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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) {
506   *_Index = __builtin_ctzl(_Mask);
510 _BitScanReverse(unsigned long *_Index, unsigned long _Mask) {
513   *_Index = 31 - __builtin_clzl(_Mask);
553 _BitScanForward64(unsigned long *_Index, unsigned __int64 _Mask) {
556   *_Index = __builtin_ctzll(_Mask);
560 _BitScanReverse64(unsigned long *_Index, unsigned __int64 _Mask) {
563   *_Index = 63 - __builtin_clzll(_Mask);