Function bitCount

physx/source/foundation/include/PsBitUtils.h:42–48

namespace shdfnd
{
PX_INLINE uint32_t bitCount(uint32_t v)
{
	// from http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel
	uint32_t const w = v - ((v >> 1) & 0x55555555);
	uint32_t const x = (w & 0x33333333) + ((w >> 2) & 0x33333333);
	return (((x + (x >> 4)) & 0xF0F0F0F) * 0x1010101) >> 24;
}

PX_INLINE bool isPowerOfTwo(uint32_t x)
{