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| author | Duncan Sands <baldrick@free.fr> | 2012-03-19 15:35:44 +0000 |
|---|---|---|
| committer | Duncan Sands <baldrick@free.fr> | 2012-03-19 15:35:44 +0000 |
| commit | 00294caadb5cdb4cafeb5e1c05486a395fef590c (patch) | |
| tree | b9e12b031be4f6978cf92ed790023c0f8201366b /lib | |
| parent | 3e99b715d1f9fd3db9ee3847d845e2804bd82280 (diff) | |
| download | llvm-00294caadb5cdb4cafeb5e1c05486a395fef590c.tar.gz llvm-00294caadb5cdb4cafeb5e1c05486a395fef590c.tar.bz2 llvm-00294caadb5cdb4cafeb5e1c05486a395fef590c.tar.xz | |
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
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 32b9fa4ec3..1bd1b95ad7 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. |