changeset 10533:41dd7c59dd6f

8055852: Add test/java/lang/Math/DoubleConsts.java and FloatConsts.java Reviewed-by: mchung, darcy Contributed-by: amy.lu@oracle.com
author mchung
date Fri, 22 Aug 2014 18:54:20 -0700
parents 74078474d9bd
children 6e125fc55925
files test/java/lang/Math/DoubleConsts.java test/java/lang/Math/FloatConsts.java
diffstat 2 files changed, 148 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/java/lang/Math/DoubleConsts.java	Fri Aug 22 18:54:20 2014 -0700
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2014, 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.
+ */
+
+/**
+ * Common library for additional constants of the {@code double} type.
+ */
+public final class DoubleConsts {
+    /**
+     * Don't let anyone instantiate this class.
+     */
+    private DoubleConsts() {}
+
+    /**
+     * Bias used in representing a {@code double} exponent.
+     */
+    public static final int     EXP_BIAS        = 1023;
+
+    /**
+     * Bit mask to isolate the exponent field of a {@code double}.
+     */
+    public static final long    EXP_BIT_MASK    = 0x7FF0000000000000L;
+
+    /**
+     * Bit mask to isolate the sign bit of a {@code double}.
+     */
+    public static final long    SIGN_BIT_MASK   = 0x8000000000000000L;
+
+    /**
+     * Bit mask to isolate the significand field of a {@code double}.
+     */
+    public static final long    SIGNIF_BIT_MASK = 0x000FFFFFFFFFFFFFL;
+
+    /**
+     * The number of logical bits in the significand of a
+     * {@code double} number, including the implicit bit.
+     */
+    public static final int SIGNIFICAND_WIDTH   = 53;
+
+    /**
+     * The exponent the smallest positive {@code double}
+     * subnormal value would have if it could be normalized.
+     */
+    public static final int     MIN_SUB_EXPONENT = Double.MIN_EXPONENT -
+                                                   (SIGNIFICAND_WIDTH - 1);
+
+    static {
+        // verify bit masks cover all bit positions and that the bit
+        // masks are non-overlapping
+        assert(((SIGN_BIT_MASK | EXP_BIT_MASK | SIGNIF_BIT_MASK) == ~0L) &&
+               (((SIGN_BIT_MASK & EXP_BIT_MASK) == 0L) &&
+                ((SIGN_BIT_MASK & SIGNIF_BIT_MASK) == 0L) &&
+                ((EXP_BIT_MASK & SIGNIF_BIT_MASK) == 0L)));
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/java/lang/Math/FloatConsts.java	Fri Aug 22 18:54:20 2014 -0700
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2014, 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.
+ */
+
+/**
+ * Common library for additional constants of the {@code float} type.
+ */
+public final class FloatConsts {
+    /**
+     * Don't let anyone instantiate this class.
+     */
+    private FloatConsts() {}
+
+    /**
+     * Bias used in representing a {@code float} exponent.
+     */
+    public static final int     EXP_BIAS        = 127;
+
+    /**
+     * Bit mask to isolate the exponent field of a {@code float}.
+     */
+    public static final int     EXP_BIT_MASK    = 0x7F800000;
+
+    /**
+     * Bit mask to isolate the sign bit of a {@code float}.
+     */
+    public static final int     SIGN_BIT_MASK   = 0x80000000;
+
+    /**
+     * Bit mask to isolate the significand field of a {@code float}.
+     */
+    public static final int     SIGNIF_BIT_MASK = 0x007FFFFF;
+
+    /**
+     * The number of logical bits in the significand of a
+     * {@code float} number, including the implicit bit.
+     */
+    public static final int SIGNIFICAND_WIDTH   = 24;
+
+    /**
+     * The exponent the smallest positive {@code float} subnormal
+     * value would have if it could be normalized.
+     */
+    public static final int     MIN_SUB_EXPONENT = Float.MIN_EXPONENT -
+                                                   (SIGNIFICAND_WIDTH - 1);
+
+    static {
+        // verify bit masks cover all bit positions and that the bit
+        // masks are non-overlapping
+        assert(((SIGN_BIT_MASK | EXP_BIT_MASK | SIGNIF_BIT_MASK) == ~0) &&
+               (((SIGN_BIT_MASK & EXP_BIT_MASK) == 0) &&
+                ((SIGN_BIT_MASK & SIGNIF_BIT_MASK) == 0) &&
+                ((EXP_BIT_MASK & SIGNIF_BIT_MASK) == 0)));
+    }
+}