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Fix PromoteIntRes_BUILD_VECTOR crash with i1 vectors

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This fixes a bug (found by llvm-stress) in
DAGTypeLegalizer::PromoteIntRes_BUILD_VECTOR where it assumed that the result
type would always be larger than the original operands. This is not always
true, however, with boolean vectors. For example, promoting a node of type v8i1
(where the operands will be of type i32, the type to which i1 is promoted) will
yield a node with a result vector element type of i16 (and operands of type
i32). As a result, we cannot blindly assume that we can ANY_EXTEND the operands
to the result type.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185794 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
2013-07-08 06:16:58 +00:00
parent 5310cdbcc9
commit 63e7a38c89
2 changed files with 46 additions and 1 deletions
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8
lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
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@@ -2930,7 +2930,13 @@ SDValue DAGTypeLegalizer::PromoteIntRes_BUILD_VECTOR(SDNode *N) {
SmallVector<SDValue, 8> Ops;
Ops.reserve(NumElems);
for (unsigned i = 0; i != NumElems; ++i) {
SDValue Op = DAG.getNode(ISD::ANY_EXTEND, dl, NOutVTElem, N->getOperand(i));
SDValue Op;
// It is possible for the operands to be larger than the result, for example,
// when the operands are promoted booleans and the result was an i1 vector.
if (N->getOperand(i).getValueType().bitsLT(NOutVTElem))
Op = DAG.getNode(ISD::ANY_EXTEND, dl, NOutVTElem, N->getOperand(i));
else
Op = N->getOperand(i);
Ops.push_back(Op);
}