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Remove indeterminism from a loop. We think this will 

fix an occasional nonrepeatable bootstrap failure we've
been seeing on Darwin.

llvm-svn: 44202
This commit is contained in:
Dale Johannesen 2007-11-17 02:48:01 +00:00
parent 06a10df562
commit 7d97662467
1 changed files with 6 additions and 2 deletions
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8
llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -1028,8 +1028,12 @@ unsigned LoopStrengthReduce::CheckForIVReuse(bool HasBaseReg,
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))