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plugins/obs-outputs/utils.h
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thirumalai-qcom
obs-outputs: Use _CountTrailingZeros() in ctz32 for ARM64
01 мар 2025, 00:29
01 мар 2025, 00:29
6862de6
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#pragma once #if defined(__GNUC__) || defined(__clang__) static inline uint32_t clz32(unsigned long val) { return __builtin_clz(val); } static inline uint32_t ctz32(unsigned long val) { return __builtin_ctz(val); } #elif defined(_MSC_VER) && _MSC_VER >= 1400 static inline uint32_t clz32(unsigned long val) { /* __lzcnt() / _lzcnt_u32() do not work correctly on older Intel CPUs, * so use BSR instead for better compatibility. */ uint32_t zeros = 0; _BitScanReverse(&zeros, val); return 31 - zeros; } static inline uint32_t ctz32(unsigned long val) { #if defined(_M_ARM64) return _CountTrailingZeros(val); #else return _tzcnt_u32(val); #endif } #else static uint32_t popcnt(uint32_t x) { x -= ((x >> 1) & 0x55555555); x = (((x >> 2) & 0x33333333) + (x & 0x33333333)); x = (((x >> 4) + x) & 0x0f0f0f0f); x += (x >> 8); x += (x >> 16); return x & 0x0000003f; } static uint32_t clz32(uint32_t x) { x |= (x >> 1); x |= (x >> 2); x |= (x >> 4); x |= (x >> 8); x |= (x >> 16); return 32 - popcnt(x); } static uint32_t ctz32(uint32_t x) { return popcnt((x & -x) - 1); } #endif static inline uint32_t min_u32(uint32_t a, uint32_t b) { return (a < b) ? a : b; } static inline uint16_t min_u16(uint16_t a, uint16_t b) { return (a < b) ? a : b; } static inline int32_t min_i32(int32_t a, int32_t b) { return (a < b) ? a : b; } static inline uint8_t max_u8(uint8_t a, uint8_t b) { return (a > b) ? a : b; }