diff options
Diffstat (limited to 'src/math/asin_386.s')
| -rw-r--r-- | src/math/asin_386.s | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/math/asin_386.s b/src/math/asin_386.s new file mode 100644 index 000000000..4f34e123e --- /dev/null +++ b/src/math/asin_386.s @@ -0,0 +1,30 @@ +// 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 |