lzcnt

Documentation

Overview

THESE PACKAGES ARE FOR DEMONSTRATION PURPOSES ONLY!

THEY DO NOT NOT CONTAIN WORKING INTRINSICS!

See https://github.com/klauspost/intrinsics

Index

• func LzcntU32(a uint32) uint32
• func LzcntU64(a uint64) uint64

Functions

func LzcntU32

func LzcntU32(a uint32) uint32

LzcntU32: Count the number of leading zero bits in unsigned 32-bit integer 'a', and return that count in 'dst'.

tmp := 31
dst := 0
DO WHILE (tmp >= 0 AND a[tmp] = 0)
	tmp := tmp - 1
	dst := dst + 1
OD

Instruction: 'LZCNT'. Intrinsic: '_lzcnt_u32'. Requires LZCNT.

func LzcntU64

func LzcntU64(a uint64) uint64

LzcntU64: Count the number of leading zero bits in unsigned 64-bit integer 'a', and return that count in 'dst'.

tmp := 63
dst := 0
DO WHILE (tmp >= 0 AND a[tmp] = 0)
	tmp := tmp - 1
	dst := dst + 1
OD

Instruction: 'LZCNT'. Intrinsic: '_lzcnt_u64'. Requires LZCNT.