[llvm-commits] [llvm] r153035 - /llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
Duncan Sands
baldrick at free.fr
Mon Mar 19 08:35:46 PDT 2012
Author: baldrick
Date: Mon Mar 19 10:35:44 2012
New Revision: 153035
URL: http://llvm.org/viewvc/llvm-project?rev=153035&view=rev
Log:
Fix DAG combine which creates illegal vector shuffles. Patch by Heikki Kultala.
Modified:
llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
Modified: llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp?rev=153035&r1=153034&r2=153035&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Mon Mar 19 10:35:44 2012
@@ -7473,6 +7473,12 @@
// 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.
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