FFmpeg
videodsp_init.c
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1 /*
2  * Copyright (c) 2017 Kaustubh Raste (kaustubh.raste@imgtec.com)
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/mips/cpu.h"
22 #include "config.h"
23 #include "libavutil/attributes.h"
24 #include "libavutil/mips/asmdefs.h"
25 #include "libavcodec/videodsp.h"
26 
27 static void prefetch_mips(const uint8_t *mem, ptrdiff_t stride, int h)
28 {
29  register const uint8_t *p = mem;
30 
31  __asm__ volatile (
32  "1: \n\t"
33  "pref 4, 0(%[p]) \n\t"
34  "pref 4, 32(%[p]) \n\t"
35  PTR_ADDIU" %[h], %[h], -1 \n\t"
36  PTR_ADDU " %[p], %[p], %[stride] \n\t"
37 
38  "bnez %[h], 1b \n\t"
39 
40  : [p] "+r" (p), [h] "+r" (h)
41  : [stride] "r" (stride)
42  );
43 }
44 
46 {
48 
49  if (have_msa(cpu_flags))
50  ctx->prefetch = prefetch_mips;
51 }
asmdefs.h
av_get_cpu_flags
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:109
cpu_flags
static atomic_int cpu_flags
Definition: cpu.c:56
prefetch_mips
static void prefetch_mips(const uint8_t *mem, ptrdiff_t stride, int h)
Definition: videodsp_init.c:27
av_cold
#define av_cold
Definition: attributes.h:90
have_msa
#define have_msa(flags)
Definition: cpu.h:26
ctx
AVFormatContext * ctx
Definition: movenc.c:49
attributes.h
stride
#define stride
Definition: h264pred_template.c:537
__asm__
__asm__(".macro parse_r var r\n\t" "\\var = -1\n\t" _IFC_REG(0) _IFC_REG(1) _IFC_REG(2) _IFC_REG(3) _IFC_REG(4) _IFC_REG(5) _IFC_REG(6) _IFC_REG(7) _IFC_REG(8) _IFC_REG(9) _IFC_REG(10) _IFC_REG(11) _IFC_REG(12) _IFC_REG(13) _IFC_REG(14) _IFC_REG(15) _IFC_REG(16) _IFC_REG(17) _IFC_REG(18) _IFC_REG(19) _IFC_REG(20) _IFC_REG(21) _IFC_REG(22) _IFC_REG(23) _IFC_REG(24) _IFC_REG(25) _IFC_REG(26) _IFC_REG(27) _IFC_REG(28) _IFC_REG(29) _IFC_REG(30) _IFC_REG(31) ".iflt \\var\n\t" ".error \"Unable to parse register name \\r\"\n\t" ".endif\n\t" ".endm")
PTR_ADDU
#define PTR_ADDU
Definition: asmdefs.h:49
PTR_ADDIU
#define PTR_ADDIU
Definition: asmdefs.h:50
VideoDSPContext
Definition: videodsp.h:40
ff_videodsp_init_mips
av_cold void ff_videodsp_init_mips(VideoDSPContext *ctx, int bpc)
Definition: videodsp_init.c:45
videodsp.h
cpu.h
h
h
Definition: vp9dsp_template.c:2070