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Remove indeterminism from a loop. We think this will

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



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44202 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2007-11-17 02:48:01 +00:00
parent d0763b9159
commit b51b4b5fdf
1 changed files with 6 additions and 2 deletions
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8
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -1028,8 +1028,12 @@ unsigned LoopStrengthReduce::CheckForIVReuse(bool HasBaseReg,
const std::vector<BasedUser>& UsersToProcess) { const std::vector<BasedUser>& UsersToProcess) {
if (SCEVConstant *SC = dyn_cast<SCEVConstant>(Stride)) { if (SCEVConstant *SC = dyn_cast<SCEVConstant>(Stride)) {
int64_t SInt = SC->getValue()->getSExtValue(); int64_t SInt = SC->getValue()->getSExtValue();
for (std::map<SCEVHandle, IVsOfOneStride>::iterator SI= IVsByStride.begin(), for (unsigned NewStride = 0, e = StrideOrder.size(); NewStride != e;
SE = IVsByStride.end(); SI != SE; ++SI) { ++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(); int64_t SSInt = cast<SCEVConstant>(SI->first)->getValue()->getSExtValue();
if (SI->first != Stride && if (SI->first != Stride &&
(unsigned(abs(SInt)) < SSInt || (SInt % SSInt) != 0)) (unsigned(abs(SInt)) < SSInt || (SInt % SSInt) != 0))