[llvm-commits] [llvm] r44202 - /llvm/trunk/lib/Transforms/Scalar/LoopStrengthReduce.cpp

[Dale Johannesen]

Author: johannes
Date: Fri Nov 16 20:48:01 2007
New Revision: 44202

URL: http://llvm.org/viewvc/llvm-project?rev=44202&view=rev
Log:
Remove indeterminism from a loop.  We think this will
fix an occasional nonrepeatable bootstrap failure we've
been seeing on Darwin.


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=44202&r1=44201&r2=44202&view=diff

==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/LoopStrengthReduce.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/LoopStrengthReduce.cpp Fri Nov 16 20:48:01 
2007
@@ -1028,8 +1028,12 @@
                                 const std::vector<BasedUser>& UsersToProcess) {
   if (SCEVConstant *SC = dyn_cast<SCEVConstant>(Stride)) {
     int64_t SInt = SC->getValue()->getSExtValue();
-    for (std::map<SCEVHandle, IVsOfOneStride>::iterator SI= 
IVsByStride.begin(),
-           SE = IVsByStride.end(); SI != SE; ++SI) {
+    for (unsigned NewStride = 0, e = StrideOrder.size(); NewStride != e;
+         ++NewStride) {
+      std::map<SCEVHandle, IVsOfOneStride>::iterator SI = 
+                IVsByStride.find(StrideOrder[NewStride]);
+      if (SI == IVsByStride.end()) 
+        continue;
       int64_t SSInt = 
cast<SCEVConstant>(SI->first)->getValue()->getSExtValue();
       if (SI->first != Stride &&
           (unsigned(abs(SInt)) < SSInt || (SInt % SSInt) != 0))


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