[llvm-commits] [llvm] r153463 - /llvm/trunk/lib/Transforms/Scalar/LoopStrengthReduce.cpp

[Andrew Trick]

Author: atrick
Date: Mon Mar 26 15:28:37 2012
New Revision: 153463

URL: http://llvm.org/viewvc/llvm-project?rev=153463&view=rev
Log:
LSR ivchain bug fix: corner case with ConstantExpr.

Fixes PR11950.

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

Modified: llvm/trunk/lib/Transforms/Scalar/LoopStrengthReduce.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/LoopStrengthReduce.cpp?rev=153463&r1=153462&r2=153463&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/LoopStrengthReduce.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/LoopStrengthReduce.cpp Mon Mar 26 15:28:37 2012
@@ -704,8 +704,9 @@
         Value *UVal = U->getValue();
         for (Value::use_iterator UI = UVal->use_begin(), UE = UVal->use_end();
              UI != UE; ++UI) {
-          Instruction *User = cast<Instruction>(*UI);
-          if (User->getOpcode() == Instruction::Mul
+          // If U is a constant, it may be used by a ConstantExpr.
+          Instruction *User = dyn_cast<Instruction>(*UI);
+          if (User && User->getOpcode() == Instruction::Mul
               && SE.isSCEVable(User->getType())) {
             return SE.getSCEV(User) == Mul;
           }