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test: add test for rounding to positive zero

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Per the language spec clarification in https://golang.org/cl/14727.

Updates #12576
Updates #12621

Change-Id: I1e459c3c11a571bd29582761faacaa9ca3178ba6
Reviewed-on: https://go-review.googlesource.com/91895
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Ian Lance Taylor 2018-02-04 19:15:18 -08:00 committed by Brad Fitzpatrick
parent 9916feeddf
commit d9fc1929e9
1 changed files with 20 additions and 0 deletions
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20
test/fixedbugs/issue12621.go Normal file
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@ -0,0 +1,20 @@
// run
// Copyright 2018 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.
// Issues 12576 and 12621: Negative untyped floating point constants
// with small magnitude round to 0, not negative zero.
package main
import "math"
var m = -1e-10000
func main() {
if math.Signbit(m) {
panic(m)
}
}