164 unsigned char _BitScanForward(unsigned long *_Index, unsigned long _Mask);
166 unsigned char _BitScanReverse(unsigned long *_Index, unsigned long _Mask);
340 unsigned char _BitScanForward64(unsigned long *_Index, unsigned __int64 _Mask);
342 unsigned char _BitScanReverse64(unsigned long *_Index, unsigned __int64 _Mask);
503 _BitScanForward(unsigned long *_Index, unsigned long _Mask) {  in _BitScanForward()  argument
506   *_Index = __builtin_ctzl(_Mask);  in _BitScanForward()
510 _BitScanReverse(unsigned long *_Index, unsigned long _Mask) {  in _BitScanReverse()  argument
513   *_Index = 31 - __builtin_clzl(_Mask);  in _BitScanReverse()
553 _BitScanForward64(unsigned long *_Index, unsigned __int64 _Mask) {  in _BitScanForward64()  argument
556   *_Index = __builtin_ctzll(_Mask);  in _BitScanForward64()
560 _BitScanReverse64(unsigned long *_Index, unsigned __int64 _Mask) {  in _BitScanReverse64()  argument
563   *_Index = 63 - __builtin_clzll(_Mask);  in _BitScanReverse64()