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SUSE:SLE-12-SP1:Update
llvm.7809
backport-llvm-r205626
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File backport-llvm-r205626 of Package llvm.7809
------------------------------------------------------------------------ r205626 | tnorthover | 2014-04-04 16:49:30 +0200 (Fri, 04 Apr 2014) | 10 lines DAGLegalize: add last-ditch type-legalization for VSELECT. When LLVM sees something like (v1iN (vselect v1i1, v1iN, v1iN)) it can decide that the result is OK (v1i64 is legal on AArch64, for example) but it still need scalarising because of that v1i1. There was no code to do this though. AArch64 and ARM64 have DAG combines to produce efficient code and prevent that occuring in *most* such situations, but there are edge cases that they miss. This adds a legalization to cope with that. ------------------------------------------------------------------------ Index: lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp =================================================================== --- lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp.orig +++ lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp @@ -393,6 +393,9 @@ bool DAGTypeLegalizer::ScalarizeVectorOp case ISD::EXTRACT_VECTOR_ELT: Res = ScalarizeVecOp_EXTRACT_VECTOR_ELT(N); break; + case ISD::VSELECT: + Res = ScalarizeVecOp_VSELECT(N); + break; case ISD::STORE: Res = ScalarizeVecOp_STORE(cast<StoreSDNode>(N), OpNo); break; @@ -458,6 +461,18 @@ SDValue DAGTypeLegalizer::ScalarizeVecOp return Res; } + +/// ScalarizeVecOp_VSELECT - If the input condition is a vector that needs to be +/// scalarized, it must be <1 x i1>, so just convert to a normal ISD::SELECT +/// (still with vector output type since that was acceptable if we got here). +SDValue DAGTypeLegalizer::ScalarizeVecOp_VSELECT(SDNode *N) { + SDValue ScalarCond = GetScalarizedVector(N->getOperand(0)); + EVT VT = N->getValueType(0); + + return DAG.getNode(ISD::SELECT, SDLoc(N), VT, ScalarCond, N->getOperand(1), + N->getOperand(2)); +} + /// ScalarizeVecOp_STORE - If the value to store is a vector that needs to be /// scalarized, it must be <1 x ty>. Just store the element. SDValue DAGTypeLegalizer::ScalarizeVecOp_STORE(StoreSDNode *N, unsigned OpNo){ Index: lib/CodeGen/SelectionDAG/LegalizeTypes.h =================================================================== --- lib/CodeGen/SelectionDAG/LegalizeTypes.h.orig +++ lib/CodeGen/SelectionDAG/LegalizeTypes.h @@ -540,6 +540,7 @@ private: SDValue ScalarizeVecOp_UnaryOp(SDNode *N); SDValue ScalarizeVecOp_CONCAT_VECTORS(SDNode *N); SDValue ScalarizeVecOp_EXTRACT_VECTOR_ELT(SDNode *N); + SDValue ScalarizeVecOp_VSELECT(SDNode *N); SDValue ScalarizeVecOp_STORE(StoreSDNode *N, unsigned OpNo); //===--------------------------------------------------------------------===//
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