/usr/share/gocode/src/github.com/dgryski/go-bits/popcnt_amd64.s is in golang-github-dgryski-go-bits-dev 0.0~git20151205.0.86c69b3-4.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 | // +build amd64,!appengine,!popcntgo
#define POPCNTQ_DX_DX BYTE $0xf3; BYTE $0x48; BYTE $0x0f; BYTE $0xb8; BYTE $0xd2
// func Popcnt(x uint64) uint64
TEXT ·Popcnt(SB),4,$0-16
MOVQ x+0(FP), DX
POPCNTQ_DX_DX
MOVQ DX, ret+8(FP)
RET
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