mirror of
https://github.com/golang/go
synced 2024-11-23 10:00:03 -07:00
e1e4c499f0
This CL add test cases for the unary FP negative operation. Change-Id: I54e7292ca9df05da0c2b113adefc97ee1e94c6e2 Reviewed-on: https://go-review.googlesource.com/c/go/+/190937 Run-TryBot: Ben Shi <powerman1st@163.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
103 lines
1.6 KiB
Go
103 lines
1.6 KiB
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()
|
|
}
|