File: ctz_amd64.s

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golang-github-dgryski-go-bits 0.0~git20151205.0.86c69b3-1
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// +build amd64,!appengine

// func Ctz(x uint64) uint64
TEXT ·Ctz(SB),4,$0-16
        BSFQ  x+0(FP), AX
        JZ zero
        MOVQ AX, ret+8(FP)
        RET
zero:
        MOVQ $64, ret+8(FP)
        RET