1 /* 2 * Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #pragma warning(disable: 4035) // Disable warning 4035: no return value 26 27 // Efficient swapping of data bytes from Java byte 28 // ordering to native byte ordering and vice versa. 29 inline u2 Bytes::swap_u2(u2 x) { 30 #ifdef AMD64 31 address p = (address) &x; 32 return ( (u2(p[0]) << 8 ) | ( u2(p[1])) ); 33 #else 34 __asm { 35 mov ax, x 36 xchg al, ah 37 } 38 // no return statement needed, result is already in ax 39 // compiler warning C4035 disabled via warning pragma 40 #endif // AMD64 41 } 42 43 inline u4 Bytes::swap_u4(u4 x) { 44 #ifdef AMD64 45 address p = (address) &x; 46 return ( (u4(p[0]) << 24) | (u4(p[1]) << 16) | (u4(p[2]) << 8) | u4(p[3])) ; 47 #else 48 __asm { 49 mov eax, x 50 bswap eax 51 } 52 // no return statement needed, result is already in eax 53 // compiler warning C4035 disabled via warning pragma 54 #endif // AMD64 55 } 56 57 #ifdef AMD64 58 inline u8 Bytes::swap_u8(u8 x) { 59 address p = (address) &x; 60 return ( (u8(p[0]) << 56) | (u8(p[1]) << 48) | (u8(p[2]) << 40) | (u8(p[3]) << 32) | 61 (u8(p[4]) << 24) | (u8(p[5]) << 16) | (u8(p[6]) << 8) | u8(p[7])) ; 62 } 63 64 #else 65 // Helper function for swap_u8 66 inline u8 Bytes::swap_u8_base(u4 x, u4 y) { 67 __asm { 68 mov eax, y 69 mov edx, x 70 bswap eax 71 bswap edx 72 } 73 // no return statement needed, result is already in edx:eax 74 // compiler warning C4035 disabled via warning pragma 75 } 76 77 inline u8 Bytes::swap_u8(u8 x) { 78 return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1)); 79 } 80 #endif // AMD64 81 82 #pragma warning(default: 4035) // Enable warning 4035: no return value