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/*
* Copyright 1998-2007 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.
*
*/
// For Sun Studio - implementation is in solaris_i486.il.
// For gcc - implementation is just below.
extern "C" u2 _raw_swap_u2(u2 x);
extern "C" u4 _raw_swap_u4(u4 x);
#ifdef AMD64
extern "C" u8 _raw_swap_u8(u8 x);
#else
extern "C" u8 _raw_swap_u8(u4 x, u4 y);
#endif // AMD64
// Efficient swapping of data bytes from Java byte
// ordering to native byte ordering and vice versa.
inline u2 Bytes::swap_u2(u2 x) {
return _raw_swap_u2(x);
}
inline u4 Bytes::swap_u4(u4 x) {
return _raw_swap_u4(x);
}
inline u8 Bytes::swap_u8(u8 x) {
#ifdef AMD64
return _raw_swap_u8(x);
#else
return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));
#endif // AMD64
}
#ifndef AMD64
// Helper function for swap_u8
inline u8 Bytes::swap_u8_base(u4 x, u4 y) {
return _raw_swap_u8(x, y);
}
#endif // !AMD64
#ifdef _GNU_SOURCE
extern "C" {
#ifdef AMD64
inline u2 _raw_swap_u2(u2 x) {
register unsigned short int __dest;
__asm__ ("rorw $8, %w0": "=r" (__dest): "0" (x): "cc");
return __dest;
}
inline u4 _raw_swap_u4(u4 x) {
register unsigned int __dest;
__asm__ ("bswap %0" : "=r" (__dest) : "0" (x));
return __dest;
}
inline u8 _raw_swap_u8(u8 x) {
register unsigned long __dest;
__asm__ ("bswap %q0" : "=r" (__dest) : "0" (x));
return __dest;
}
#else
inline u2 _raw_swap_u2(u2 x) {
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;
}
inline u4 _raw_swap_u4(u4 x) {
u4 ret;
__asm__ __volatile__ (
"bswap %0"
:"=r" (ret) // output : register 0 => ret
:"0" (x) // input : x => register 0
:"0" // clobbered register
);
return ret;
}
inline u8 _raw_swap_u8(u4 x, u4 y) {
return (((u8)_raw_swap_u4(x))<<32) | _raw_swap_u4(y);
}
#endif // AMD64
}
#endif //_GNU_SOURCE
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