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llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
| Show First 20 Lines • Show All 91 Lines • ▼ Show 20 Lines | |||||
| // some N^2 behavior in pathological cases. | // some N^2 behavior in pathological cases. | ||||
| ICWorklist.reserve(InstrsForInstCombineWorklist.size()); | ICWorklist.reserve(InstrsForInstCombineWorklist.size()); | ||||
| for (Instruction *Inst : reverse(InstrsForInstCombineWorklist)) { | for (Instruction *Inst : reverse(InstrsForInstCombineWorklist)) { | ||||
| // DCE instruction if trivially dead. As we iterate in reverse program | // DCE instruction if trivially dead. As we iterate in reverse program | ||||
| // order here, we will clean up whole chains of dead instructions. | // order here, we will clean up whole chains of dead instructions. | ||||
| if (isInstructionTriviallyDead(Inst, TLI)) { | if (isInstructionTriviallyDead(Inst, TLI)) { | ||||
| ++NumDeadInst; | ++NumDeadInst; | ||||
| LLVM_DEBUG(dbgs() << "IC: DCE: " << *Inst << '\n'); | LLVM_DEBUG(dbgs() << "IC: DCE: " << *Inst << '\n'); | ||||
| salvageDebugInfoOrMarkUndef(*Inst); | salvageDebugInfo(*Inst); | ||||
| Inst->eraseFromParent(); | Inst->eraseFromParent(); | ||||
| MadeIRChange = true; | MadeIRChange = true; | ||||
| continue; | continue; | ||||
| } | } | ||||
| ICWorklist.push(Inst); | ICWorklist.push(Inst); | ||||
| } | } | ||||
| ▲ Show 20 Lines • Show All 91 Lines • Show Last 20 Lines | |||||