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
prefetch_mips(uint8_t * mem,ptrdiff_t stride,int h)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
ff_videodsp_init_mips(VideoDSPContext * ctx,int bpc)45 av_cold void ff_videodsp_init_mips(VideoDSPContext *ctx, int bpc)
46 {
47 int cpu_flags = av_get_cpu_flags();
48
49 if (have_msa(cpu_flags))
50 ctx->prefetch = prefetch_mips;
51 }
52