FFmpeg
bswapdsp_init.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include <stdint.h>
20 
21 #include "libavutil/attributes.h"
22 #include "libavutil/cpu.h"
23 #include "libavutil/x86/cpu.h"
24 #include "libavcodec/bswapdsp.h"
25 
26 void ff_bswap32_buf_sse2(uint32_t *dst, const uint32_t *src, int w);
27 void ff_bswap32_buf_ssse3(uint32_t *dst, const uint32_t *src, int w);
28 void ff_bswap32_buf_avx2(uint32_t *dst, const uint32_t *src, int w);
29 
31 {
33 
35  c->bswap_buf = ff_bswap32_buf_sse2;
37  c->bswap_buf = ff_bswap32_buf_ssse3;
39  c->bswap_buf = ff_bswap32_buf_avx2;
40 }
bswapdsp.h
cpu.h
EXTERNAL_AVX2_FAST
#define EXTERNAL_AVX2_FAST(flags)
Definition: cpu.h:79
w
uint8_t w
Definition: llviddspenc.c:38
av_get_cpu_flags
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:96
cpu_flags
static atomic_int cpu_flags
Definition: cpu.c:50
av_cold
#define av_cold
Definition: attributes.h:90
ff_bswap32_buf_avx2
void ff_bswap32_buf_avx2(uint32_t *dst, const uint32_t *src, int w)
ff_bswapdsp_init_x86
av_cold void ff_bswapdsp_init_x86(BswapDSPContext *c)
Definition: bswapdsp_init.c:30
src
#define src
Definition: vp8dsp.c:255
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
cpu.h
attributes.h
EXTERNAL_SSE2
#define EXTERNAL_SSE2(flags)
Definition: cpu.h:59
ff_bswap32_buf_sse2
void ff_bswap32_buf_sse2(uint32_t *dst, const uint32_t *src, int w)
ff_bswap32_buf_ssse3
void ff_bswap32_buf_ssse3(uint32_t *dst, const uint32_t *src, int w)
BswapDSPContext
Definition: bswapdsp.h:24
EXTERNAL_SSSE3
#define EXTERNAL_SSSE3(flags)
Definition: cpu.h:65