Optimized VmaCountBitsSets to use std::popcount when C++20 is enabled
Closes
@@ -2574,6 +2574,9 @@ VMA_CALL_PRE void VMA_CALL_POST vmaFreeStatsString(
#ifdef _MSC_VER
#include <intrin.h> // For functions like __popcnt, _BitScanForward etc.
#endif
+#if __cplusplus >= 202002L || _MSVC_LANG >= 202002L // C++20
+ #include <bit> // For std::popcount
+#endif
/*******************************************************************************
CONFIGURATION SECTION
@@ -3176,12 +3179,16 @@ But you need to check in runtime whether user's CPU supports these, as some old
*/
static inline uint32_t VmaCountBitsSet(uint32_t v)
{
+#if __cplusplus >= 202002L || _MSVC_LANG >= 202002L // C++20
+ return std::popcount(v);
+#else
uint32_t c = v - ((v >> 1) & 0x55555555);
c = ((c >> 2) & 0x33333333) + (c & 0x33333333);
c = ((c >> 4) + c) & 0x0F0F0F0F;
c = ((c >> 8) + c) & 0x00FF00FF;
c = ((c >> 16) + c) & 0x0000FFFF;
return c;
+#endif
}
static inline uint8_t VmaBitScanLSB(uint64_t mask)
