[llvm-commits] [llvm] r111495 - /llvm/trunk/lib/Transforms/Scalar/LoopStrengthReduce.cpp

[Dan Gohman]

Author: djg
Date: Wed Aug 18 20:02:31 2010
New Revision: 111495

URL: http://llvm.org/viewvc/llvm-project?rev=111495&view=rev
Log:
Process the step before the start, because it's usually the simpler
of the two.

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=111495&r1=111494&r2=111495&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/LoopStrengthReduce.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/LoopStrengthReduce.cpp Wed Aug 18 20:02:31 2010
@@ -441,12 +441,12 @@
   // Distribute the sdiv over addrec operands, if the addrec doesn't overflow.
   if (const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(LHS)) {
     if (IgnoreSignificantBits || isAddRecSExtable(AR, SE)) {
-      const SCEV *Start = getExactSDiv(AR->getStart(), RHS, SE,
-                                       IgnoreSignificantBits);
-      if (!Start) return 0;
       const SCEV *Step = getExactSDiv(AR->getStepRecurrence(SE), RHS, SE,
                                       IgnoreSignificantBits);
       if (!Step) return 0;
+      const SCEV *Start = getExactSDiv(AR->getStart(), RHS, SE,
+                                       IgnoreSignificantBits);
+      if (!Start) return 0;
       return SE.getAddRecExpr(Start, Step, AR->getLoop());
     }
     return 0;