Developer Guide and Reference

Contents

_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.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804