math: improved accuracy for Tan
R=rsc
CC=golang-dev
https://golang.org/cl/5298087
diff --git a/src/pkg/math/all_test.go b/src/pkg/math/all_test.go
index b540b17..c650a16 100644
--- a/src/pkg/math/all_test.go
+++ b/src/pkg/math/all_test.go
@@ -7,7 +7,6 @@
import (
"fmt"
. "math"
- "runtime"
"testing"
)
@@ -2247,7 +2246,7 @@
func TestTan(t *testing.T) {
for i := 0; i < len(vf); i++ {
- if f := Tan(vf[i]); !close(tan[i], f) {
+ if f := Tan(vf[i]); !veryclose(tan[i], f) {
t.Errorf("Tan(%g) = %g, want %g", vf[i], f, tan[i])
}
}
@@ -2257,16 +2256,6 @@
t.Errorf("Tan(%g) = %g, want %g", vfsinSC[i], f, sinSC[i])
}
}
-
- // Make sure portable Tan(Pi/2) doesn't panic (it used to).
- // The portable implementation returns NaN.
- // Assembly implementations might not,
- // because Pi/2 is not exactly representable.
- if runtime.GOARCH != "386" {
- if f := Tan(Pi / 2); !alike(f, NaN()) {
- t.Errorf("Tan(%g) = %g, want %g", Pi/2, f, NaN())
- }
- }
}
func TestTanh(t *testing.T) {
