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76285213b8
Fixes #12577. Change-Id: Id469cd92f5f9436b0ef948ee1a252ed1842bc7aa Reviewed-on: https://go-review.googlesource.com/16133 Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
67 lines
1011 B
Go
67 lines
1011 B
Go
// run
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Issue 12577: Test that there are no -0 floating-point constants.
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package main
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import "math"
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const (
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z0 = 0.0
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z1 = -0.0
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z2 = -z0
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z3 = -z2
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)
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var (
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x0 float32 = z0
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x1 float32 = z1
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x2 float32 = z2
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x3 float32 = z3
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y0 float64 = z0
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y1 float64 = z1
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y2 float64 = z2
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y3 float64 = z3
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)
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func test32(f float32) {
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if f != 0 || math.Signbit(float64(f)) {
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println("BUG: got", f, "want 0.0")
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return
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}
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}
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func test64(f float64) {
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if f != 0 || math.Signbit(f) {
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println("BUG: got", f, "want 0.0")
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return
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}
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}
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func main() {
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if f := -x0; f != 0 || !math.Signbit(float64(f)) {
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println("BUG: got", f, "want -0.0")
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}
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test32(-0.0)
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test32(x0)
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test32(x1)
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test32(x2)
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test32(x3)
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if f := -y0; f != 0 || !math.Signbit(f) {
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println("BUG: got", f, "want -0.0")
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}
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test64(-0.0)
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test64(y0)
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test64(y1)
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test64(y2)
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test64(y3)
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}
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