root/src/pkg/math/abs_amd64.s

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// Copyright 2010 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.

#include "../../cmd/ld/textflag.h"

// func Abs(x float64) float64
TEXT ·Abs(SB),NOSPLIT,$0
        MOVQ   $(1<<63), BX
        MOVQ   BX, X0 // movsd $(-0.0), x0
        MOVSD  x+0(FP), X1
        ANDNPD X1, X0
        MOVSD  X0, ret+8(FP)
        RET
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