math, runtime: use a NaN that matches gcc's
our old choice is not working properly at least on VFPv2 in
ARM1136JF-S (it's not preserved across float64->float32 conversions).
Fixes #3745.
R=dave, rsc
CC=golang-dev
https://golang.org/cl/6344078
diff --git a/src/pkg/math/all_test.go b/src/pkg/math/all_test.go
index 8cbead1..cdea803 100644
--- a/src/pkg/math/all_test.go
+++ b/src/pkg/math/all_test.go
@@ -1693,6 +1693,17 @@
return false
}
+func TestNaN(t *testing.T) {
+ f64 := NaN()
+ if f64 == f64 {
+ t.Fatalf("NaN() returns %g, expected NaN", f64)
+ }
+ f32 := float32(f64)
+ if f32 == f32 {
+ t.Fatalf("float32(NaN()) is %g, expected NaN", f32)
+ }
+}
+
func TestAcos(t *testing.T) {
for i := 0; i < len(vf); i++ {
a := vf[i] / 10
