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[CVP][LVI] Fix incorrect scalar type when getting constant folded vec #97682

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Merged
merged 1 commit into from
Jul 4, 2024
Merged

[CVP][LVI] Fix incorrect scalar type when getting constant folded vec #97682

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5 changes: 3 additions & 2 deletions llvm/lib/Analysis/LazyValueInfo.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1370,6 +1370,7 @@ LazyValueInfoImpl::getEdgeValueLocal(Value *Val, BasicBlock *BBFrom,

// If V is the condition of the branch itself, then we know exactly what
// it is.
// NB: The condition on a `br` can't be a vector type.
if (Condition == Val)
return ValueLatticeElement::get(ConstantInt::get(
Type::getInt1Ty(Val->getContext()), isTrueDest));
Expand Down Expand Up @@ -1723,7 +1724,7 @@ Constant *LazyValueInfo::getConstant(Value *V, Instruction *CxtI) {
if (Result.isConstantRange()) {
const ConstantRange &CR = Result.getConstantRange();
if (const APInt *SingleVal = CR.getSingleElement())
return ConstantInt::get(V->getContext(), *SingleVal);
return ConstantInt::get(V->getType(), *SingleVal);
}
return nullptr;
}
Expand Down Expand Up @@ -1758,7 +1759,7 @@ Constant *LazyValueInfo::getConstantOnEdge(Value *V, BasicBlock *FromBB,
if (Result.isConstantRange()) {
const ConstantRange &CR = Result.getConstantRange();
if (const APInt *SingleVal = CR.getSingleElement())
return ConstantInt::get(V->getContext(), *SingleVal);
return ConstantInt::get(V->getType(), *SingleVal);
}
return nullptr;
}
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21 changes: 21 additions & 0 deletions llvm/test/Transforms/CorrelatedValuePropagation/vectors.ll
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Expand Up @@ -220,3 +220,24 @@ define <2 x i16> @and_with_poison(<2 x i8> %a) {
%res = and <2 x i16> %zext, <i16 u0xff, i16 poison>
ret <2 x i16> %res
}



define <4 x i64> @issue_97674_getConstantOnEdge(i1 %cond) {
entry:
br i1 %cond, label %if.then, label %if.end

if.then:
%folds = add <4 x i64> zeroinitializer, <i64 1, i64 1, i64 1, i64 1>
br label %if.end

if.end:
%r = phi <4 x i64> [ %folds, %if.then ], [ zeroinitializer, %entry ]
ret <4 x i64> %r
}

define <4 x i64> @issue_97674_getConstant() {
entry:
%folds = add <4 x i64> zeroinitializer, zeroinitializer
ret <4 x i64> %folds
}