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libavcodec
x86
svq1enc.c
Go to the documentation of this file.
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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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#include "config.h"
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#include "
libavutil/attributes.h
"
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#include "
libavutil/cpu.h
"
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#include "
libavutil/x86/asm.h
"
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#include "
libavutil/x86/cpu.h
"
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#include "
libavcodec/svq1enc.h
"
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#if HAVE_INLINE_ASM
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static
int
ssd_int8_vs_int16_mmx(
const
int8_t *pix1,
const
int16_t *pix2,
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int
size
)
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{
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int
sum;
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x86_reg
i =
size
;
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__asm__
volatile
(
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"pxor %%mm4, %%mm4 \n"
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"1: \n"
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"sub $8, %0 \n"
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"movq (%2, %0), %%mm2 \n"
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"movq (%3, %0, 2), %%mm0 \n"
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"movq 8(%3, %0, 2), %%mm1 \n"
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"punpckhbw %%mm2, %%mm3 \n"
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"punpcklbw %%mm2, %%mm2 \n"
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"psraw $8, %%mm3 \n"
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"psraw $8, %%mm2 \n"
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"psubw %%mm3, %%mm1 \n"
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"psubw %%mm2, %%mm0 \n"
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"pmaddwd %%mm1, %%mm1 \n"
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"pmaddwd %%mm0, %%mm0 \n"
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"paddd %%mm1, %%mm4 \n"
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"paddd %%mm0, %%mm4 \n"
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"jg 1b \n"
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"movq %%mm4, %%mm3 \n"
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"psrlq $32, %%mm3 \n"
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"paddd %%mm3, %%mm4 \n"
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"movd %%mm4, %1 \n"
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:
"+r"
(i),
"=r"
(sum)
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:
"r"
(pix1),
"r"
(pix2));
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return
sum;
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}
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#endif
/* HAVE_INLINE_ASM */
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av_cold
void
ff_svq1enc_init_x86
(
SVQ1EncContext
*c)
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{
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#if HAVE_INLINE_ASM
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int
cpu_flags =
av_get_cpu_flags
();
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if
(
INLINE_MMX
(cpu_flags)) {
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c->
ssd_int8_vs_int16
= ssd_int8_vs_int16_mmx;
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}
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#endif
/* HAVE_INLINE_ASM */
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}
size
int size
Definition:
twinvq_data.h:11134
cpu.h
attributes.h
Macro definitions for various function/variable attributes.
svq1enc.h
av_cold
#define av_cold
Definition:
attributes.h:66
x86_reg
int x86_reg
Definition:
asm.h:70
SVQ1EncContext::ssd_int8_vs_int16
int(* ssd_int8_vs_int16)(const int8_t *pix1, const int16_t *pix2, int size)
Definition:
svq1enc.h:71
INLINE_MMX
#define INLINE_MMX(flags)
Definition:
cpu.h:63
asm.h
cpu.h
ff_svq1enc_init_x86
av_cold void ff_svq1enc_init_x86(SVQ1EncContext *c)
Definition:
svq1enc.c:64
av_get_cpu_flags
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition:
cpu.c:47
SVQ1EncContext
Definition:
svq1enc.h:34
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