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1 /*
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2 * simple math operations
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3 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
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4 *
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5 * This file is part of FFmpeg.
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6 *
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7 * FFmpeg is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
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9 * License as published by the Free Software Foundation; either
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10 * version 2.1 of the License, or (at your option) any later version.
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11 *
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12 * FFmpeg is distributed in the hope that it will be useful,
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with FFmpeg; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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20 */
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21
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22 #ifndef AVCODEC_X86_MATHOPS_H
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23 #define AVCODEC_X86_MATHOPS_H
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24
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25 #include "config.h"
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26 #include "libavutil/common.h"
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27
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28 #if ARCH_X86_32
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29 #define MULL(ra, rb, shift) \
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30 ({ int rt, dummy; __asm__ (\
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31 "imull %3 \n\t"\
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32 "shrdl %4, %%edx, %%eax \n\t"\
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33 : "=a"(rt), "=d"(dummy)\
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34 : "a" ((int)ra), "rm" ((int)rb), "i"(shift));\
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35 rt; })
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36
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37 #define MULH(ra, rb) \
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38 ({ int rt, dummy;\
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39 __asm__ ("imull %3\n\t" : "=d"(rt), "=a"(dummy): "a" ((int)ra), "rm" ((int)rb));\
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40 rt; })
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41
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42 #define MUL64(ra, rb) \
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43 ({ int64_t rt;\
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44 __asm__ ("imull %2\n\t" : "=A"(rt) : "a" ((int)ra), "g" ((int)rb));\
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45 rt; })
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46 #endif
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47
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48 // avoid +32 for shift optimization (gcc should do that ...)
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49 #define NEG_SSR32 NEG_SSR32
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50 static inline int32_t NEG_SSR32( int32_t a, int8_t s){
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51 __asm__ ("sarl %1, %0\n\t"
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52 : "+r" (a)
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53 : "ic" ((uint8_t)(-s))
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54 );
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55 return a;
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56 }
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57
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58 #define NEG_USR32 NEG_USR32
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59 static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
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60 __asm__ ("shrl %1, %0\n\t"
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61 : "+r" (a)
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62 : "ic" ((uint8_t)(-s))
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63 );
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64 return a;
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65 }
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66
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67 #endif /* AVCODEC_X86_MATHOPS_H */
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