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view src/os_cpu/windows_x86/vm/bytes_windows_x86.inline.hpp @ 2835:c1c8a0291771
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author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Tue, 31 May 2011 13:37:45 +0200 |
parents | f95d63e2154a |
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/* * Copyright (c) 1998, 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_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP #define OS_CPU_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP #pragma warning(disable: 4035) // Disable warning 4035: no return value // Efficient swapping of data bytes from Java byte // ordering to native byte ordering and vice versa. inline u2 Bytes::swap_u2(u2 x) { #ifdef AMD64 address p = (address) &x; return ( (u2(p[0]) << 8 ) | ( u2(p[1])) ); #else __asm { mov ax, x xchg al, ah } // no return statement needed, result is already in ax // compiler warning C4035 disabled via warning pragma #endif // AMD64 } inline u4 Bytes::swap_u4(u4 x) { #ifdef AMD64 address p = (address) &x; return ( (u4(p[0]) << 24) | (u4(p[1]) << 16) | (u4(p[2]) << 8) | u4(p[3])) ; #else __asm { mov eax, x bswap eax } // no return statement needed, result is already in eax // compiler warning C4035 disabled via warning pragma #endif // AMD64 } #ifdef AMD64 inline u8 Bytes::swap_u8(u8 x) { address p = (address) &x; return ( (u8(p[0]) << 56) | (u8(p[1]) << 48) | (u8(p[2]) << 40) | (u8(p[3]) << 32) | (u8(p[4]) << 24) | (u8(p[5]) << 16) | (u8(p[6]) << 8) | u8(p[7])) ; } #else // Helper function for swap_u8 inline u8 Bytes::swap_u8_base(u4 x, u4 y) { __asm { mov eax, y mov edx, x bswap eax bswap edx } // no return statement needed, result is already in edx:eax // compiler warning C4035 disabled via warning pragma } inline u8 Bytes::swap_u8(u8 x) { return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1)); } #endif // AMD64 #pragma warning(default: 4035) // Enable warning 4035: no return value #endif // OS_CPU_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP