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Fix another lsr-is-nondeterministic case

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23695 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-10-11 18:17:57 +00:00
parent a179ab3016
commit b4dd1b86fa
1 changed files with 10 additions and 6 deletions
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16
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -970,19 +970,23 @@ void LoopStrengthReduce::OptimizeIndvars(Loop *L) {
IVStrideUse *CondUse = 0;
const SCEVHandle *CondStride = 0;
for (std::map<SCEVHandle, IVUsersOfOneStride>::iterator
I = IVUsesByStride.begin(), E = IVUsesByStride.end();
I != E && !CondUse; ++I)
for (std::vector<IVStrideUse>::iterator UI = I->second.Users.begin(),
E = I->second.Users.end(); UI != E; ++UI)
for (unsigned Stride = 0, e = StrideOrder.size(); Stride != e && !CondUse;
++Stride) {
std::map<SCEVHandle, IVUsersOfOneStride>::iterator SI =
IVUsesByStride.find(StrideOrder[Stride]);
assert(SI != IVUsesByStride.end() && "Stride doesn't exist!");
for (std::vector<IVStrideUse>::iterator UI = SI->second.Users.begin(),
E = SI->second.Users.end(); UI != E; ++UI)
if (UI->User == Cond) {
CondUse = &*UI;
CondStride = &I->first;
CondStride = &SI->first;
// NOTE: we could handle setcc instructions with multiple uses here, but
// InstCombine does it as well for simple uses, it's not clear that it
// occurs enough in real life to handle.
break;
}
}
if (!CondUse) return; // setcc doesn't use the IV.
// setcc stride is complex, don't mess with users.