From: Ben Shi <powerman1st@163.com>
Date: Tue, 20 Aug 2019 02:29:26 +0000 (+0000)
Subject: test/fixedbugs: add more test cases to issue #27718
X-Git-Tag: go1.14beta1~1329
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=e1e4c499f0849af4fca353163e4ffabbda6f9089;p=gostls13.git

test/fixedbugs: add more test cases to issue #27718

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>
---

diff --git a/test/fixedbugs/issue27718.go b/test/fixedbugs/issue27718.go
index f7794182f5..ff616fb0f2 100644
--- a/test/fixedbugs/issue27718.go
+++ b/test/fixedbugs/issue27718.go
@@ -36,6 +36,20 @@ func testSub64() {
 	}
 }
 
+//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
@@ -64,9 +78,25 @@ func testSub32() {
 	}
 }
 
+//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()
 }