1/* 2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef OS_CPU_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP 26#define OS_CPU_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP 27 28#pragma warning(disable: 4035) // Disable warning 4035: no return value 29 30// Efficient swapping of data bytes from Java byte 31// ordering to native byte ordering and vice versa. 32inline u2 Bytes::swap_u2(u2 x) { 33#ifdef AMD64 34 address p = (address) &x; 35 return ( (u2(p[0]) << 8 ) | ( u2(p[1])) ); 36#else 37 __asm { 38 mov ax, x 39 xchg al, ah 40 } 41 // no return statement needed, result is already in ax 42 // compiler warning C4035 disabled via warning pragma 43#endif // AMD64 44} 45 46inline u4 Bytes::swap_u4(u4 x) { 47#ifdef AMD64 48 address p = (address) &x; 49 return ( (u4(p[0]) << 24) | (u4(p[1]) << 16) | (u4(p[2]) << 8) | u4(p[3])) ; 50#else 51 __asm { 52 mov eax, x 53 bswap eax 54 } 55 // no return statement needed, result is already in eax 56 // compiler warning C4035 disabled via warning pragma 57#endif // AMD64 58} 59 60#ifdef AMD64 61inline u8 Bytes::swap_u8(u8 x) { 62 address p = (address) &x; 63 return ( (u8(p[0]) << 56) | (u8(p[1]) << 48) | (u8(p[2]) << 40) | (u8(p[3]) << 32) | 64 (u8(p[4]) << 24) | (u8(p[5]) << 16) | (u8(p[6]) << 8) | u8(p[7])) ; 65} 66 67#else 68// Helper function for swap_u8 69inline u8 Bytes::swap_u8_base(u4 x, u4 y) { 70 __asm { 71 mov eax, y 72 mov edx, x 73 bswap eax 74 bswap edx 75 } 76 // no return statement needed, result is already in edx:eax 77 // compiler warning C4035 disabled via warning pragma 78} 79 80inline u8 Bytes::swap_u8(u8 x) { 81 return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1)); 82} 83#endif // AMD64 84 85#pragma warning(default: 4035) // Enable warning 4035: no return value 86 87#endif // OS_CPU_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP 88