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[IR] fix Constant::isElementWiseEqual() to allow for all undef elements compare

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We could argue that match() should be more flexible here,
but I'm not sure what impact that would have on existing code.
This commit is contained in:
Sanjay Patel 2020-01-17 08:31:16 -05:00
parent ffd3e1607d
commit c1e159ef6e
2 changed files with 3 additions and 2 deletions
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3
llvm/lib/IR/Constants.cpp
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@ -296,7 +296,8 @@ bool Constant::isElementWiseEqual(Value *Y) const {
Type *IntTy = VectorType::getInteger(cast<VectorType>(Ty));
Constant *C0 = ConstantExpr::getBitCast(const_cast<Constant *>(this), IntTy);
Constant *C1 = ConstantExpr::getBitCast(cast<Constant>(Y), IntTy);
return match(ConstantExpr::getICmp(ICmpInst::ICMP_EQ, C0, C1), m_One());
Constant *CmpEq = ConstantExpr::getICmp(ICmpInst::ICMP_EQ, C0, C1);
return isa<UndefValue>(CmpEq) || match(CmpEq, m_One());
}
bool Constant::containsUndefElement() const {

2
llvm/unittests/IR/ConstantsTest.cpp
View File

@ -620,7 +620,7 @@ TEST(ConstantsTest, isElementWiseEqual) {
EXPECT_TRUE(CF1211->isElementWiseEqual(CF12U1));
EXPECT_TRUE(CF12U1->isElementWiseEqual(CF1211));
EXPECT_FALSE(CFUU1U->isElementWiseEqual(CF12U1)); // FIXME - all lanes compare as undef
EXPECT_TRUE(CFUU1U->isElementWiseEqual(CF12U1));
EXPECT_FALSE(CF12U2->isElementWiseEqual(CF12U1));
EXPECT_FALSE(CF12U1->isElementWiseEqual(CF12U2));