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fix corner case in ConstantRange::intersectWith(). 

this fixes the missed optimization I was seeing in the CorrelatedValuePropagation pass

llvm-svn: 157032
This commit is contained in:
Nuno Lopes 2012-05-18 00:14:36 +00:00
parent badd100c26
commit 63afc08ca7
2 changed files with 6 additions and 1 deletions
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2
llvm/lib/Support/ConstantRange.cpp
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@ -288,7 +288,7 @@ ConstantRange ConstantRange::intersectWith(const ConstantRange &CR) const {
if (CR.Upper.ult(Upper))
return CR;
if (CR.Upper.ult(Lower))
if (CR.Upper.ule(Lower))
return ConstantRange(CR.Lower, Upper);
if (getSetSize().ult(CR.getSetSize()))

5
llvm/unittests/Support/ConstantRangeTest.cpp
View File

@ -232,6 +232,11 @@ TEST_F(ConstantRangeTest, IntersectWith) {
ConstantRange LHS(APInt(16, 4), APInt(16, 2));
ConstantRange RHS(APInt(16, 6), APInt(16, 5));
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));
EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 2)));
}
TEST_F(ConstantRangeTest, UnionWith) {