duke@435: /*
trims@1907:  * Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: #pragma warning(disable: 4035) // Disable warning 4035: no return value
duke@435: 
duke@435: // Efficient swapping of data bytes from Java byte
duke@435: // ordering to native byte ordering and vice versa.
duke@435: inline u2 Bytes::swap_u2(u2 x) {
duke@435: #ifdef AMD64
duke@435:   address p = (address) &x;
duke@435:   return  ( (u2(p[0]) << 8 ) | ( u2(p[1])) );
duke@435: #else
duke@435:   __asm {
duke@435:     mov ax, x
duke@435:     xchg al, ah
duke@435:   }
duke@435:   // no return statement needed, result is already in ax
duke@435:   // compiler warning C4035 disabled via warning pragma
duke@435: #endif // AMD64
duke@435: }
duke@435: 
duke@435: inline u4 Bytes::swap_u4(u4 x) {
duke@435: #ifdef AMD64
duke@435:   address p = (address) &x;
duke@435:   return ( (u4(p[0]) << 24) | (u4(p[1]) << 16) | (u4(p[2]) << 8) | u4(p[3])) ;
duke@435: #else
duke@435:   __asm {
duke@435:     mov eax, x
duke@435:     bswap eax
duke@435:   }
duke@435:   // no return statement needed, result is already in eax
duke@435:   // compiler warning C4035 disabled via warning pragma
duke@435: #endif // AMD64
duke@435: }
duke@435: 
duke@435: #ifdef AMD64
duke@435: inline u8 Bytes::swap_u8(u8 x) {
duke@435:   address p = (address) &x;
duke@435:   return ( (u8(p[0]) << 56) | (u8(p[1]) << 48) | (u8(p[2]) << 40) | (u8(p[3]) << 32) |
duke@435:            (u8(p[4]) << 24) | (u8(p[5]) << 16) | (u8(p[6]) << 8)  | u8(p[7])) ;
duke@435: }
duke@435: 
duke@435: #else
duke@435: // Helper function for swap_u8
duke@435: inline u8 Bytes::swap_u8_base(u4 x, u4 y) {
duke@435:   __asm {
duke@435:     mov eax, y
duke@435:     mov edx, x
duke@435:     bswap eax
duke@435:     bswap edx
duke@435:   }
duke@435:   // no return statement needed, result is already in edx:eax
duke@435:   // compiler warning C4035 disabled via warning pragma
duke@435: }
duke@435: 
duke@435: inline u8 Bytes::swap_u8(u8 x) {
duke@435:   return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));
duke@435: }
duke@435: #endif // AMD64
duke@435: 
duke@435: #pragma warning(default: 4035) // Enable warning 4035: no return value