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[MachinePipeliner] Fix use-after-free coping values of the same DenseMap #130311

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Merged
merged 4 commits into from
Mar 7, 2025
Merged

[MachinePipeliner] Fix use-after-free coping values of the same DenseMap #130311

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[𝘀𝗽𝗿] initial version
vitalybuka Mar 7, 2025
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less copying
vitalybuka Mar 7, 2025
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undo
vitalybuka Mar 7, 2025
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llvm::
vitalybuka Mar 7, 2025
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7 changes: 5 additions & 2 deletions llvm/lib/CodeGen/ModuloSchedule.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -410,8 +410,11 @@ void ModuloScheduleExpander::generateExistingPhis(
Register NewReg = VRMap[PrevStage][LoopVal];
rewriteScheduledInstr(NewBB, InstrMap, CurStageNum, 0, &*BBI, Def,
InitVal, NewReg);
if (VRMap[CurStageNum].count(LoopVal))
VRMap[CurStageNum][Def] = VRMap[CurStageNum][LoopVal];
auto It = VRMap[CurStageNum].find(LoopVal);
if (It != VRMap[CurStageNum].end()) {
llvm::Register Reg = It->second;
VRMap[CurStageNum][Def] = Reg;
}
}
// Adjust the number of Phis needed depending on the number of prologs left,
// and the distance from where the Phi is first scheduled. The number of
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