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Source file test/fixedbugs/issue12577.go

Documentation: test/fixedbugs

  // run
  
  // Copyright 2015 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.
  
  // Issue 12577: Test that there are no -0 floating-point constants.
  
  package main
  
  import "math"
  
  const (
  	z0 = 0.0
  	z1 = -0.0
  	z2 = -z0
  	z3 = -z2
  )
  
  var (
  	x0 float32 = z0
  	x1 float32 = z1
  	x2 float32 = z2
  	x3 float32 = z3
  
  	y0 float64 = z0
  	y1 float64 = z1
  	y2 float64 = z2
  	y3 float64 = z3
  )
  
  func test32(f float32) {
  	if f != 0 || math.Signbit(float64(f)) {
  		println("BUG: got", f, "want 0.0")
  		return
  	}
  }
  
  func test64(f float64) {
  	if f != 0 || math.Signbit(f) {
  		println("BUG: got", f, "want 0.0")
  		return
  	}
  }
  
  func main() {
  	if f := -x0; f != 0 || !math.Signbit(float64(f)) {
  		println("BUG: got", f, "want -0.0")
  	}
  
  	test32(-0.0)
  	test32(x0)
  	test32(x1)
  	test32(x2)
  	test32(x3)
  
  	if f := -y0; f != 0 || !math.Signbit(f) {
  		println("BUG: got", f, "want -0.0")
  	}
  
  	test64(-0.0)
  	test64(y0)
  	test64(y1)
  	test64(y2)
  	test64(y3)
  }
  

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