Mercurial > hg > truffle
diff 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 |
parents | |
children | 485d403e94e1 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/os_cpu/linux_x86/vm/bytes_linux_x86.inline.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,74 @@ +/* + * 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