/usr/share/gocode/src/github.com/dgryski/go-bits/clz_amd64.s is in golang-github-dgryski-go-bits-dev 0.0~git20151205.0.86c69b3-4.
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1 2 3 4 5 6 7 8 9 10 11 12 13 | // +build amd64,!appengine
// func Clz(x uint64) uint64
TEXT ·Clz(SB),4,$0-16
BSRQ x+0(FP), AX
JZ zero
SUBQ $63, AX
NEGQ AX
MOVQ AX, ret+8(FP)
RET
zero:
MOVQ $64, ret+8(FP)
RET
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