arm: Add an option for making sure NEON registers aren't clobbered
[ffmpeg.git] / libavutil / arm / neontest.h
1 /*
2  * check NEON registers for clobbering
3  * Copyright (c) 2008 Ramiro Polla <ramiro.polla@gmail.com>
4  * Copyright (c) 2013 Martin Storsjo
5  *
6  * This file is part of Libav.
7  *
8  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 #include <inttypes.h>
24 #include <stdint.h>
25 #include <stdlib.h>
26 #include <stdarg.h>
27 #include <string.h>
28
29 #include "libavutil/bswap.h"
30
31 #define storeneonregs(mem)                \
32     __asm__ volatile(                     \
33         "vstm %0, {d8-d15}\n\t"           \
34         :: "r"(mem) : "memory")
35
36 #define testneonclobbers(func, ctx, ...)                        \
37     uint64_t neon[2][8];                                        \
38     int ret;                                                    \
39     storeneonregs(neon[0]);                                     \
40     ret = __real_ ## func(ctx, __VA_ARGS__);                    \
41     storeneonregs(neon[1]);                                     \
42     if (memcmp(neon[0], neon[1], sizeof(neon[0]))) {            \
43         int i;                                                  \
44         av_log(ctx, AV_LOG_ERROR,                               \
45                "NEON REGS CLOBBERED IN %s!\n", #func);          \
46         for (i = 0; i < 8; i ++)                                \
47             if (neon[0][i] != neon[1][i]) {                     \
48                 av_log(ctx, AV_LOG_ERROR,                       \
49                        "d%-2d = %016"PRIx64"\n",                \
50                        8 + i, av_bswap64(neon[0][i]));          \
51                 av_log(ctx, AV_LOG_ERROR,                       \
52                        "   -> %016"PRIx64"\n",                  \
53                        av_bswap64(neon[1][i]));                 \
54             }                                                   \
55         abort();                                                \
56     }                                                           \
57     return ret
58
59 #define wrap(func)      \
60 int __real_ ## func;    \
61 int __wrap_ ## func;    \
62 int __wrap_ ## func