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8012715: G1: GraphKit accesses PtrQueue::_index as int but is size_t Summary: In graphKit INT operations were generated to access PtrQueue::_index which has type size_t. This is 64 bit on 64-bit machines. No problems occur on little endian machines as long as the index fits into 32 bit, but on big endian machines the upper part is read, which is zero. This leads to unnecessary branches to the slow path in the runtime. Reviewed-by: twisti, johnc Contributed-by: Martin Doerr <martin.doerr@sap.com>
author johnc
date Wed, 24 Apr 2013 14:48:43 -0700
parents 436b4a3231bf
children
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/*
 * Copyright (c) 2003, 2010, 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.
 *
 */

#ifndef OS_CPU_BSD_ZERO_VM_BYTES_BSD_ZERO_INLINE_HPP
#define OS_CPU_BSD_ZERO_VM_BYTES_BSD_ZERO_INLINE_HPP

// Efficient swapping of data bytes from Java byte
// ordering to native byte ordering and vice versa.

#ifdef __APPLE__
#  include <libkern/OSByteOrder.h>
#else
#  include <sys/endian.h>
#endif

#if defined(__APPLE__)
#  define bswap_16(x)   OSSwapInt16(x)
#  define bswap_32(x)   OSSwapInt32(x)
#  define bswap_64(x)   OSSwapInt64(x)
#elif defined(__OpenBSD__)
#  define bswap_16(x)   swap16(x)
#  define bswap_32(x)   swap32(x)
#  define bswap_64(x)   swap64(x)
#elif defined(__NetBSD__)
#  define bswap_16(x)   bswap16(x)
#  define bswap_32(x)   bswap32(x)
#  define bswap_64(x)   bswap64(x)
#else
#  define bswap_16(x) __bswap16(x)
#  define bswap_32(x) __bswap32(x)
#  define bswap_64(x) __bswap64(x)
#endif

inline u2 Bytes::swap_u2(u2 x) {
  return bswap_16(x);
}

inline u4 Bytes::swap_u4(u4 x) {
  return bswap_32(x);
}

inline u8 Bytes::swap_u8(u8 x) {
  return bswap_64(x);
}

#endif // OS_CPU_BSD_ZERO_VM_BYTES_BSD_ZERO_INLINE_HPP