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 "config.h"
22 #include "libavutil/attributes.h"
23 #include "libavutil/mips/asmdefs.h"
24 #include "libavcodec/videodsp.h"
25 
26 #if HAVE_MSA
27 static void prefetch_mips(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 #endif // #if HAVE_MSA
45 
47 {
48 #if HAVE_MSA
49  ctx->prefetch = prefetch_mips;
50 #endif // #if HAVE_MSA
51 }
MIPS assembly defines from sys/asm.h but rewritten for use with C inline assembly (rather than from w...
void(* prefetch)(uint8_t *buf, ptrdiff_t stride, int h)
Prefetch memory into cache (if supported by hardware).
Definition: videodsp.h:76
Macro definitions for various function/variable attributes.
int mem
Definition: avisynth_c.h:916
uint8_t
#define av_cold
Definition: attributes.h:82
AVFormatContext * ctx
Definition: movenc.c:48
av_cold void ff_videodsp_init_mips(VideoDSPContext *ctx, int bpc)
Definition: videodsp_init.c:46
#define PTR_ADDIU
Definition: asmdefs.h:48
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:104
Core video DSP helper functions.
#define PTR_ADDU
Definition: asmdefs.h:47
#define stride