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1 /*
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2 * This file is part of FFmpeg.
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3 *
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4 * FFmpeg is free software; you can redistribute it and/or
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5 * modify it under the terms of the GNU Lesser General Public
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6 * License as published by the Free Software Foundation; either
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7 * version 2.1 of the License, or (at your option) any later version.
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8 *
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9 * FFmpeg is distributed in the hope that it will be useful,
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10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 * Lesser General Public License for more details.
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13 *
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14 * You should have received a copy of the GNU Lesser General Public
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15 * License along with FFmpeg; if not, write to the Free Software
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16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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17 */
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18
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19 /**
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20 * @file
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21 * byte swapping routines
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22 */
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23
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24 #ifndef AVUTIL_X86_BSWAP_H
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25 #define AVUTIL_X86_BSWAP_H
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26
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27 #include <stdint.h>
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28 #include "config.h"
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29 #include "libavutil/attributes.h"
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30
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31 #define bswap_16 bswap_16
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32 static av_always_inline av_const uint16_t bswap_16(uint16_t x)
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33 {
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34 __asm__("rorw $8, %0" : "+r"(x));
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35 return x;
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36 }
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37
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38 #define bswap_32 bswap_32
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39 static av_always_inline av_const uint32_t bswap_32(uint32_t x)
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40 {
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41 // #if HAVE_BSWAP
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42 __asm__("bswap %0" : "+r" (x));
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43 // #else
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44 // __asm__("rorw $8, %w0 \n\t"
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45 // "rorl $16, %0 \n\t"
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46 // "rorw $8, %w0"
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47 // : "+r"(x));
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48 // #endif
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49 return x;
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50 }
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51
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52 #if ARCH_X86_64
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53 #define bswap_64 bswap_64
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54 static inline uint64_t av_const bswap_64(uint64_t x)
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55 {
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56 __asm__("bswap %0": "=r" (x) : "0" (x));
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57 return x;
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58 }
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59 #endif
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60
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61 #endif /* AVUTIL_X86_BSWAP_H */
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