make ConstantRange::signExtend() optimal
the case [x, INT_MIN) was not handled optimally
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193694 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Support/ConstantRangeTest.cpp b/unittests/Support/ConstantRangeTest.cpp
index 4d6bbf6..3e0a085 100644
--- a/unittests/Support/ConstantRangeTest.cpp
+++ b/unittests/Support/ConstantRangeTest.cpp
@@ -216,6 +216,9 @@
EXPECT_EQ(ConstantRange(APInt(8, 120), APInt(8, 140)).signExtend(16),
ConstantRange(APInt(16, -128), APInt(16, 128)));
+
+ EXPECT_EQ(ConstantRange(APInt(16, 0x0200), APInt(16, 0x8000)).signExtend(19),
+ ConstantRange(APInt(19, 0x0200), APInt(19, 0x8000)));
}
TEST_F(ConstantRangeTest, IntersectWith) {