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Fix ConstantRange::unionWith. Also make it work a little hard in some cases to

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return the smallest union of two ranges instead of just any range that happens
to contain the union.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76360 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2009-07-19 03:44:35 +00:00
parent aafa94260d
commit 7e7dc45eb1
2 changed files with 61 additions and 45 deletions
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11
unittests/Support/ConstantRangeTest.cpp
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@ -219,6 +219,17 @@ TEST_F(ConstantRangeTest, UnionWith) {
EXPECT_TRUE(Empty.unionWith(Empty).isEmptySet());
EXPECT_TRUE(Full.unionWith(Full).isFullSet());
EXPECT_TRUE(Some.unionWith(Wrap).isFullSet());
// PR4545
EXPECT_EQ(ConstantRange(APInt(16, 14), APInt(16, 1)).unionWith(
ConstantRange(APInt(16, 0), APInt(16, 8))),
ConstantRange(APInt(16, 14), APInt(16, 8)));
EXPECT_EQ(ConstantRange(APInt(16, 6), APInt(16, 4)).unionWith(
ConstantRange(APInt(16, 4), APInt(16, 0))),
ConstantRange(16));
EXPECT_EQ(ConstantRange(APInt(16, 1), APInt(16, 0)).unionWith(
ConstantRange(APInt(16, 2), APInt(16, 1))),
ConstantRange(16));
}
TEST_F(ConstantRangeTest, SubtractAPInt) {