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Fix DAG combine which creates illegal vector shuffles. Patch by Heikki Kultala.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153035 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands 2012-03-19 15:35:44 +00:00
parent 3e99b715d1
commit 00294caadb
1 changed files with 6 additions and 0 deletions
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6
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -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.