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Fix this code to avoid dereferencing an end() iterator in

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offset distributions it doesn't expect.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96002 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-02-12 19:20:37 +00:00
parent b98e160318
commit cd045c08ca
1 changed files with 5 additions and 1 deletions
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6
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -2271,6 +2271,10 @@ void LSRInstance::GenerateCrossUseConstantOffsets() {
const SCEV *Reg = *I;
const ImmMapTy &Imms = Map.find(Reg)->second;
// It's not worthwhile looking for reuse if there's only one offset.
if (Imms.size() == 1)
continue;
DEBUG(dbgs() << "Generating cross-use offsets for " << *Reg << ':';
for (ImmMapTy::const_iterator J = Imms.begin(), JE = Imms.end();
J != JE; ++J)
@ -2299,7 +2303,7 @@ void LSRInstance::GenerateCrossUseConstantOffsets() {
};
for (size_t i = 0, e = array_lengthof(OtherImms); i != e; ++i) {
ImmMapTy::const_iterator M = OtherImms[i];
if (M == J) continue;
if (M == J || M == JE) continue;
// Compute the difference between the two.
int64_t Imm = (uint64_t)JImm - M->first;