Bit manipulation instructions: Difference between revisions

Revision as of 10:50, 16 August 2025

Revision as of 10:52, 16 August 2025

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* The x86 instruction core set contains:

** {{code|BSR}} Bit Scan Reverse - Returns bit index of highest set bit in input, effectively backwards count leading zeros, not defined for 0.

** {{code|BSF}} Bit Scan Forward - Returns bit index of lowest set bit in input, effectively backwards count trailing zeros, but not defined for 0.

* [[SSE4]] and the [[X86 Bit manipulation instruction set|BMI]] instruction set extensions contains instructions for:

** Count leading zeros - {{code|lzcnt}}