intrinsics.h 2.5 KB

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  1. /* Copyright (C) 2010-2018 The RetroArch team
  2. *
  3. * ---------------------------------------------------------------------------------------
  4. * The following license statement only applies to this file (intrinsics.h).
  5. * ---------------------------------------------------------------------------------------
  6. *
  7. * Permission is hereby granted, free of charge,
  8. * to any person obtaining a copy of this software and associated documentation files (the "Software"),
  9. * to deal in the Software without restriction, including without limitation the rights to
  10. * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
  11. * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
  12. *
  13. * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
  14. *
  15. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
  16. * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17. * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  18. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  19. * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20. * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  21. */
  22. #ifndef __LIBRETRO_SDK_COMPAT_INTRINSICS_H
  23. #define __LIBRETRO_SDK_COMPAT_INTRINSICS_H
  24. #include <stdint.h>
  25. #include <stddef.h>
  26. #include <string.h>
  27. #include <retro_common_api.h>
  28. #include <retro_inline.h>
  29. #if defined(_MSC_VER) && !defined(_XBOX)
  30. #if (_MSC_VER > 1310)
  31. #include <intrin.h>
  32. #endif
  33. #endif
  34. RETRO_BEGIN_DECLS
  35. /* Count Leading Zero, unsigned 16bit input value */
  36. static INLINE unsigned compat_clz_u16(uint16_t val)
  37. {
  38. #if defined(__GNUC__) && !defined(PS2)
  39. return __builtin_clz(val << 16 | 0x8000);
  40. #else
  41. unsigned ret = 0;
  42. while(!(val & 0x8000) && ret < 16)
  43. {
  44. val <<= 1;
  45. ret++;
  46. }
  47. return ret;
  48. #endif
  49. }
  50. /* Count Trailing Zero */
  51. static INLINE int compat_ctz(unsigned x)
  52. {
  53. #if defined(__GNUC__) && !defined(RARCH_CONSOLE)
  54. return __builtin_ctz(x);
  55. #elif _MSC_VER >= 1400 && !defined(_XBOX) && !defined(__WINRT__)
  56. unsigned long r = 0;
  57. _BitScanReverse((unsigned long*)&r, x);
  58. return (int)r;
  59. #else
  60. /* Only checks at nibble granularity,
  61. * because that's what we need. */
  62. if (x & 0x000f)
  63. return 0;
  64. if (x & 0x00f0)
  65. return 4;
  66. if (x & 0x0f00)
  67. return 8;
  68. if (x & 0xf000)
  69. return 12;
  70. return 16;
  71. #endif
  72. }
  73. RETRO_END_DECLS
  74. #endif