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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2018-01-03 22:42:33 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2018-01-03 22:42:33 +0000 |
| commit | ec0a2fb7037aab3eca8eacdfe85692d3c140a40f (patch) | |
| tree | 7d0831d213cec6f601a80cc89a52000ffb3078ee /llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | |
| parent | 31abb45803d272b3fd211253f571047256ab2f19 (diff) | |
| download | bcm5719-llvm-ec0a2fb7037aab3eca8eacdfe85692d3c140a40f.tar.gz bcm5719-llvm-ec0a2fb7037aab3eca8eacdfe85692d3c140a40f.zip | |
[DAGCombine] Handle out of range EXTRACT_VECTOR_ELT indices
Handle this in DAGCombiner::visitEXTRACT_VECTOR_ELT the same as we already do in SelectionDAG::getNode and use APInt instead of getZExtValue.
This should also fix oss-fuzz #4910
llvm-svn: 321767
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 81bff4d7eef..2b44e4fa93c 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -14200,6 +14200,10 @@ SDValue DAGCombiner::visitEXTRACT_VECTOR_ELT(SDNode *N) { SDValue EltNo = N->getOperand(1); ConstantSDNode *ConstEltNo = dyn_cast<ConstantSDNode>(EltNo); + // extract_vector_elt of out-of-bounds element -> UNDEF + if (ConstEltNo && ConstEltNo->getAPIntValue().uge(VT.getVectorNumElements())) + return DAG.getUNDEF(NVT); + // extract_vector_elt (build_vector x, y), 1 -> y if (ConstEltNo && InVec.getOpcode() == ISD::BUILD_VECTOR && |
