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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 "textflag.h" // func Asin(x float64) float64 TEXT ·Asin(SB),NOSPLIT,\$0 FMOVD x+0(FP), F0 // F0=sin(x) FMOVD F0, F1 // F0=sin(x), F1=sin(x) FMULD F0, F0 // F0=sin(x)*sin(x), F1=sin(x) FLD1 // F0=1, F1=sin(x)*sin(x), F2=sin(x) FSUBRDP F0, F1 // F0=1-sin(x)*sin(x) (=cos(x)*cos(x)), F1=sin(x) FSQRT // F0=cos(x), F1=sin(x) FPATAN // F0=arcsin(sin(x))=x FMOVDP F0, ret+8(FP) RET // func Acos(x float64) float64 TEXT ·Acos(SB),NOSPLIT,\$0 FMOVD x+0(FP), F0 // F0=cos(x) FMOVD F0, F1 // F0=cos(x), F1=cos(x) FMULD F0, F0 // F0=cos(x)*cos(x), F1=cos(x) FLD1 // F0=1, F1=cos(x)*cos(x), F2=cos(x) FSUBRDP F0, F1 // F0=1-cos(x)*cos(x) (=sin(x)*sin(x)), F1=cos(x) FSQRT // F0=sin(x), F1=cos(x) FXCHD F0, F1 // F0=cos(x), F1=sin(x) FPATAN // F0=arccos(cos(x))=x FMOVDP F0, ret+8(FP) RET