Developer Guide and Reference

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_blsi_u32/64

Extracts the lowest set bit from the source operand and set the corresponding bit in the destination. The corresponding Intel® AVX2 instruction is
BLSI
.

Syntax

extern unsigned int _blsi_u32(unsigned int source);
extern unsigned __int64 _blsi_u64(unsigned __int64 source);
Arguments
source
the source from where the bits are extracted
Description
Extracts the lowest set bit from the source operand and sets the corresponding bit in the destination. All other bits in the destination are set to 0. If no bits are set in the source operand, all the bits in the destination are set to 0.
Returns
Result of the operation.