ffmpeg/libavutil/ppc/intreadwrite.h

   1 /*
   2  * Copyright (c) 2008 Mans Rullgard <mans@mansr.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 #ifndef AVUTIL_PPC_INTREADWRITE_H
  22 #define AVUTIL_PPC_INTREADWRITE_H
  23
  24 #include <stdint.h>
  25 #include "config.h"
  26
  27 /*
  28  * -O0 would compile the packed struct version, which is used by
  29  * default, in an overly verbose fashion, so we override it here.
  30  */
  31 #if HAVE_BIGENDIAN
  32 #define AV_RB64(p) (*(const uint64_t *)(p))
  33 #define AV_WB64(p, v) (*(uint64_t *)(p) = (v))
  34
  35 #else
  36 #define AV_RL64(p) (*(const uint64_t *)(p))
  37 #define AV_WL64(p, v) (*(uint64_t *)(p) = (v))
  38
  39 #endif
  40
  41 #if HAVE_XFORM_ASM
  42
  43 #if HAVE_BIGENDIAN
  44 #define AV_RL16 av_read_bswap16
  45 #define AV_WL16 av_write_bswap16
  46 #define AV_RL32 av_read_bswap32
  47 #define AV_WL32 av_write_bswap32
  48 #define AV_RL64 av_read_bswap64
  49 #define AV_WL64 av_write_bswap64
  50
  51 #else
  52 #define AV_RB16 av_read_bswap16
  53 #define AV_WB16 av_write_bswap16
  54 #define AV_RB32 av_read_bswap32
  55 #define AV_WB32 av_write_bswap32
  56 #define AV_RB64 av_read_bswap64
  57 #define AV_WB64 av_write_bswap64
  58
  59 #endif
  60
  61 static av_always_inline uint16_t av_read_bswap16(const void *p)
  62 {
  63     uint16_t v;
  64     __asm__ ("lhbrx   %0, %y1" : "=r"(v) : "Z"(*(const uint16_t*)p));
  65     return v;
  66 }
  67
  68 static av_always_inline void av_write_bswap16(void *p, uint16_t v)
  69 {
  70     __asm__ ("sthbrx  %1, %y0" : "=Z"(*(uint16_t*)p) : "r"(v));
  71 }
  72
  73 static av_always_inline uint32_t av_read_bswap32(const void *p)
  74 {
  75     uint32_t v;
  76     __asm__ ("lwbrx   %0, %y1" : "=r"(v) : "Z"(*(const uint32_t*)p));
  77     return v;
  78 }
  79
  80 static av_always_inline void av_write_bswap32(void *p, uint32_t v)
  81 {
  82     __asm__ ("stwbrx  %1, %y0" : "=Z"(*(uint32_t*)p) : "r"(v));
  83 }
  84
  85 #if HAVE_LDBRX
  86
  87 static av_always_inline uint64_t av_read_bswap64(const void *p)
  88 {
  89     uint64_t v;
  90     __asm__ ("ldbrx   %0, %y1" : "=r"(v) : "Z"(*(const uint64_t*)p));
  91     return v;
  92 }
  93
  94 static av_always_inline void av_write_bswap64(void *p, uint64_t v)
  95 {
  96     __asm__ ("stdbrx  %1, %y0" : "=Z"(*(uint64_t*)p) : "r"(v));
  97 }
  98
  99 #else
 100
 101 static av_always_inline uint64_t av_read_bswap64(const void *p)
 102 {
 103     union { uint64_t v; uint32_t hl[2]; } v;
 104     __asm__ ("lwbrx   %0, %y2  \n\t"
 105              "lwbrx   %1, %y3  \n\t"
 106              : "=&r"(v.hl[1]), "=r"(v.hl[0])
 107              : "Z"(*(const uint32_t*)p), "Z"(*((const uint32_t*)p+1)));
 108     return v.v;
 109 }
 110
 111 static av_always_inline void av_write_bswap64(void *p, uint64_t v)
 112 {
 113     union { uint64_t v; uint32_t hl[2]; } vv = { v };
 114     __asm__ ("stwbrx  %2, %y0  \n\t"
 115              "stwbrx  %3, %y1  \n\t"
 116              : "=Z"(*(uint32_t*)p), "=Z"(*((uint32_t*)p+1))
 117              : "r"(vv.hl[1]), "r"(vv.hl[0]));
 118 }
 119
 120 #endif /* HAVE_LDBRX */
 121
 122 #endif /* HAVE_XFORM_ASM */
 123
 124 #endif /* AVUTIL_PPC_INTREADWRITE_H */