From b0f076910b3b2f9cad9c366e7aafb9d92414869e Mon Sep 17 00:00:00 2001 From: Jiangning Liu Date: Wed, 1 Apr 2015 01:52:38 +0000 Subject: Fix PR23065. Avoid optimizing bitcast of build_vector with constant input to scalar_to_vector. llvm-svn: 233778 --- llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 5 ----- 1 file changed, 5 deletions(-) (limited to 'llvm/lib/CodeGen/SelectionDAG') diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 0ac4b77fed5..19950f5dad1 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -7024,7 +7024,6 @@ ConstantFoldBITCASTofBUILD_VECTOR(SDNode *BV, EVT DstEltVT) { // Finally, this must be the case where we are shrinking elements: each input // turns into multiple outputs. - bool isS2V = ISD::isScalarToVector(BV); unsigned NumOutputsPerInput = SrcBitSize/DstBitSize; EVT VT = EVT::getVectorVT(*DAG.getContext(), DstEltVT, NumOutputsPerInput*BV->getNumOperands()); @@ -7042,10 +7041,6 @@ ConstantFoldBITCASTofBUILD_VECTOR(SDNode *BV, EVT DstEltVT) { for (unsigned j = 0; j != NumOutputsPerInput; ++j) { APInt ThisVal = OpVal.trunc(DstBitSize); Ops.push_back(DAG.getConstant(ThisVal, DstEltVT)); - if (isS2V && i == 0 && j == 0 && ThisVal.zext(SrcBitSize) == OpVal) - // Simply turn this into a SCALAR_TO_VECTOR of the new type. - return DAG.getNode(ISD::SCALAR_TO_VECTOR, SDLoc(BV), VT, - Ops[0]); OpVal = OpVal.lshr(DstBitSize); } -- cgit v1.2.3