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Steve Lhomme authored
__builtin_ctz: Returns the number of trailing 0-bits in x, starting at the least significant bit position. If x is 0, the result is undefined. _BitScanForward: Search the mask data from least significant bit (LSB) to the most significant bit (MSB) for a set bit (1). If a set bit is found, the bit position of the first set bit found is returned in the first parameter. If no set bit is found, 0 is returned; otherwise, 1 is returned. __builtin_clz: Returns the number of leading 0-bits in x, starting at the most significant bit position. If x is 0, the result is undefined. _BitScanReverse: Search the mask data from most significant bit (MSB) to least significant bit (LSB) for a set bit (1). Returns Nonzero if Index was set, or 0 if no set bits were found. Index is loaded with the bit position of the first set bit (1) found.
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