a06a5b78e2
The volatile is not required here, and prevents a miscompilation with GCC 4.8.1 when building on x86 with --cpu=i686 Signed-off-by: Michael Niedermayer <michaelni@gmx.at> Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
129 lines
3.1 KiB
C
129 lines
3.1 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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 HAVE_INLINE_ASM
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#if ARCH_X86_32
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#define MULL MULL
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static av_always_inline av_const int MULL(int a, int b, unsigned shift)
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{
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int rt, dummy;
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__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"(a), "rm"(b), "ci"((uint8_t)shift)
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);
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return rt;
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}
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#define MULH MULH
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static av_always_inline av_const int MULH(int a, int b)
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{
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int rt, dummy;
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__asm__ (
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"imull %3"
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:"=d"(rt), "=a"(dummy)
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:"a"(a), "rm"(b)
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);
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return rt;
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}
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#define MUL64 MUL64
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static av_always_inline av_const int64_t MUL64(int a, int b)
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{
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int64_t rt;
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__asm__ (
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"imull %2"
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:"=A"(rt)
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:"a"(a), "rm"(b)
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);
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return rt;
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}
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#endif /* ARCH_X86_32 */
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#if HAVE_I686
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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__ (
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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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#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 /* HAVE_I686 */
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#define MASK_ABS(mask, level) \
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__asm__ ("cltd \n\t" \
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"xorl %1, %0 \n\t" \
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"subl %1, %0 \n\t" \
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: "+a"(level), "=&d"(mask))
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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 /* HAVE_INLINE_ASM */
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#endif /* AVCODEC_X86_MATHOPS_H */
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