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| author | David Xu <David.Xu@arm.com> | 2014-09-11 05:10:28 +0000 |
|---|---|---|
| committer | David Xu <David.Xu@arm.com> | 2014-09-11 05:10:28 +0000 |
| commit | f7aff68fe37d176f3ea7a6074b3b43574767af68 (patch) | |
| tree | 00b930a01d42b51d8333a2ce71f0854bf29f8150 /llvm/lib/CodeGen/SelectionDAG | |
| parent | 560cbf506b3d2bd0e900bc7c37c816e9789985d8 (diff) | |
| download | bcm5719-llvm-f7aff68fe37d176f3ea7a6074b3b43574767af68.tar.gz bcm5719-llvm-f7aff68fe37d176f3ea7a6074b3b43574767af68.zip | |
Build correct vector filled with undef nodes
llvm-svn: 217570
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index b21181c3985..156d0a36930 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -2664,9 +2664,17 @@ SDValue DAGCombiner::visitAND(SDNode *N) { // fold (and x, 0) -> 0, vector edition if (ISD::isBuildVectorAllZeros(N0.getNode())) - return N0; + // do not return N0, because undef node may exist in N0 + return DAG.getConstant( + APInt::getNullValue( + N0.getValueType().getScalarType().getSizeInBits()), + N0.getValueType()); if (ISD::isBuildVectorAllZeros(N1.getNode())) - return N1; + // do not return N1, because undef node may exist in N1 + return DAG.getConstant( + APInt::getNullValue( + N1.getValueType().getScalarType().getSizeInBits()), + N1.getValueType()); // fold (and x, -1) -> x, vector edition if (ISD::isBuildVectorAllOnes(N0.getNode())) @@ -3312,9 +3320,17 @@ SDValue DAGCombiner::visitOR(SDNode *N) { // fold (or x, -1) -> -1, vector edition if (ISD::isBuildVectorAllOnes(N0.getNode())) - return N0; + // do not return N0, because undef node may exist in N0 + return DAG.getConstant( + APInt::getAllOnesValue( + N0.getValueType().getScalarType().getSizeInBits()), + N0.getValueType()); if (ISD::isBuildVectorAllOnes(N1.getNode())) - return N1; + // do not return N1, because undef node may exist in N1 + return DAG.getConstant( + APInt::getAllOnesValue( + N1.getValueType().getScalarType().getSizeInBits()), + N1.getValueType()); // fold (or (shuf A, V_0, MA), (shuf B, V_0, MB)) -> (shuf A, B, Mask1) // fold (or (shuf A, V_0, MA), (shuf B, V_0, MB)) -> (shuf B, A, Mask2) |
