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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
     3// license that can be found in the LICENSE file.
     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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