diff options
| author | Chris Lattner <sabre@nondot.org> | 2006-03-28 19:11:05 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-03-28 19:11:05 +0000 |
| commit | 4fbdd59f4ff40122ddf5a7adb40e1344da4f5f2b (patch) | |
| tree | 7132e5e1478c17d1f33ae5daf34965693a55b9b5 /lib/CodeGen/SelectionDAG/DAGCombiner.cpp | |
| parent | f35b29765b2c1393aa479cd2d9c82d99c18d7430 (diff) | |
Don't crash on X^X if X is a vector. Instead, produce a vector of zeros.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27229 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 157b0a26b4..424942b3e9 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -1396,8 +1396,16 @@ SDOperand DAGCombiner::visitXOR(SDNode *N) { DAG.getConstant(N1C->getValue()^N01C->getValue(), VT)); } // fold (xor x, x) -> 0 - if (N0 == N1) - return DAG.getConstant(0, VT); + if (N0 == N1) { + if (!MVT::isVector(VT)) { + return DAG.getConstant(0, VT); + } else if (!AfterLegalize || TLI.isOperationLegal(ISD::BUILD_VECTOR, VT)) { + // Produce a vector of zeros. + SDOperand El = DAG.getConstant(0, MVT::getVectorBaseType(VT)); + std::vector<SDOperand> Ops(MVT::getVectorNumElements(VT), El); + return DAG.getNode(ISD::BUILD_VECTOR, VT, Ops); + } + } // fold (xor (zext x), (zext y)) -> (zext (xor x, y)) if (N0.getOpcode() == ISD::ZERO_EXTEND && N1.getOpcode() == ISD::ZERO_EXTEND && |