mirror of
https://github.com/FFmpeg/FFmpeg.git
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101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
/*
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* simple math operations
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* Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_X86_MATHOPS_H
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#define AVCODEC_X86_MATHOPS_H
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#include "config.h"
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#include "libavutil/common.h"
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#if ARCH_X86_32
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#define MULL(ra, rb, shift) \
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({ int rt, dummy; __asm__ (\
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"imull %3 \n\t"\
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"shrdl %4, %%edx, %%eax \n\t"\
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: "=a"(rt), "=d"(dummy)\
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: "a" ((int)ra), "rm" ((int)rb), "i"(shift));\
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rt; })
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#define MULH(ra, rb) \
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({ int rt, dummy;\
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__asm__ ("imull %3\n\t" : "=d"(rt), "=a"(dummy): "a" ((int)ra), "rm" ((int)rb));\
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rt; })
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#define MUL64(ra, rb) \
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({ int64_t rt;\
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__asm__ ("imull %2\n\t" : "=A"(rt) : "a" ((int)ra), "g" ((int)rb));\
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rt; })
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#endif
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#if HAVE_CMOV
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/* median of 3 */
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#define mid_pred mid_pred
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static inline av_const int mid_pred(int a, int b, int c)
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{
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int i=b;
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__asm__ volatile(
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"cmp %2, %1 \n\t"
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"cmovg %1, %0 \n\t"
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"cmovg %2, %1 \n\t"
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"cmp %3, %1 \n\t"
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"cmovl %3, %1 \n\t"
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"cmp %1, %0 \n\t"
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"cmovg %1, %0 \n\t"
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:"+&r"(i), "+&r"(a)
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:"r"(b), "r"(c)
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);
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return i;
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}
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#endif
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#if HAVE_CMOV
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#define COPY3_IF_LT(x, y, a, b, c, d)\
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__asm__ volatile(\
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"cmpl %0, %3 \n\t"\
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"cmovl %3, %0 \n\t"\
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"cmovl %4, %1 \n\t"\
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"cmovl %5, %2 \n\t"\
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: "+&r" (x), "+&r" (a), "+r" (c)\
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: "r" (y), "r" (b), "r" (d)\
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);
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#endif
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// avoid +32 for shift optimization (gcc should do that ...)
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#define NEG_SSR32 NEG_SSR32
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static inline int32_t NEG_SSR32( int32_t a, int8_t s){
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__asm__ ("sarl %1, %0\n\t"
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: "+r" (a)
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: "ic" ((uint8_t)(-s))
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);
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return a;
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}
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#define NEG_USR32 NEG_USR32
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static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
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__asm__ ("shrl %1, %0\n\t"
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: "+r" (a)
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: "ic" ((uint8_t)(-s))
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);
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return a;
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}
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#endif /* AVCODEC_X86_MATHOPS_H */
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