github.com/ccccaoqing/test@v0.0.0-20220510085219-3985d23445c0/src/math/abs_amd64.s (about)

     1  // Copyright 2010 The Go Authors.  All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  #include "textflag.h"
     6  
     7  // func Abs(x float64) float64
     8  TEXT ·Abs(SB),NOSPLIT,$0
     9  	MOVQ   $(1<<63), BX
    10  	MOVQ   BX, X0 // movsd $(-0.0), x0
    11  	MOVSD  x+0(FP), X1
    12  	ANDNPD X1, X0
    13  	MOVSD  X0, ret+8(FP)
    14  	RET