mirror of
https://github.com/golang/go
synced 2024-10-04 16:21:22 -06:00
718be3215f
(eliminate assumption of package global name space, make code easier to move between packages). R=r CC=golang-dev https://golang.org/cl/194072
29 lines
1.1 KiB
ArmAsm
29 lines
1.1 KiB
ArmAsm
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// func Asin(x float64) float64
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TEXT ·Asin(SB),7,$0
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FMOVD x+0(FP), F0 // F0=sin(x)
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FMOVD F0, F1 // F0=sin(x), F1=sin(x)
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FMULD F0, F0 // F0=sin(x)*sin(x), F1=sin(x)
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FLD1 // F0=1, F1=sin(x)*sin(x), F2=sin(x)
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FSUBRDP F0, F1 // F0=1-sin(x)*sin(x) (=cos(x)*cos(x)), F1=sin(x)
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FSQRT // F0=cos(x), F1=sin(x)
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FPATAN // F0=arcsin(sin(x))=x
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FMOVDP F0, r+8(FP)
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RET
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// func Acos(x float64) float64
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TEXT ·Acos(SB),7,$0
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FMOVD x+0(FP), F0 // F0=cos(x)
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FMOVD F0, F1 // F0=cos(x), F1=cos(x)
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FMULD F0, F0 // F0=cos(x)*cos(x), F1=cos(x)
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FLD1 // F0=1, F1=cos(x)*cos(x), F2=cos(x)
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FSUBRDP F0, F1 // F0=1-cos(x)*cos(x) (=sin(x)*sin(x)), F1=cos(x)
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FSQRT // F0=sin(x), F1=cos(x)
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FXCHD F0, F1 // F0=cos(x), F1=sin(x)
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FPATAN // F0=arccos(cos(x))=x
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FMOVDP F0, r+8(FP)
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RET
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