make ConstantRange::zeroExtend() optimal
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160643 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Support/ConstantRangeTest.cpp b/unittests/Support/ConstantRangeTest.cpp
index 7d4055f..263f93c 100644
--- a/unittests/Support/ConstantRangeTest.cpp
+++ b/unittests/Support/ConstantRangeTest.cpp
@@ -193,6 +193,10 @@
EXPECT_EQ(ZSome, ConstantRange(Some.getLower().zext(20),
Some.getUpper().zext(20)));
EXPECT_EQ(ZWrap, ConstantRange(APInt(20, 0), APInt(20, 0x10000)));
+
+ // zext([5, 0), 3->7) = [5, 8)
+ ConstantRange FiveZero(APInt(3, 5), APInt(3, 0));
+ EXPECT_EQ(FiveZero.zeroExtend(7), ConstantRange(APInt(7, 5), APInt(7, 8)));
}
TEST_F(ConstantRangeTest, SExt) {