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Added usage of std::countr_zero, std::countl_zero from C++20 when available

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This commit is contained in:
Adam Sawicki 2024-01-20 23:49:24 +01:00
parent 037a9386cb
commit 498486b1e5
1 changed files with 15 additions and 1 deletions
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16
include/vk_mem_alloc.h
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@ -2700,7 +2700,7 @@ VMA_CALL_PRE void VMA_CALL_POST vmaFreeStatsString(
#include <intrin.h> // For functions like __popcnt, _BitScanForward etc.
#endif
#if VMA_CPP20
#include <bit> // For std::popcount
#include <bit>
#endif
#if VMA_STATS_STRING_ENABLED
@ -3352,6 +3352,10 @@ static inline uint8_t VmaBitScanLSB(uint64_t mask)
if (_BitScanForward64(&pos, mask))
return static_cast<uint8_t>(pos);
return UINT8_MAX;
#elif VMA_CPP20
if(mask)
return static_cast<uint8_t>(std::countr_zero(mask));
return UINT8_MAX;
#elif defined __GNUC__ || defined __clang__
return static_cast<uint8_t>(__builtin_ffsll(mask)) - 1U;
#else
@ -3374,6 +3378,10 @@ static inline uint8_t VmaBitScanLSB(uint32_t mask)
if (_BitScanForward(&pos, mask))
return static_cast<uint8_t>(pos);
return UINT8_MAX;
#elif VMA_CPP20
if(mask)
return static_cast<uint8_t>(std::countr_zero(mask));
return UINT8_MAX;
#elif defined __GNUC__ || defined __clang__
return static_cast<uint8_t>(__builtin_ffs(mask)) - 1U;
#else
@ -3395,6 +3403,9 @@ static inline uint8_t VmaBitScanMSB(uint64_t mask)
unsigned long pos;
if (_BitScanReverse64(&pos, mask))
return static_cast<uint8_t>(pos);
#elif VMA_CPP20
if(mask)
return 63 - static_cast<uint8_t>(std::countl_zero(mask));
#elif defined __GNUC__ || defined __clang__
if (mask)
return 63 - static_cast<uint8_t>(__builtin_clzll(mask));
@ -3417,6 +3428,9 @@ static inline uint8_t VmaBitScanMSB(uint32_t mask)
unsigned long pos;
if (_BitScanReverse(&pos, mask))
return static_cast<uint8_t>(pos);
#elif VMA_CPP20
if(mask)
return 31 - static_cast<uint8_t>(std::countl_zero(mask));
#elif defined __GNUC__ || defined __clang__
if (mask)
return 31 - static_cast<uint8_t>(__builtin_clz(mask));