summaryrefslogtreecommitdiff
path: root/src/pkg/math/asin_386.s
diff options
context:
space:
mode:
authorOndřej Surý <ondrej@sury.org>2011-09-13 13:13:40 +0200
committerOndřej Surý <ondrej@sury.org>2011-09-13 13:13:40 +0200
commit5ff4c17907d5b19510a62e08fd8d3b11e62b431d (patch)
treec0650497e988f47be9c6f2324fa692a52dea82e1 /src/pkg/math/asin_386.s
parent80f18fc933cf3f3e829c5455a1023d69f7b86e52 (diff)
downloadgolang-upstream/60.tar.gz
Imported Upstream version 60upstream/60
Diffstat (limited to 'src/pkg/math/asin_386.s')
-rw-r--r--src/pkg/math/asin_386.s28
1 files changed, 28 insertions, 0 deletions
diff --git a/src/pkg/math/asin_386.s b/src/pkg/math/asin_386.s
new file mode 100644
index 000000000..93df552dc
--- /dev/null
+++ b/src/pkg/math/asin_386.s
@@ -0,0 +1,28 @@
+// 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.
+
+// func Asin(x float64) float64
+TEXT ·Asin(SB),7,$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, r+8(FP)
+ RET
+
+// func Acos(x float64) float64
+TEXT ·Acos(SB),7,$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, r+8(FP)
+ RET