[llvm-commits] [llvm] r71240 - /llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp

[Anton Korobeynikov]

Author: asl
Date: Fri May  8 13:51:34 2009
New Revision: 71240

URL: http://llvm.org/viewvc/llvm-project?rev=71240&view=rev
Log:
Do not emit bit tests if target does not support natively left shift

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp?rev=71240&r1=71239&r2=71240&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp Fri May  8 13:51:34 2009
@@ -1923,6 +1923,10 @@
   // inserting any additional MBBs necessary to represent the switch.
   MachineFunction *CurMF = CurMBB->getParent();
 
+  // If target does not have legal shift left, do not emit bit tests at all.
+  if (!TLI.isOperationLegal(ISD::SHL, TLI.getPointerTy()))
+    return false;
+
   size_t numCmps = 0;
   for (CaseItr I = CR.Range.first, E = CR.Range.second;
        I!=E; ++I) {