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  1. /*
  2.  * This file is part of FFmpeg.
  3.  *
  4.  * FFmpeg is free software; you can redistribute it and/or
  5.  * modify it under the terms of the GNU Lesser General Public
  6.  * License as published by the Free Software Foundation; either
  7.  * version 2.1 of the License, or (at your option) any later version.
  8.  *
  9.  * FFmpeg is distributed in the hope that it will be useful,
  10.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12.  * Lesser General Public License for more details.
  13.  *
  14.  * You should have received a copy of the GNU Lesser General Public
  15.  * License along with FFmpeg; if not, write to the Free Software
  16.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17.  */
  18.  
  19. #ifndef AVUTIL_ARM_INTREADWRITE_H
  20. #define AVUTIL_ARM_INTREADWRITE_H
  21.  
  22. #include <stdint.h>
  23. #include "config.h"
  24. #include "libavutil/attributes.h"
  25.  
  26. #if HAVE_FAST_UNALIGNED && HAVE_INLINE_ASM && !AV_GCC_VERSION_AT_LEAST(4,7)
  27.  
  28. #define AV_RN16 AV_RN16
  29. static av_always_inline unsigned AV_RN16(const void *p)
  30. {
  31.     const uint8_t *q = p;
  32.     unsigned v;
  33. #if !AV_GCC_VERSION_AT_LEAST(4,6)
  34.     __asm__ ("ldrh %0, %1" : "=r"(v) : "m"(*(const uint16_t *)q));
  35. #elif defined __thumb__
  36.     __asm__ ("ldrh %0, %1" : "=r"(v) : "m"(q[0]), "m"(q[1]));
  37. #else
  38.     __asm__ ("ldrh %0, %1" : "=r"(v) : "Uq"(q[0]), "m"(q[1]));
  39. #endif
  40.     return v;
  41. }
  42.  
  43. #define AV_WN16 AV_WN16
  44. static av_always_inline void AV_WN16(void *p, uint16_t v)
  45. {
  46.     __asm__ ("strh %1, %0" : "=m"(*(uint16_t *)p) : "r"(v));
  47. }
  48.  
  49. #define AV_RN32 AV_RN32
  50. static av_always_inline uint32_t AV_RN32(const void *p)
  51. {
  52.     const struct __attribute__((packed)) { uint32_t v; } *q = p;
  53.     uint32_t v;
  54.     __asm__ ("ldr  %0, %1" : "=r"(v) : "m"(*q));
  55.     return v;
  56. }
  57.  
  58. #define AV_WN32 AV_WN32
  59. static av_always_inline void AV_WN32(void *p, uint32_t v)
  60. {
  61.     __asm__ ("str  %1, %0" : "=m"(*(uint32_t *)p) : "r"(v));
  62. }
  63.  
  64. #if HAVE_ASM_MOD_Q
  65.  
  66. #define AV_RN64 AV_RN64
  67. static av_always_inline uint64_t AV_RN64(const void *p)
  68. {
  69.     const struct __attribute__((packed)) { uint32_t v; } *q = p;
  70.     uint64_t v;
  71.     __asm__ ("ldr   %Q0, %1  \n\t"
  72.              "ldr   %R0, %2  \n\t"
  73.              : "=&r"(v)
  74.              : "m"(q[0]), "m"(q[1]));
  75.     return v;
  76. }
  77.  
  78. #define AV_WN64 AV_WN64
  79. static av_always_inline void AV_WN64(void *p, uint64_t v)
  80. {
  81.     __asm__ ("str  %Q2, %0  \n\t"
  82.              "str  %R2, %1  \n\t"
  83.              : "=m"(*(uint32_t*)p), "=m"(*((uint32_t*)p+1))
  84.              : "r"(v));
  85. }
  86.  
  87. #endif /* HAVE_ASM_MOD_Q */
  88.  
  89. #endif /* HAVE_INLINE_ASM */
  90.  
  91. #endif /* AVUTIL_ARM_INTREADWRITE_H */
  92.