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 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 <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