diff options
Diffstat (limited to 'lib/CodeGen/StackSlotColoring.cpp')
| -rw-r--r-- | lib/CodeGen/StackSlotColoring.cpp | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/lib/CodeGen/StackSlotColoring.cpp b/lib/CodeGen/StackSlotColoring.cpp index bae828a2263c1..234b2043a6a14 100644 --- a/lib/CodeGen/StackSlotColoring.cpp +++ b/lib/CodeGen/StackSlotColoring.cpp @@ -381,7 +381,6 @@ bool StackSlotColoring::RemoveDeadStores(MachineBasicBlock* MBB) { I != E; ++I) { if (DCELimit != -1 && (int)NumDead >= DCELimit) break; - int FirstSS, SecondSS; if (TII->isStackSlotCopy(*I, FirstSS, SecondSS) && FirstSS == SecondSS && FirstSS != -1) { @@ -392,12 +391,18 @@ bool StackSlotColoring::RemoveDeadStores(MachineBasicBlock* MBB) { } MachineBasicBlock::iterator NextMI = std::next(I); - if (NextMI == MBB->end()) continue; + MachineBasicBlock::iterator ProbableLoadMI = I; unsigned LoadReg = 0; unsigned StoreReg = 0; if (!(LoadReg = TII->isLoadFromStackSlot(*I, FirstSS))) continue; + // Skip the ...pseudo debugging... instructions between a load and store. + while ((NextMI != E) && NextMI->isDebugValue()) { + ++NextMI; + ++I; + } + if (NextMI == E) continue; if (!(StoreReg = TII->isStoreToStackSlot(*NextMI, SecondSS))) continue; if (FirstSS != SecondSS || LoadReg != StoreReg || FirstSS == -1) continue; @@ -407,7 +412,7 @@ bool StackSlotColoring::RemoveDeadStores(MachineBasicBlock* MBB) { if (NextMI->findRegisterUseOperandIdx(LoadReg, true, nullptr) != -1) { ++NumDead; - toErase.push_back(&*I); + toErase.push_back(&*ProbableLoadMI); } toErase.push_back(&*NextMI); |