go issue27718 源码
golang issue27718 代码
文件路径：/test/fixedbugs/issue27718.go
// 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.
// (-0)+0 should be 0, not -0.
package main
//go:noinline
func add64(x float64) float64 {
return x + 0
}
func testAdd64() {
var zero float64
inf := 1.0 / zero
negZero := -1 / inf
if 1/add64(negZero) != inf {
panic("negZero+0 != posZero (64 bit)")
}
}
//go:noinline
func sub64(x float64) float64 {
return x - 0
}
func testSub64() {
var zero float64
inf := 1.0 / zero
negZero := -1 / inf
if 1/sub64(negZero) != -inf {
panic("negZero-0 != negZero (64 bit)")
}
}
//go:noinline
func neg64(x float64) float64 {
return -x
}
func testNeg64() {
var zero float64
inf := 1.0 / zero
negZero := -1 / inf
if 1/neg64(negZero) != inf {
panic("-negZero != posZero (64 bit)")
}
}
//go:noinline
func add32(x float32) float32 {
return x + 0
}
func testAdd32() {
var zero float32
inf := 1.0 / zero
negZero := -1 / inf
if 1/add32(negZero) != inf {
panic("negZero+0 != posZero (32 bit)")
}
}
//go:noinline
func sub32(x float32) float32 {
return x - 0
}
func testSub32() {
var zero float32
inf := 1.0 / zero
negZero := -1 / inf
if 1/sub32(negZero) != -inf {
panic("negZero-0 != negZero (32 bit)")
}
}
//go:noinline
func neg32(x float32) float32 {
return -x
}
func testNeg32() {
var zero float32
inf := 1.0 / zero
negZero := -1 / inf
if 1/neg32(negZero) != inf {
panic("-negZero != posZero (32 bit)")
}
}
func main() {
testAdd64()
testSub64()
testNeg64()
testAdd32()
testSub32()
testNeg32()
}
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