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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