mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
/*
|
|
* simple math operations
|
|
* Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* Libav is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVCODEC_X86_MATHOPS_H
|
|
#define AVCODEC_X86_MATHOPS_H
|
|
|
|
#include "config.h"
|
|
#include "libavutil/common.h"
|
|
|
|
#if ARCH_X86_32
|
|
|
|
#define MULL MULL
|
|
static av_always_inline av_const int MULL(int a, int b, unsigned shift)
|
|
{
|
|
int rt, dummy;
|
|
__asm__ (
|
|
"imull %3 \n\t"
|
|
"shrdl %4, %%edx, %%eax \n\t"
|
|
:"=a"(rt), "=d"(dummy)
|
|
:"a"(a), "rm"(b), "ci"((uint8_t)shift)
|
|
);
|
|
return rt;
|
|
}
|
|
|
|
#define MULH MULH
|
|
static av_always_inline av_const int MULH(int a, int b)
|
|
{
|
|
int rt, dummy;
|
|
__asm__ (
|
|
"imull %3"
|
|
:"=d"(rt), "=a"(dummy)
|
|
:"a"(a), "rm"(b)
|
|
);
|
|
return rt;
|
|
}
|
|
|
|
#define MUL64 MUL64
|
|
static av_always_inline av_const int64_t MUL64(int a, int b)
|
|
{
|
|
int64_t rt;
|
|
__asm__ (
|
|
"imull %2"
|
|
:"=A"(rt)
|
|
:"a"(a), "rm"(b)
|
|
);
|
|
return rt;
|
|
}
|
|
|
|
#endif /* ARCH_X86_32 */
|
|
|
|
#if HAVE_CMOV
|
|
/* median of 3 */
|
|
#define mid_pred mid_pred
|
|
static inline av_const int mid_pred(int a, int b, int c)
|
|
{
|
|
int i=b;
|
|
__asm__ volatile(
|
|
"cmp %2, %1 \n\t"
|
|
"cmovg %1, %0 \n\t"
|
|
"cmovg %2, %1 \n\t"
|
|
"cmp %3, %1 \n\t"
|
|
"cmovl %3, %1 \n\t"
|
|
"cmp %1, %0 \n\t"
|
|
"cmovg %1, %0 \n\t"
|
|
:"+&r"(i), "+&r"(a)
|
|
:"r"(b), "r"(c)
|
|
);
|
|
return i;
|
|
}
|
|
#endif
|
|
|
|
#if HAVE_CMOV
|
|
#define COPY3_IF_LT(x, y, a, b, c, d)\
|
|
__asm__ volatile(\
|
|
"cmpl %0, %3 \n\t"\
|
|
"cmovl %3, %0 \n\t"\
|
|
"cmovl %4, %1 \n\t"\
|
|
"cmovl %5, %2 \n\t"\
|
|
: "+&r" (x), "+&r" (a), "+r" (c)\
|
|
: "r" (y), "r" (b), "r" (d)\
|
|
);
|
|
#endif
|
|
|
|
// avoid +32 for shift optimization (gcc should do that ...)
|
|
#define NEG_SSR32 NEG_SSR32
|
|
static inline int32_t NEG_SSR32( int32_t a, int8_t s){
|
|
__asm__ ("sarl %1, %0\n\t"
|
|
: "+r" (a)
|
|
: "ic" ((uint8_t)(-s))
|
|
);
|
|
return a;
|
|
}
|
|
|
|
#define NEG_USR32 NEG_USR32
|
|
static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
|
|
__asm__ ("shrl %1, %0\n\t"
|
|
: "+r" (a)
|
|
: "ic" ((uint8_t)(-s))
|
|
);
|
|
return a;
|
|
}
|
|
|
|
#endif /* AVCODEC_X86_MATHOPS_H */
|