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view src/os_cpu/linux_x86/vm/bytes_linux_x86.inline.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | 485d403e94e1 |
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/* * Copyright 1999-2001 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. * */ #include <byteswap.h> // 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 return bswap_16(x); #else u2 ret; __asm__ __volatile__ ( "movw %0, %%ax;" "xchg %%al, %%ah;" "movw %%ax, %0" :"=r" (ret) // output : register 0 => ret :"0" (x) // input : x => register 0 :"ax", "0" // clobbered registers ); return ret; #endif // AMD64 } inline u4 Bytes::swap_u4(u4 x) { #ifdef AMD64 return bswap_32(x); #else u4 ret; __asm__ __volatile__ ( "bswap %0" :"=r" (ret) // output : register 0 => ret :"0" (x) // input : x => register 0 :"0" // clobbered register ); return ret; #endif // AMD64 } #ifdef AMD64 inline u8 Bytes::swap_u8(u8 x) { return bswap_64(x); } #else // Helper function for swap_u8 inline u8 Bytes::swap_u8_base(u4 x, u4 y) { return (((u8)swap_u4(x))<<32) | swap_u4(y); } inline u8 Bytes::swap_u8(u8 x) { return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1)); } #endif // !AMD64