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author | 2021-06-21 13:53:49 -0700 | |
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committer | 2021-06-21 13:53:49 -0700 | |
commit | 32dbba7d2d4513774b2d877b4c88f2d0760bcf54 (patch) | |
tree | f9e6426cf8dc28413c456bdbcd450c85cb302422 /src/osd/eivc.h | |
parent | 5522729235b3ce81c839f3932c1aadc14de59e2b (diff) | |
parent | 2709c0143a8c7009715242c135b28403eeffce8b (diff) |
Merge branch 'master' into deprecateddeprecated
Diffstat (limited to 'src/osd/eivc.h')
-rw-r--r-- | src/osd/eivc.h | 57 |
1 files changed, 49 insertions, 8 deletions
diff --git a/src/osd/eivc.h b/src/osd/eivc.h index 56d1dcc3ab8..2ffd0e7633b 100644 --- a/src/osd/eivc.h +++ b/src/osd/eivc.h @@ -15,6 +15,9 @@ #include <intrin.h> #pragma intrinsic(_BitScanReverse) +#ifdef PTR64 +#pragma intrinsic(_BitScanReverse64) +#endif /*************************************************************************** @@ -22,13 +25,13 @@ ***************************************************************************/ /*------------------------------------------------- - count_leading_zeros - return the number of + count_leading_zeros_32 - return the number of leading zero bits in a 32-bit value -------------------------------------------------*/ -#ifndef count_leading_zeros -#define count_leading_zeros _count_leading_zeros -__forceinline uint8_t _count_leading_zeros(uint32_t value) +#ifndef count_leading_zeros_32 +#define count_leading_zeros_32 _count_leading_zeros_32 +__forceinline uint8_t _count_leading_zeros_32(uint32_t value) { unsigned long index; return _BitScanReverse(&index, value) ? (31U - index) : 32U; @@ -37,17 +40,55 @@ __forceinline uint8_t _count_leading_zeros(uint32_t value) /*------------------------------------------------- - count_leading_ones - return the number of + count_leading_ones_32 - return the number of leading one bits in a 32-bit value -------------------------------------------------*/ -#ifndef count_leading_ones -#define count_leading_ones _count_leading_ones -__forceinline uint8_t _count_leading_ones(uint32_t value) +#ifndef count_leading_ones_32 +#define count_leading_ones_32 _count_leading_ones_32 +__forceinline uint8_t _count_leading_ones_32(uint32_t value) { unsigned long index; return _BitScanReverse(&index, ~value) ? (31U - index) : 32U; } #endif + +/*------------------------------------------------- + count_leading_zeros_64 - return the number of + leading zero bits in a 64-bit value +-------------------------------------------------*/ + +#ifndef count_leading_zeros_64 +#define count_leading_zeros_64 _count_leading_zeros_64 +__forceinline uint8_t _count_leading_zeros_64(uint64_t value) +{ + unsigned long index; +#ifdef PTR64 + return _BitScanReverse64(&index, value) ? (63U - index) : 64U; +#else + return _BitScanReverse(&index, uint32_t(value >> 32)) ? (31U - index) : _BitScanReverse(&index, uint32_t(value)) ? (63U - index) : 64U; +#endif +} +#endif + + +/*------------------------------------------------- + count_leading_ones_64 - return the number of + leading one bits in a 64-bit value +-------------------------------------------------*/ + +#ifndef count_leading_ones_64 +#define count_leading_ones_64 _count_leading_ones_64 +__forceinline uint8_t _count_leading_ones_64(uint64_t value) +{ + unsigned long index; +#ifdef PTR64 + return _BitScanReverse64(&index, ~value) ? (63U - index) : 64U; +#else + return _BitScanReverse(&index, ~uint32_t(value >> 32)) ? (31U - index) : _BitScanReverse(&index, ~uint32_t(value)) ? (63U - index) : 64U; +#endif +} +#endif + #endif // MAME_OSD_EIVC_H |