From: Than McIntosh <thanm@google.com>
Date: Wed, 9 Aug 2017 13:16:38 +0000 (-0400)
Subject: math: additional tests for Ldexp
X-Git-Tag: go1.10beta1~1684
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=ff560ee9507cb6b3da1405faf41d6ade637118b7;p=gostls13.git

math: additional tests for Ldexp

Add test cases to verify behavior for Ldexp with exponents outside the
range of Minint32/Maxint32, for a gccgo bug.

Test for issue #21323.

Change-Id: Iea67bc6fcfafdfddf515cf7075bdac59360c277a
Reviewed-on: https://go-review.googlesource.com/54230
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
---

diff --git a/src/math/all_test.go b/src/math/all_test.go
index 39a3a4986b..4449228c1e 100644
--- a/src/math/all_test.go
+++ b/src/math/all_test.go
@@ -8,6 +8,7 @@ import (
 	"fmt"
 	. "math"
 	"testing"
+	"unsafe"
 )
 
 var vf = []float64{
@@ -1368,6 +1369,8 @@ var vfldexpSC = []fi{
 	{Inf(-1), 0},
 	{Inf(-1), -1024},
 	{NaN(), -1024},
+	{10, int(1) << (uint64(unsafe.Sizeof(0)-1) * 8)},
+	{10, -(int(1) << (uint64(unsafe.Sizeof(0)-1) * 8))},
 }
 var ldexpSC = []float64{
 	0,
@@ -1381,6 +1384,8 @@ var ldexpSC = []float64{
 	Inf(-1),
 	Inf(-1),
 	NaN(),
+	Inf(1),
+	0,
 }
 
 var vflgammaSC = []float64{