+++ /dev/null
-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build amd64,!appengine,!gccgo
-
-#include "textflag.h"
-
-// func havePOPCNT() bool
-TEXT ·havePOPCNT(SB),4,$0
- MOVQ $1, AX
- CPUID
- SHRQ $23, CX
- ANDQ $1, CX
- MOVB CX, ret+0(FP)
- RET
-
-// func popcnt(word) int
-TEXT ·popcnt(SB),NOSPLIT,$0-8
- XORQ AX, AX
- MOVQ x+0(FP), SI
- // POPCNT (SI), AX is not recognized by Go assembler,
- // so we assemble it ourselves.
- BYTE $0xf3
- BYTE $0x48
- BYTE $0x0f
- BYTE $0xb8
- BYTE $0xc6
- MOVQ AX, ret+8(FP)
- RET