view src/share/vm/libadt/port.cpp @ 0:a61af66fc99e

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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/*
 * Copyright 1997-1998 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 */

// Code for portable compiling

#ifdef __GNUC__
#pragma implementation
#endif

#include "incls/_precompiled.incl"
#include "incls/_port.cpp.incl"

// %%%%% includes not needed with AVM framework - Ungar
// #include "port.hpp"

// This is only used if turboc is used and it causes problems with
// gcc.
#ifdef __TURBOC__
#include <iostream.h>
#endif

#include <stdio.h>

//------------------------------gcd--------------------------------------------
// Greatest common divisor
uint32 gcd( register uint32 x, register uint32 y )
{
  register uint32 tmp;
  while( x ) {                  // While not zero
    tmp = x;                    // Hold onto smaller x value
    x = y % x;                  // Compute modulus; since y>=x, 0 <= mod < x
    y = tmp;                    // y = old x
  }
  return y;
}

//-----------------------------------------------------------------------------
// Find first 1, or return 32 if empty
int ff1( uint32 mask )
{
  unsigned i, n = 0;

  for( i=1, n=0; i; i<<=1, n++)
    if( mask&i ) return n;
  return 32;
}

//-----------------------------------------------------------------------------
// Find highest 1, or return 32 if empty
int fh1( uint32 mask )
{
  unsigned i, n = 0;

  for( i=((uint32)1<<31), n=31; i; i>>=1, n--)
    if( mask&i ) return n;
  return 32;
}

//------------------------------rotate32---------------------------------------
// Rotate 32bits.  Postive rotates left (bits move toward high-order bit),
// negative rotates right.
uint32 rotate32( register uint32 x, register int32 cnt )
{
  if( cnt >= 0 ) {              // Positive rotates left
    cnt &= 31;                  // Mask off extra shift bits
  } else {                      // Negative rotates right
    cnt = (-cnt)&31;            // Flip sign; mask extra shift bits
    cnt = 32-cnt;               // Rotate right by big left rotation
  }
  return (x << cnt) | (x >> (32-cnt));
}

/* Disabled - we have another log2 in the system.
   This function doesn't work if used as substitute
   for the existing log2. Keep around until we have
   verified all uses of log2 do the correct thing!
//------------------------------log2-------------------------------------------
// Log base 2.  Might also be called 'count leading zeros'.  Log2(x) returns
// an l such that (1L<<l) <= x < (2L<<l).  log2(x) returns 32.
uint log2( uint32 x )
{
  register uint l = 32;         // Log bits
  register int32 sx = x;        // Treat as signed number
  while( sx >= 0 )              // While high bit is clear
    sx <<= 1, l--;              // Shift bits left, count down log2
  return l;
}
*/

//------------------------------print------------------------------------------
// Print a pointer without modifying the contents
#ifdef __TURBOC__
ostream &ostream::operator << (const void *ptr)
{
  return (*this) << "0x" << hex << (uint)ptr << dec;
}
#else
/*ostream &operator << (ostream &os, const void *ptr)
{
  return os << "0x" << hex << (uint)ptr << dec;
}*/
#endif