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1 /*
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2 * Copyright 1998 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #pragma warning(disable: 4035) // Disable warning 4035: no return value
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26
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27 // Efficient swapping of data bytes from Java byte
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28 // ordering to native byte ordering and vice versa.
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29 inline u2 Bytes::swap_u2(u2 x) {
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30 #ifdef AMD64
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31 address p = (address) &x;
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32 return ( (u2(p[0]) << 8 ) | ( u2(p[1])) );
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33 #else
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34 __asm {
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35 mov ax, x
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36 xchg al, ah
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37 }
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38 // no return statement needed, result is already in ax
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39 // compiler warning C4035 disabled via warning pragma
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40 #endif // AMD64
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41 }
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42
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43 inline u4 Bytes::swap_u4(u4 x) {
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44 #ifdef AMD64
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45 address p = (address) &x;
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46 return ( (u4(p[0]) << 24) | (u4(p[1]) << 16) | (u4(p[2]) << 8) | u4(p[3])) ;
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47 #else
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48 __asm {
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49 mov eax, x
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50 bswap eax
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51 }
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52 // no return statement needed, result is already in eax
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53 // compiler warning C4035 disabled via warning pragma
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54 #endif // AMD64
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55 }
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56
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57 #ifdef AMD64
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58 inline u8 Bytes::swap_u8(u8 x) {
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59 address p = (address) &x;
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60 return ( (u8(p[0]) << 56) | (u8(p[1]) << 48) | (u8(p[2]) << 40) | (u8(p[3]) << 32) |
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61 (u8(p[4]) << 24) | (u8(p[5]) << 16) | (u8(p[6]) << 8) | u8(p[7])) ;
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62 }
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63
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64 #else
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65 // Helper function for swap_u8
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66 inline u8 Bytes::swap_u8_base(u4 x, u4 y) {
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67 __asm {
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68 mov eax, y
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69 mov edx, x
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70 bswap eax
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71 bswap edx
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72 }
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73 // no return statement needed, result is already in edx:eax
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74 // compiler warning C4035 disabled via warning pragma
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75 }
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76
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77 inline u8 Bytes::swap_u8(u8 x) {
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78 return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));
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79 }
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80 #endif // AMD64
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81
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82 #pragma warning(default: 4035) // Enable warning 4035: no return value
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