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# Text file src/math/asin_386.s

## Documentation: math

```     1// Copyright 2010 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
4
5#include "textflag.h"
6
7// func Asin(x float64) float64
8TEXT ·Asin(SB),NOSPLIT,\$0
9	FMOVD   x+0(FP), F0  // F0=sin(x)
10	FMOVD   F0, F1       // F0=sin(x), F1=sin(x)
11	FMULD   F0, F0       // F0=sin(x)*sin(x), F1=sin(x)
12	FLD1                 // F0=1, F1=sin(x)*sin(x), F2=sin(x)
13	FSUBRDP F0, F1       // F0=1-sin(x)*sin(x) (=cos(x)*cos(x)), F1=sin(x)
14	FSQRT                // F0=cos(x), F1=sin(x)
15	FPATAN               // F0=arcsin(sin(x))=x
16	FMOVDP  F0, ret+8(FP)
17	RET
18
19// func Acos(x float64) float64
20TEXT ·Acos(SB),NOSPLIT,\$0
21	FMOVD   x+0(FP), F0  // F0=cos(x)
22	FMOVD   F0, F1       // F0=cos(x), F1=cos(x)
23	FMULD   F0, F0       // F0=cos(x)*cos(x), F1=cos(x)
24	FLD1                 // F0=1, F1=cos(x)*cos(x), F2=cos(x)
25	FSUBRDP F0, F1       // F0=1-cos(x)*cos(x) (=sin(x)*sin(x)), F1=cos(x)
26	FSQRT                // F0=sin(x), F1=cos(x)
27	FXCHD   F0, F1       // F0=cos(x), F1=sin(x)
28	FPATAN               // F0=arccos(cos(x))=x
29	FMOVDP	F0, ret+8(FP)
30	RET
```

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