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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
     8	TEXT ·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
    20	TEXT ·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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