/*
* 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
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*/
#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