[llvm-commits] [llvm] r40124 - /llvm/trunk/lib/Transforms/Scalar/InstructionCombining.cpp

[Chris Lattner]

Author: lattner
Date: Fri Jul 20 17:06:41 2007
New Revision: 40124

URL: http://llvm.org/viewvc/llvm-project?rev=40124&view=rev
Log:
this xform is already done by the constant folder.

Modified:
    llvm/trunk/lib/Transforms/Scalar/InstructionCombining.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/InstructionCombining.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/InstructionCombining.cpp?rev=40124&r1=40123&r2=40124&view=diff

==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/InstructionCombining.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/InstructionCombining.cpp Fri Jul 20 17:06:41 2007
@@ -6469,11 +6469,6 @@
 Instruction *InstCombiner::commonCastTransforms(CastInst &CI) {
   Value *Src = CI.getOperand(0);
 
-  // Casting undef to anything results in undef so might as just replace it and
-  // get rid of the cast.
-  if (isa<UndefValue>(Src))   // cast undef -> undef
-    return ReplaceInstUsesWith(CI, UndefValue::get(CI.getType()));
-
   // Many cases of "cast of a cast" are eliminable. If it's eliminable we just
   // eliminate it now.
   if (CastInst *CSrc = dyn_cast<CastInst>(Src)) {   // A->B->C cast
@@ -9888,7 +9883,7 @@
         Inst->eraseFromParent();
         continue;
       }
-      
+     
       IC.AddToWorkList(Inst);
     }