Developer Guide and Reference

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_blsmsk_u32/64

Sets all the lower bits of the destination to “1” up to and including lowest set bit (=1) in the source operand. The corresponding Intel® AVX2 instruction is
BLSMSK
.

Syntax

extern unsigned int _blsmsk_u32(unsigned int s1);
extern unsigned __int64 _blsmsk_u64(unsigned __int64 s1);
Arguments
s1
the source operand used for the operation
Description
Sets all the lower bits of the destination to “1” up to and including lowest set bit (=1) in the source operand. If source operand is 0, all bits of the destination are set to 1.
Returns
Result of the operation