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-rw-r--r--test/floatcmp.go93
1 files changed, 93 insertions, 0 deletions
diff --git a/test/floatcmp.go b/test/floatcmp.go
new file mode 100644
index 0000000..6c424cc
--- /dev/null
+++ b/test/floatcmp.go
@@ -0,0 +1,93 @@
+// run
+
+// Copyright 2009 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.
+
+// Test floating-point comparison involving NaN.
+
+package main
+
+import "math"
+
+type floatTest struct {
+ name string
+ expr bool
+ want bool
+}
+
+var nan float64 = math.NaN()
+var f float64 = 1
+
+var tests = []floatTest{
+ floatTest{"nan == nan", nan == nan, false},
+ floatTest{"nan != nan", nan != nan, true},
+ floatTest{"nan < nan", nan < nan, false},
+ floatTest{"nan > nan", nan > nan, false},
+ floatTest{"nan <= nan", nan <= nan, false},
+ floatTest{"nan >= nan", nan >= nan, false},
+ floatTest{"f == nan", f == nan, false},
+ floatTest{"f != nan", f != nan, true},
+ floatTest{"f < nan", f < nan, false},
+ floatTest{"f > nan", f > nan, false},
+ floatTest{"f <= nan", f <= nan, false},
+ floatTest{"f >= nan", f >= nan, false},
+ floatTest{"nan == f", nan == f, false},
+ floatTest{"nan != f", nan != f, true},
+ floatTest{"nan < f", nan < f, false},
+ floatTest{"nan > f", nan > f, false},
+ floatTest{"nan <= f", nan <= f, false},
+ floatTest{"nan >= f", nan >= f, false},
+ floatTest{"!(nan == nan)", !(nan == nan), true},
+ floatTest{"!(nan != nan)", !(nan != nan), false},
+ floatTest{"!(nan < nan)", !(nan < nan), true},
+ floatTest{"!(nan > nan)", !(nan > nan), true},
+ floatTest{"!(nan <= nan)", !(nan <= nan), true},
+ floatTest{"!(nan >= nan)", !(nan >= nan), true},
+ floatTest{"!(f == nan)", !(f == nan), true},
+ floatTest{"!(f != nan)", !(f != nan), false},
+ floatTest{"!(f < nan)", !(f < nan), true},
+ floatTest{"!(f > nan)", !(f > nan), true},
+ floatTest{"!(f <= nan)", !(f <= nan), true},
+ floatTest{"!(f >= nan)", !(f >= nan), true},
+ floatTest{"!(nan == f)", !(nan == f), true},
+ floatTest{"!(nan != f)", !(nan != f), false},
+ floatTest{"!(nan < f)", !(nan < f), true},
+ floatTest{"!(nan > f)", !(nan > f), true},
+ floatTest{"!(nan <= f)", !(nan <= f), true},
+ floatTest{"!(nan >= f)", !(nan >= f), true},
+ floatTest{"!!(nan == nan)", !!(nan == nan), false},
+ floatTest{"!!(nan != nan)", !!(nan != nan), true},
+ floatTest{"!!(nan < nan)", !!(nan < nan), false},
+ floatTest{"!!(nan > nan)", !!(nan > nan), false},
+ floatTest{"!!(nan <= nan)", !!(nan <= nan), false},
+ floatTest{"!!(nan >= nan)", !!(nan >= nan), false},
+ floatTest{"!!(f == nan)", !!(f == nan), false},
+ floatTest{"!!(f != nan)", !!(f != nan), true},
+ floatTest{"!!(f < nan)", !!(f < nan), false},
+ floatTest{"!!(f > nan)", !!(f > nan), false},
+ floatTest{"!!(f <= nan)", !!(f <= nan), false},
+ floatTest{"!!(f >= nan)", !!(f >= nan), false},
+ floatTest{"!!(nan == f)", !!(nan == f), false},
+ floatTest{"!!(nan != f)", !!(nan != f), true},
+ floatTest{"!!(nan < f)", !!(nan < f), false},
+ floatTest{"!!(nan > f)", !!(nan > f), false},
+ floatTest{"!!(nan <= f)", !!(nan <= f), false},
+ floatTest{"!!(nan >= f)", !!(nan >= f), false},
+}
+
+func main() {
+ bad := false
+ for _, t := range tests {
+ if t.expr != t.want {
+ if !bad {
+ bad = true
+ println("BUG: floatcmp")
+ }
+ println(t.name, "=", t.expr, "want", t.want)
+ }
+ }
+ if bad {
+ panic("floatcmp failed")
+ }
+}