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1 /*
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2 * Copyright 1999-2001 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 #include <byteswap.h>
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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 return bswap_16(x);
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32 #else
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33 u2 ret;
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34 __asm__ __volatile__ (
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35 "movw %0, %%ax;"
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36 "xchg %%al, %%ah;"
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37 "movw %%ax, %0"
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38 :"=r" (ret) // output : register 0 => ret
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39 :"0" (x) // input : x => register 0
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40 :"ax", "0" // clobbered registers
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41 );
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42 return ret;
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43 #endif // AMD64
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44 }
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45
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46 inline u4 Bytes::swap_u4(u4 x) {
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47 #ifdef AMD64
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48 return bswap_32(x);
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49 #else
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50 u4 ret;
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51 __asm__ __volatile__ (
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52 "bswap %0"
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53 :"=r" (ret) // output : register 0 => ret
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54 :"0" (x) // input : x => register 0
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55 :"0" // clobbered register
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56 );
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57 return ret;
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58 #endif // AMD64
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59 }
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60
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61 #ifdef AMD64
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62 inline u8 Bytes::swap_u8(u8 x) {
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63 return bswap_64(x);
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64 }
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65 #else
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66 // Helper function for swap_u8
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67 inline u8 Bytes::swap_u8_base(u4 x, u4 y) {
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68 return (((u8)swap_u4(x))<<32) | swap_u4(y);
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69 }
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70
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71 inline u8 Bytes::swap_u8(u8 x) {
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72 return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));
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73 }
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74 #endif // !AMD64
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