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[ConstantRange] Make getEquivalentICmp smarter

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This change teaches getEquivalentICmp to be smarter about generating
ICMP_NE and ICMP_EQ predicates.

llvm-svn: 283057
This commit is contained in:
Sanjoy Das 2016-10-02 00:09:49 +00:00
parent 6b37e26252
commit 2915cf67fe
2 changed files with 39 additions and 0 deletions
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8
lib/IR/ConstantRange.cpp
View File

@ -147,6 +147,14 @@ bool ConstantRange::getEquivalentICmp(CmpInst::Predicate &Pred,
Pred = isEmptySet() ? CmpInst::ICMP_ULT : CmpInst::ICMP_UGE;
RHS = APInt(getBitWidth(), 0);
Success = true;
} else if (auto *OnlyElt = getSingleElement()) {
Pred = CmpInst::ICMP_EQ;
RHS = *OnlyElt;
Success = true;
} else if (auto *OnlyMissingElt = inverse().getSingleElement()) {
Pred = CmpInst::ICMP_NE;
RHS = *OnlyMissingElt;
Success = true;
} else if (getLower().isMinSignedValue() || getLower().isMinValue()) {
Pred =
getLower().isMinSignedValue() ? CmpInst::ICMP_SLT : CmpInst::ICMP_ULT;

31
unittests/IR/ConstantRangeTest.cpp
View File

@ -760,6 +760,37 @@ TEST(ConstantRange, GetEquivalentICmp) {
EXPECT_FALSE(ConstantRange(APInt::getMinValue(32) - APInt(32, 100),
APInt::getMinValue(32) + APInt(32, 100))
.getEquivalentICmp(Pred, RHS));
EXPECT_TRUE(ConstantRange(APInt(32, 100)).getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_EQ);
EXPECT_EQ(RHS, APInt(32, 100));
EXPECT_TRUE(
ConstantRange(APInt(32, 100)).inverse().getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_NE);
EXPECT_EQ(RHS, APInt(32, 100));
// NB! It would be correct for the following four calls to getEquivalentICmp
// to return ordered predicates like CmpInst::ICMP_ULT or CmpInst::ICMP_UGT.
// However, that's not the case today.
EXPECT_TRUE(ConstantRange(APInt(32, 0)).getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_EQ);
EXPECT_EQ(RHS, APInt(32, 0));
EXPECT_TRUE(
ConstantRange(APInt(32, 0)).inverse().getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_NE);
EXPECT_EQ(RHS, APInt(32, 0));
EXPECT_TRUE(ConstantRange(APInt(32, -1)).getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_EQ);
EXPECT_EQ(RHS, APInt(32, -1));
EXPECT_TRUE(
ConstantRange(APInt(32, -1)).inverse().getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_NE);
EXPECT_EQ(RHS, APInt(32, -1));
}
} // anonymous namespace