[llvm-commits] [llvm] r112665 - /llvm/trunk/lib/Analysis/ScalarEvolution.cpp

[Dan Gohman]

Author: djg
Date: Tue Aug 31 17:50:31 2010
New Revision: 112665

URL: http://llvm.org/viewvc/llvm-project?rev=112665&view=rev
Log:
Revert r110916. This patch is buggy because the code inside the
inner loop doesn't update all the variables in the outer loop.

Modified:
    llvm/trunk/lib/Analysis/ScalarEvolution.cpp

Modified: llvm/trunk/lib/Analysis/ScalarEvolution.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/ScalarEvolution.cpp?rev=112665&r1=112664&r2=112665&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/ScalarEvolution.cpp (original)
+++ llvm/trunk/lib/Analysis/ScalarEvolution.cpp Tue Aug 31 17:50:31 2010
@@ -1589,7 +1589,6 @@
         }
 
       // Check this multiply against other multiplies being added together.
-      bool AnyFold = false;
       for (unsigned OtherMulIdx = Idx+1;
            OtherMulIdx < Ops.size() && isa<SCEVMulExpr>(Ops[OtherMulIdx]);
            ++OtherMulIdx) {
@@ -1617,14 +1616,12 @@
             const SCEV *InnerMulSum = getAddExpr(InnerMul1,InnerMul2);
             const SCEV *OuterMul = getMulExpr(MulOpSCEV, InnerMulSum);
             if (Ops.size() == 2) return OuterMul;
-            Ops[Idx] = OuterMul;
-            Ops.erase(Ops.begin()+OtherMulIdx);
-            OtherMulIdx = Idx;
-            AnyFold = true;
+            Ops.erase(Ops.begin()+Idx);
+            Ops.erase(Ops.begin()+OtherMulIdx-1);
+            Ops.push_back(OuterMul);
+            return getAddExpr(Ops);
           }
       }
-      if (AnyFold)
-        return getAddExpr(Ops);
     }
   }