FFmpeg
vp6dsp_init.c
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1 /*
2  * VP6 MMX/SSE2 optimizations
3  * Copyright (C) 2009 Sebastien Lucas <sebastien.lucas@gmail.com>
4  * Copyright (C) 2009 Zuxy Meng <zuxy.meng@gmail.com>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "libavutil/attributes.h"
24 #include "libavutil/cpu.h"
25 #include "libavutil/x86/cpu.h"
26 #include "libavcodec/vp56dsp.h"
27 
28 void ff_vp6_filter_diag4_mmx(uint8_t *dst, uint8_t *src, ptrdiff_t stride,
29  const int16_t *h_weights,const int16_t *v_weights);
30 void ff_vp6_filter_diag4_sse2(uint8_t *dst, uint8_t *src, ptrdiff_t stride,
31  const int16_t *h_weights,const int16_t *v_weights);
32 
34 {
36 
37 #if ARCH_X86_32
38  if (EXTERNAL_MMX(cpu_flags)) {
40  }
41 #endif
42  if (EXTERNAL_SSE2(cpu_flags)) {
44  }
45 }
#define EXTERNAL_MMX(flags)
Definition: cpu.h:56
static atomic_int cpu_flags
Definition: cpu.c:50
#define src
Definition: vp8dsp.c:254
Macro definitions for various function/variable attributes.
void(* vp6_filter_diag4)(uint8_t *dst, uint8_t *src, ptrdiff_t stride, const int16_t *h_weights, const int16_t *v_weights)
Definition: vp56dsp.h:31
uint8_t
#define av_cold
Definition: attributes.h:82
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
void ff_vp6_filter_diag4_mmx(uint8_t *dst, uint8_t *src, ptrdiff_t stride, const int16_t *h_weights, const int16_t *v_weights)
#define EXTERNAL_SSE2(flags)
Definition: cpu.h:59
void ff_vp6_filter_diag4_sse2(uint8_t *dst, uint8_t *src, ptrdiff_t stride, const int16_t *h_weights, const int16_t *v_weights)
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:93
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
av_cold void ff_vp6dsp_init_x86(VP56DSPContext *c)
Definition: vp6dsp_init.c:33