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-rw-r--r--test/fixedbugs/issue14553.go45
1 files changed, 45 insertions, 0 deletions
diff --git a/test/fixedbugs/issue14553.go b/test/fixedbugs/issue14553.go
new file mode 100644
index 0000000..d7ebb12
--- /dev/null
+++ b/test/fixedbugs/issue14553.go
@@ -0,0 +1,45 @@
+// run
+
+// Copyright 2016 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.
+
+// This test checks if the compiler's internal constant
+// arithmetic correctly rounds denormal float32 values.
+
+package main
+
+import (
+ "fmt"
+ "math"
+)
+
+func main() {
+ for _, t := range []struct {
+ value float32
+ bits uint32
+ }{
+ {0e+00, 0x00000000},
+ {1e-46, 0x00000000},
+ {0.5e-45, 0x00000000},
+ {0.8e-45, 0x00000001},
+ {1e-45, 0x00000001},
+ {2e-45, 0x00000001},
+ {3e-45, 0x00000002},
+ {4e-45, 0x00000003},
+ {5e-45, 0x00000004},
+ {6e-45, 0x00000004},
+ {7e-45, 0x00000005},
+ {8e-45, 0x00000006},
+ {9e-45, 0x00000006},
+ {1.0e-44, 0x00000007},
+ {1.1e-44, 0x00000008},
+ {1.2e-44, 0x00000009},
+ } {
+ got := math.Float32bits(t.value)
+ want := t.bits
+ if got != want {
+ panic(fmt.Sprintf("bits(%g) = 0x%08x; want 0x%08x", t.value, got, want))
+ }
+ }
+}