryOp.class);
+
+    @Use({COMPOSITE}) protected AMD64AddressValue pointer;
+    @Use({REG}) protected RegisterValue length;
+
+    @Temp protected Value pointerTemp;
+    @Temp protected Value valueTemp;
+    @Temp protected Value lengthTemp;
+
+    public AMD64ZeroMemoryOp(AMD64AddressValue pointer, RegisterValue length) {
+        super(TYPE);
+        this.pointer = pointer;
+        this.length = length;
+
+        this.pointerTemp = AMD64.rdi.asValue(LIRKind.value(AMD64Kind.QWORD));
+        this.valueTemp = AMD64.rax.asValue(LIRKind.value(AMD64Kind.QWORD));
+        this.lengthTemp = AMD64.rcx.asValue(LIRKind.value(AMD64Kind.QWORD));
+    }
+
+    @Override
+    public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
+        assert AMD64.rcx.equals(length.getRegister());
+        masm.leaq(AMD64.rdi, pointer.toAddress());
+        masm.xorq(AMD64.rax, AMD64.rax);
+        masm.repStosb();
+    }
+}
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir/src/org/graalvm/compiler/lir/gen/ArithmeticLIRGeneratorTool.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir/src/org/graalvm/compiler/lir/gen/ArithmeticLIRGeneratorTool.java	Mon May 06 21:50:20 2019 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -132,4 +132,8 @@
         throw GraalError.unimplemented("No specialized implementation available");
     }
 
+    @SuppressWarnings("unused")
+    default void emitZeroMemory(Value address, Value length) {
+        throw GraalError.unimplemented("Bulk zeroing is not supported on this platform");
+    }
 }
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes.test/src/org/graalvm/compiler/nodes/test/PrimitiveStampBoundaryTest.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes.test/src/org/graalvm/compiler/nodes/test/PrimitiveStampBoundaryTest.java	Mon May 06 21:50:20 2019 +0200
@@ -83,7 +83,7 @@
     }
 
     static double[] doubleBoundaryValues = {Double.NEGATIVE_INFINITY, Double.MIN_VALUE, Float.NEGATIVE_INFINITY, Float.MIN_VALUE,
-                    Long.MIN_VALUE, Long.MIN_VALUE + 1, Integer.MIN_VALUE, Integer.MIN_VALUE + 1, -1, 0, 1,
+                    Long.MIN_VALUE, Long.MIN_VALUE + 1, Integer.MIN_VALUE, Integer.MIN_VALUE + 1, -1, -0.0, +0.0, 1,
                     Integer.MAX_VALUE - 1, Integer.MAX_VALUE, Long.MAX_VALUE - 1, Long.MAX_VALUE,
                     Float.MAX_VALUE, Float.POSITIVE_INFINITY, Double.MAX_VALUE, Double.POSITIVE_INFINITY};
 
@@ -171,11 +171,24 @@
                 checkConvertOperation(op, op.foldStamp(stamp), upper);
             }
         }
+
+    }
+
+    static void shouldConstantFold(boolean b, Stamp folded, Object o, Stamp s1) {
+        assertTrue(b || (folded instanceof FloatStamp && ((FloatStamp) folded).contains(0.0)), "should constant fold %s %s %s", o, s1, folded);
+    }
+
+    private static boolean constantFloatStampMayIncludeNegativeZero(Stamp s) {
+        if (s instanceof FloatStamp) {
+            FloatStamp f = (FloatStamp) s;
+            return Double.compare(f.lowerBound(), f.upperBound()) == 0 && f.isNonNaN();
+        }
+        return false;
     }
 
     private static void checkConvertOperation(ArithmeticOpTable.FloatConvertOp op, Stamp result, Stamp v1stamp) {
         Stamp folded = op.foldStamp(v1stamp);
-        assertTrue(folded.isEmpty() || folded.asConstant() != null, "should constant fold %s %s %s", op, v1stamp, folded);
+        shouldConstantFold(folded.isEmpty() || folded.asConstant() != null, folded, op, v1stamp);
         assertTrue(result.meet(folded).equals(result), "result out of range %s %s %s %s %s", op, v1stamp, folded, result, result.meet(folded));
     }
 
@@ -216,6 +229,9 @@
     }
 
     private static void checkBinaryOperation(ArithmeticOpTable.BinaryOp<?> op, Stamp result, Stamp v1stamp, Stamp v2stamp) {
+        if (constantFloatStampMayIncludeNegativeZero(v1stamp) || constantFloatStampMayIncludeNegativeZero(v2stamp)) {
+            return;
+        }
         Stamp folded = op.foldStamp(v1stamp, v2stamp);
         if (v1stamp.isEmpty() || v2stamp.isEmpty()) {
             assertTrue(folded.isEmpty());
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/calc/SignedRemNode.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/calc/SignedRemNode.java	Mon May 06 21:50:20 2019 +0200
@@ -84,7 +84,7 @@
             IntegerStamp yStamp = (IntegerStamp) forY.stamp(view);
             if (constY < 0 && constY != CodeUtil.minValue(yStamp.getBits())) {
                 Stamp newStamp = IntegerStamp.OPS.getRem().foldStamp(forX.stamp(view), forY.stamp(view));
-                return canonical(null, forX, ConstantNode.forIntegerStamp(yStamp, -constY), zeroCheck, newStamp, view, tool);
+                return canonical(self, forX, ConstantNode.forIntegerStamp(yStamp, -constY), zeroCheck, newStamp, view, tool);
             }
 
             if (constY == 1) {
@@ -104,10 +104,19 @@
                 }
             }
         }
-        return self != null ? self : new SignedRemNode(forX, forY, zeroCheck);
+        if (self != null && self.x == forX && self.y == forY) {
+            return self;
+        } else {
+            return new SignedRemNode(forX, forY, zeroCheck);
+        }
     }
 
     private static boolean allUsagesCompareAgainstZero(SignedRemNode self) {
+        if (self == null) {
+            // If the node was not yet created, then we do not know its usages yet.
+            return false;
+        }
+
         int compareAgainstZero = 0;
         int usageCount = self.getUsageCount();
         for (int i = 0; i < usageCount; i++) {
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/ArrayLengthNode.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/ArrayLengthNode.java	Mon May 06 21:50:20 2019 +0200
@@ -33,6 +33,7 @@
 import org.graalvm.compiler.graph.spi.CanonicalizerTool;
 import org.graalvm.compiler.nodeinfo.NodeInfo;
 import org.graalvm.compiler.nodes.ConstantNode;
+import org.graalvm.compiler.nodes.DeoptimizeNode;
 import org.graalvm.compiler.nodes.FixedWithNextNode;
 import org.graalvm.compiler.nodes.ValueNode;
 import org.graalvm.compiler.nodes.spi.ArrayLengthProvider;
@@ -44,6 +45,8 @@
 import org.graalvm.compiler.nodes.virtual.VirtualArrayNode;
 
 import jdk.vm.ci.meta.ConstantReflectionProvider;
+import jdk.vm.ci.meta.DeoptimizationAction;
+import jdk.vm.ci.meta.DeoptimizationReason;
 
 /**
  * The {@code ArrayLength} instruction gets the length of an array.
@@ -83,6 +86,9 @@
 
     @Override
     public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
+        if (forValue.isNullConstant()) {
+            return new DeoptimizeNode(DeoptimizationAction.InvalidateReprofile, DeoptimizationReason.NullCheckException);
+        }
         ValueNode length = readArrayLength(forValue, tool.getConstantReflection());
         if (length != null) {
             return length;
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/LoadIndexedNode.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/LoadIndexedNode.java	Mon May 06 21:50:20 2019 +0200
@@ -40,6 +40,7 @@
 import org.graalvm.compiler.graph.spi.SimplifierTool;
 import org.graalvm.compiler.nodeinfo.NodeInfo;
 import org.graalvm.compiler.nodes.ConstantNode;
+import org.graalvm.compiler.nodes.DeoptimizeNode;
 import org.graalvm.compiler.nodes.FixedGuardNode;
 import org.graalvm.compiler.nodes.FixedWithNextNode;
 import org.graalvm.compiler.nodes.LogicNode;
@@ -140,6 +141,9 @@
 
     @Override
     public Node canonical(CanonicalizerTool tool) {
+        if (array().isNullConstant()) {
+            return new DeoptimizeNode(DeoptimizationAction.InvalidateReprofile, DeoptimizationReason.NullCheckException);
+        }
         ValueNode constant = tryConstantFold(array(), index(), tool.getMetaAccess(), tool.getConstantReflection());
         if (constant != null) {
             return constant;
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/NewInstanceNode.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/NewInstanceNode.java	Mon May 06 21:50:20 2019 +0200
@@ -60,7 +60,7 @@
 
     protected NewInstanceNode(NodeClass<? extends NewInstanceNode> c, ResolvedJavaType type, boolean fillContents, FrameState stateBefore) {
         super(c, StampFactory.objectNonNull(TypeReference.createExactTrusted(type)), fillContents, stateBefore);
-        assert !type.isArray() && !type.isInterface() && !type.isPrimitive() && !type.isAbstract();
+        assert !type.isArray() && !type.isInterface() && !type.isPrimitive() && !type.isAbstract() : type;
         this.instanceClass = type;
     }
 
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/StoreFieldNode.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/StoreFieldNode.java	Mon May 06 21:50:20 2019 +0200
@@ -27,10 +27,14 @@
 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_8;
 
 import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.graph.Node;
 import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.graph.spi.Canonicalizable;
+import org.graalvm.compiler.graph.spi.CanonicalizerTool;
 import org.graalvm.compiler.nodeinfo.InputType;
 import org.graalvm.compiler.nodeinfo.NodeCycles;
 import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.DeoptimizeNode;
 import org.graalvm.compiler.nodes.FrameState;
 import org.graalvm.compiler.nodes.StateSplit;
 import org.graalvm.compiler.nodes.ValueNode;
@@ -39,13 +43,15 @@
 import org.graalvm.compiler.nodes.virtual.VirtualInstanceNode;
 import org.graalvm.compiler.nodes.virtual.VirtualObjectNode;
 
+import jdk.vm.ci.meta.DeoptimizationAction;
+import jdk.vm.ci.meta.DeoptimizationReason;
 import jdk.vm.ci.meta.ResolvedJavaField;
 
 /**
  * The {@code StoreFieldNode} represents a write to a static or instance field.
  */
 @NodeInfo(nameTemplate = "StoreField#{p#field/s}")
-public final class StoreFieldNode extends AccessFieldNode implements StateSplit, Virtualizable {
+public final class StoreFieldNode extends AccessFieldNode implements StateSplit, Virtualizable, Canonicalizable {
     public static final NodeClass<StoreFieldNode> TYPE = NodeClass.create(StoreFieldNode.class);
 
     @Input ValueNode value;
@@ -111,4 +117,12 @@
         }
         return super.estimatedNodeCycles();
     }
+
+    @Override
+    public Node canonical(CanonicalizerTool tool) {
+        if (!field.isStatic() && object.isNullConstant()) {
+            return new DeoptimizeNode(DeoptimizationAction.InvalidateReprofile, DeoptimizationReason.NullCheckException);
+        }
+        return this;
+    }
 }
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/StoreIndexedNode.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/StoreIndexedNode.java	Mon May 06 21:50:20 2019 +0200
@@ -29,9 +29,13 @@
 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_8;
 
 import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.graph.Node;
 import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.graph.spi.Canonicalizable;
+import org.graalvm.compiler.graph.spi.CanonicalizerTool;
 import org.graalvm.compiler.nodeinfo.InputType;
 import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.DeoptimizeNode;
 import org.graalvm.compiler.nodes.FrameState;
 import org.graalvm.compiler.nodes.StateSplit;
 import org.graalvm.compiler.nodes.ValueNode;
@@ -43,6 +47,8 @@
 import org.graalvm.compiler.nodes.virtual.VirtualArrayNode;
 import org.graalvm.compiler.nodes.virtual.VirtualObjectNode;
 
+import jdk.vm.ci.meta.DeoptimizationAction;
+import jdk.vm.ci.meta.DeoptimizationReason;
 import jdk.vm.ci.meta.JavaKind;
 import jdk.vm.ci.meta.ResolvedJavaType;
 
@@ -50,7 +56,7 @@
  * The {@code StoreIndexedNode} represents a write to an array element.
  */
 @NodeInfo(cycles = CYCLES_8, size = SIZE_8)
-public final class StoreIndexedNode extends AccessIndexedNode implements StateSplit, Lowerable, Virtualizable {
+public final class StoreIndexedNode extends AccessIndexedNode implements StateSplit, Lowerable, Virtualizable, Canonicalizable {
 
     public static final NodeClass<StoreIndexedNode> TYPE = NodeClass.create(StoreIndexedNode.class);
 
@@ -110,4 +116,12 @@
     public FrameState getState() {
         return stateAfter;
     }
+
+    @Override
+    public Node canonical(CanonicalizerTool tool) {
+        if (array().isNullConstant()) {
+            return new DeoptimizeNode(DeoptimizationAction.InvalidateReprofile, DeoptimizationReason.NullCheckException);
+        }
+        return this;
+    }
 }
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/spi/LoweringProvider.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/spi/LoweringProvider.java	Mon May 06 21:50:20 2019 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -54,4 +54,11 @@
         // most platforms only support 32 and 64 bit compares
         return 32;
     }
+
+    /**
+     * Indicates whether the target platform supports bulk zeroing instruction.
+     */
+    default boolean supportBulkZeroing() {
+        return false;
+    }
 }
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.phases.common/src/org/graalvm/compiler/phases/common/ConditionalEliminationPhase.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.phases.common/src/org/graalvm/compiler/phases/common/ConditionalEliminationPhase.java	Mon May 06 21:50:20 2019 +0200
@@ -88,6 +88,7 @@
 import org.graalvm.compiler.nodes.extended.IntegerSwitchNode;
 import org.graalvm.compiler.nodes.extended.LoadHubNode;
 import org.graalvm.compiler.nodes.extended.ValueAnchorNode;
+import org.graalvm.compiler.nodes.java.InstanceOfNode;
 import org.graalvm.compiler.nodes.java.TypeSwitchNode;
 import org.graalvm.compiler.nodes.spi.NodeWithState;
 import org.graalvm.compiler.nodes.spi.StampInverter;
@@ -364,7 +365,38 @@
                     node.setCondition(LogicConstantNode.forBoolean(result, node.graph()), node.isNegated());
                     // Don't kill this branch immediately, see `processGuard`.
                 }
-                debug.log("Kill fixed guard guard");
+
+                if (guard instanceof DeoptimizingGuard && !node.isNegated() && !((DeoptimizingGuard) guard).isNegated()) {
+                    LogicNode newCondition = ((DeoptimizingGuard) guard.asNode()).getCondition();
+                    if (newCondition instanceof InstanceOfNode) {
+                        InstanceOfNode inst = (InstanceOfNode) newCondition;
+                        ValueNode originalValue = GraphUtil.skipPi(inst.getValue());
+                        PiNode pi = null;
+                        // Ensure that any Pi that's weaker than what the instanceof proves is
+                        // replaced by one derived from the instanceof itself.
+                        for (PiNode existing : guard.asNode().usages().filter(PiNode.class).snapshot()) {
+                            if (!existing.isAlive()) {
+                                continue;
+                            }
+                            if (originalValue != GraphUtil.skipPi(existing.object())) {
+                                // Somehow these are unrelated values so leave it alone
+                                continue;
+                            }
+                            // If the pi has a weaker stamp or the same stamp but a different input
+                            // then replace it.
+                            boolean strongerStamp = !existing.piStamp().join(inst.getCheckedStamp()).equals(inst.getCheckedStamp());
+                            boolean differentStamp = !existing.piStamp().equals(inst.getCheckedStamp());
+                            boolean differentObject = existing.object() != inst.getValue();
+                            if (!strongerStamp && (differentStamp || differentObject)) {
+                                if (pi == null) {
+                                    pi = graph.unique(new PiNode(inst.getValue(), inst.getCheckedStamp(), (ValueNode) guard));
+                                }
+                                existing.replaceAndDelete(pi);
+                            }
+                        }
+                    }
+                }
+                debug.log("Kill fixed guard %s", node);
                 return true;
             })) {
                 registerNewCondition(node.condition(), node.isNegated(), node);
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.printer/src/org/graalvm/compiler/printer/BinaryGraphPrinter.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.printer/src/org/graalvm/compiler/printer/BinaryGraphPrinter.java	Mon May 06 21:50:20 2019 +0200
@@ -91,7 +91,7 @@
     public BinaryGraphPrinter(DebugContext ctx, SnippetReflectionProvider snippetReflection) throws IOException {
         // @formatter:off
         this.output = ctx.buildOutput(GraphOutput.newBuilder(this).
-                        protocolVersion(6, 0).
+                        protocolVersion(6, 1).
                         blocks(this).
                         elementsAndLocations(this, this).
                         types(this)
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements.aarch64/src/org/graalvm/compiler/replacements/aarch64/AArch64GraphBuilderPlugins.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements.aarch64/src/org/graalvm/compiler/replacements/aarch64/AArch64GraphBuilderPlugins.java	Mon May 06 21:50:20 2019 +0200
@@ -59,7 +59,13 @@
 
 public class AArch64GraphBuilderPlugins {
 
-    public static void register(Plugins plugins, BytecodeProvider bytecodeProvider, boolean explicitUnsafeNullChecks, boolean registerMathPlugins) {
+    public static void register(Plugins plugins, BytecodeProvider bytecodeProvider, boolean explicitUnsafeNullChecks,
+                    boolean registerMathPlugins) {
+        register(plugins, bytecodeProvider, explicitUnsafeNullChecks, registerMathPlugins, true);
+    }
+
+    public static void register(Plugins plugins, BytecodeProvider bytecodeProvider, boolean explicitUnsafeNullChecks,
+                    boolean registerMathPlugins, boolean emitJDK9StringSubstitutions) {
         InvocationPlugins invocationPlugins = plugins.getInvocationPlugins();
         invocationPlugins.defer(new Runnable() {
             @Override
@@ -69,8 +75,10 @@
                 if (registerMathPlugins) {
                     registerMathPlugins(invocationPlugins);
                 }
-                registerStringLatin1Plugins(invocationPlugins, bytecodeProvider);
-                registerStringUTF16Plugins(invocationPlugins, bytecodeProvider);
+                if (emitJDK9StringSubstitutions) {
+                    registerStringLatin1Plugins(invocationPlugins, bytecodeProvider);
+                    registerStringUTF16Plugins(invocationPlugins, bytecodeProvider);
+                }
                 registerUnsafePlugins(invocationPlugins, bytecodeProvider);
                 // This is temporarily disabled until we implement correct emitting of the CAS
                 // instructions of the proper width.
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements/src/org/graalvm/compiler/replacements/nodes/ZeroMemoryNode.java	Mon May 06 21:50:20 2019 +0200
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+
+package org.graalvm.compiler.replacements.nodes;
+
+import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_8;
+import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_8;
+
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.nodeinfo.InputType;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.ValueNode;
+import org.graalvm.compiler.nodes.memory.FixedAccessNode;
+import org.graalvm.compiler.nodes.memory.address.AddressNode;
+import org.graalvm.compiler.nodes.memory.address.OffsetAddressNode;
+import org.graalvm.compiler.nodes.spi.LIRLowerable;
+import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
+import org.graalvm.compiler.word.Word;
+import jdk.internal.vm.compiler.word.LocationIdentity;
+
+/**
+ * Zeros a chunk of memory.
+ */
+@NodeInfo(nameTemplate = "ZeroMemory#{p#location/s}", allowedUsageTypes = {InputType.Memory}, cycles = CYCLES_8, size = SIZE_8)
+public class ZeroMemoryNode extends FixedAccessNode implements LIRLowerable {
+    public static final NodeClass<ZeroMemoryNode> TYPE = NodeClass.create(ZeroMemoryNode.class);
+
+    @Input ValueNode length;
+
+    public ZeroMemoryNode(ValueNode address, ValueNode length, LocationIdentity locationIdentity) {
+        this(OffsetAddressNode.create(address), length, locationIdentity, BarrierType.NONE);
+    }
+
+    public ZeroMemoryNode(AddressNode address, ValueNode length, LocationIdentity locationIdentity, BarrierType type) {
+        super(TYPE, address, locationIdentity, StampFactory.forVoid(), type);
+        this.length = length;
+    }
+
+    @Override
+    public void generate(NodeLIRBuilderTool gen) {
+        gen.getLIRGeneratorTool().getArithmetic().emitZeroMemory(gen.operand(getAddress()), gen.operand(length));
+    }
+
+    @Override
+    public boolean canNullCheck() {
+        return false;
+    }
+
+    @NodeIntrinsic
+    public static native void zero(Word address, long length, @ConstantNodeParameter LocationIdentity locationIdentity);
+}
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.virtual/src/org/graalvm/compiler/virtual/phases/ea/GraphEffectList.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.virtual/src/org/graalvm/compiler/virtual/phases/ea/GraphEffectList.java	Mon May 06 21:50:20 2019 +0200
@@ -223,7 +223,7 @@
      */
     public void replaceAtUsages(ValueNode node, ValueNode replacement, FixedNode insertBefore) {
         assert node != null && replacement != null : node + " " + replacement;
-        assert node.stamp(NodeView.DEFAULT).isCompatible(replacement.stamp(NodeView.DEFAULT)) : "Replacement node stamp not compatible " + node.stamp(NodeView.DEFAULT) + " vs " +
+        assert !node.hasUsages() || node.stamp(NodeView.DEFAULT).isCompatible(replacement.stamp(NodeView.DEFAULT)) : "Replacement node stamp not compatible " + node.stamp(NodeView.DEFAULT) + " vs " +
                         replacement.stamp(NodeView.DEFAULT);
         add("replace at usages", (graph, obsoleteNodes) -> {
             assert node.isAlive();
@@ -240,7 +240,7 @@
              * to improve the stamp information of the read. Such a read might later be replaced
              * with a read with a less precise stamp.
              */
-            if (!node.stamp(NodeView.DEFAULT).equals(replacementNode.stamp(NodeView.DEFAULT))) {
+            if (node.hasUsages() && !node.stamp(NodeView.DEFAULT).equals(replacementNode.stamp(NodeView.DEFAULT))) {
                 replacementNode = graph.unique(new PiNode(replacementNode, node.stamp(NodeView.DEFAULT)));
             }
             node.replaceAtUsages(replacementNode);
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.graphio/src/org/graalvm/graphio/GraphProtocol.java	Mon May 06 12:17:54 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.graphio/src/org/graalvm/graphio/GraphProtocol.java	Mon May 06 21:50:20 2019 +0200
@@ -75,6 +75,9 @@
 
     private static final byte[] MAGIC_BYTES = {'B', 'I', 'G', 'V'};
 
+    private static final int MAJOR_VERSION = 6;
+    private static final int MINOR_VERSION = 1;
+
     private final ConstantPool constantPool;
     private final ByteBuffer buffer;
     private final WritableByteChannel channel;
@@ -84,7 +87,7 @@
     private boolean printing;
 
     GraphProtocol(WritableByteChannel channel, int major, int minor, boolean embedded) throws IOException {
-        if (major > 6 || (major == 6 && minor > 0)) {
+        if (major > MAJOR_VERSION || (major == MAJOR_VERSION && minor > MINOR_VERSION)) {
             throw new IllegalArgumentException("Unrecognized version " + major + "." + minor);
         }
         this.versionMajor = major;
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.micro.benchmarks/src/micro/benchmarks/ArrayAllocationBenchmark.java	Mon May 06 21:50:20 2019 +0200
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+
+package micro.benchmarks;
+
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.Param;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.Threads;
+import org.openjdk.jmh.annotations.Warmup;
+
+/**
+ * Benchmarks cost of ArrayList.
+ */
+public class ArrayAllocationBenchmark extends BenchmarkBase {
+
+    @State(Scope.Benchmark)
+    public static class ThreadState {
+        @Param({"128", "256", "512", "1024", "2048", "4096", "8192", "16384", "32768", "65536", "131072"}) int size;
+        byte[] result;
+    }
+
+    @Benchmark
+    @Threads(8)
+    @Warmup(iterations = 10)
+    public void arrayAllocate(ThreadState state) {
+        state.result = new byte[state.size];
+    }
+}