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[CodeGen] Avoid repeated hash lookups (NFC) #130237

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Merged
merged 1 commit into from
Mar 7, 2025
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[CodeGen] Avoid repeated hash lookups (NFC) #130237

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17 changes: 11 additions & 6 deletions llvm/lib/CodeGen/ModuloSchedule.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -464,10 +464,12 @@ void ModuloScheduleExpander::generateExistingPhis(
InstOp1 = MRI.getVRegDef(PhiOp1);
int PhiOpStage = Schedule.getStage(InstOp1);
int StageAdj = (PhiOpStage != -1 ? PhiStage - PhiOpStage : 0);
if (PhiOpStage != -1 && PrologStage - StageAdj >= Indirects + np &&
VRMap[PrologStage - StageAdj - Indirects - np].count(PhiOp1)) {
PhiOp1 = VRMap[PrologStage - StageAdj - Indirects - np][PhiOp1];
break;
if (PhiOpStage != -1 && PrologStage - StageAdj >= Indirects + np) {
auto &M = VRMap[PrologStage - StageAdj - Indirects - np];
if (auto It = M.find(PhiOp1); It != M.end()) {
PhiOp1 = It->second;
break;
}
}
++Indirects;
}
Expand Down Expand Up @@ -597,8 +599,11 @@ void ModuloScheduleExpander::generateExistingPhis(

// Check if we need to rename a Phi that has been eliminated due to
// scheduling.
if (NumStages == 0 && IsLast && VRMap[CurStageNum].count(LoopVal))
replaceRegUsesAfterLoop(Def, VRMap[CurStageNum][LoopVal], BB, MRI, LIS);
if (NumStages == 0 && IsLast) {
auto It = VRMap[CurStageNum].find(LoopVal);
if (It != VRMap[CurStageNum].end())
replaceRegUsesAfterLoop(Def, It->second, BB, MRI, LIS);
}
}
}

Expand Down