diff options
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index ba90e23b04..a27adba33b 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -3108,8 +3108,17 @@ SDOperand DAGCombiner::visitVVECTOR_SHUFFLE(SDNode *N) { // all scalar elements the same. if (isSplat) { SDNode *V = N0.Val; - if (V->getOpcode() == ISD::VBIT_CONVERT) - V = V->getOperand(0).Val; + + // If this is a vbit convert that changes the element type of the vector but + // not the number of vector elements, look through it. Be careful not to + // look though conversions that change things like v4f32 to v2f64. + if (V->getOpcode() == ISD::VBIT_CONVERT) { + SDOperand ConvInput = V->getOperand(0); + if (NumElts == + ConvInput.getConstantOperandVal(ConvInput.getNumOperands()-2)) + V = ConvInput.Val; + } + if (V->getOpcode() == ISD::VBUILD_VECTOR) { unsigned NumElems = V->getNumOperands()-2; if (NumElems > BaseIdx) { |