From 00294caadb5cdb4cafeb5e1c05486a395fef590c Mon Sep 17 00:00:00 2001 From: Duncan Sands Date: Mon, 19 Mar 2012 15:35:44 +0000 Subject: [PATCH] Fix DAG combine which creates illegal vector shuffles. Patch by Heikki Kultala. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153035 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 32b9fa4ec35..1bd1b95ad7d 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -7473,6 +7473,12 @@ SDValue DAGCombiner::visitBUILD_VECTOR(SDNode *N) { // Check to see if this is a BUILD_VECTOR of a bunch of EXTRACT_VECTOR_ELT // operations. If so, and if the EXTRACT_VECTOR_ELT vector inputs come from // at most two distinct vectors, turn this into a shuffle node. + + // May only combine to shuffle after legalize if shuffle is legal. + if (LegalOperations && + !TLI.isOperationLegalOrCustom(ISD::VECTOR_SHUFFLE, VT)) + return SDValue(); + SDValue VecIn1, VecIn2; for (unsigned i = 0; i != NumInScalars; ++i) { // Ignore undef inputs.