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fix a off-by-one bug in intersectWith(), and add a bunch of tests

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llvm-svn: 159319
This commit is contained in:
Nuno Lopes 2012-06-28 00:59:33 +00:00
parent 0a5a8934ee
commit fb9765fb80
2 changed files with 33 additions and 3 deletions
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2
lib/Support/ConstantRange.cpp
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@ -316,7 +316,7 @@ ConstantRange ConstantRange::intersectWith(const ConstantRange &CR) const {
return CR;
}
if (CR.Upper.ult(Lower)) {
if (CR.Upper.ule(Lower)) {
if (CR.Lower.ult(Lower))
return *this;

34
unittests/Support/ConstantRangeTest.cpp
View File

@ -234,9 +234,39 @@ TEST_F(ConstantRangeTest, IntersectWith) {
EXPECT_TRUE(LHS.intersectWith(RHS) == LHS);
// previous bug: intersection of [min, 3) and [2, max) should be 2
LHS = ConstantRange(APInt(32, -2147483648), APInt(32, 3));
RHS = ConstantRange(APInt(32, 2), APInt(32, 2147483648));
LHS = ConstantRange(APInt(32, -2147483646), APInt(32, 3));
RHS = ConstantRange(APInt(32, 2), APInt(32, 2147483646));
EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 2)));
// [2, 0) /\ [4, 3) = [2, 0)
LHS = ConstantRange(APInt(32, 2), APInt(32, 0));
RHS = ConstantRange(APInt(32, 4), APInt(32, 3));
EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 2), APInt(32, 0)));
// [2, 0) /\ [4, 2) = [4, 0)
LHS = ConstantRange(APInt(32, 2), APInt(32, 0));
RHS = ConstantRange(APInt(32, 4), APInt(32, 2));
EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 4), APInt(32, 0)));
// [4, 2) /\ [5, 1) = [5, 1)
LHS = ConstantRange(APInt(32, 4), APInt(32, 2));
RHS = ConstantRange(APInt(32, 5), APInt(32, 1));
EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 5), APInt(32, 1)));
// [2, 0) /\ [7, 4) = [7, 4)
LHS = ConstantRange(APInt(32, 2), APInt(32, 0));
RHS = ConstantRange(APInt(32, 7), APInt(32, 4));
EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 7), APInt(32, 4)));
// [4, 2) /\ [1, 0) = [1, 0)
LHS = ConstantRange(APInt(32, 4), APInt(32, 2));
RHS = ConstantRange(APInt(32, 1), APInt(32, 0));
EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 4), APInt(32, 2)));
// [15, 0) /\ [7, 6) = [15, 0)
LHS = ConstantRange(APInt(32, 15), APInt(32, 0));
RHS = ConstantRange(APInt(32, 7), APInt(32, 6));
EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 15), APInt(32, 0)));
}
TEST_F(ConstantRangeTest, UnionWith) {