From 082d35136105fd061ed66182bd76cd96ffeda18d Mon Sep 17 00:00:00 2001 From: Owen Anderson Date: Fri, 26 Sep 2008 18:50:46 +0000 Subject: [PATCH] We don't need to insert copies for implicit_def's. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56674 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/StrongPHIElimination.cpp | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/lib/CodeGen/StrongPHIElimination.cpp b/lib/CodeGen/StrongPHIElimination.cpp index 33bfa57b1cd..f6aa44e2346 100644 --- a/lib/CodeGen/StrongPHIElimination.cpp +++ b/lib/CodeGen/StrongPHIElimination.cpp @@ -419,7 +419,6 @@ void StrongPHIElimination::processBlock(MachineBasicBlock* MBB) { MachineBasicBlock::iterator P = MBB->begin(); while (P != MBB->end() && P->getOpcode() == TargetInstrInfo::PHI) { unsigned DestReg = P->getOperand(0).getReg(); - // Don't both doing PHI elimination for dead PHI's. if (P->registerDefIsDead(DestReg)) { @@ -448,6 +447,11 @@ void StrongPHIElimination::processBlock(MachineBasicBlock* MBB) { ProcessedNames.insert(SrcReg); continue; } + + // We don't need to insert copies for implicit_defs. + MachineInstr* DefMI = MRI.getVRegDef(SrcReg); + if (DefMI->getOpcode() == TargetInstrInfo::IMPLICIT_DEF) + ProcessedNames.insert(SrcReg); // Check for trivial interferences via liveness information, allowing us // to avoid extra work later. Any registers that interfere cannot both -- 2.11.0