Intel® C++ Compiler Classic Developer Guide and Reference

ID 767249
Date 12/16/2022
Public

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<span class='option'>_blsmsk_u32/64 </span>

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