From 595a16300c3e748424a97cef6c70c13a201ad9de Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Thu, 26 Nov 2009 00:32:36 +0000 Subject: When all defs of a vr are implicit_def, delete all of the defs. llvm-svn: 89905 --- llvm/lib/CodeGen/ProcessImplicitDefs.cpp | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'llvm/lib/CodeGen/ProcessImplicitDefs.cpp') diff --git a/llvm/lib/CodeGen/ProcessImplicitDefs.cpp b/llvm/lib/CodeGen/ProcessImplicitDefs.cpp index a484beccb9e..c9a33d88515 100644 --- a/llvm/lib/CodeGen/ProcessImplicitDefs.cpp +++ b/llvm/lib/CodeGen/ProcessImplicitDefs.cpp @@ -183,19 +183,23 @@ bool ProcessImplicitDefs::runOnMachineFunction(MachineFunction &fn) { // is not an implicit_def, do not insert implicit_def's before the // uses. bool Skip = false; + SmallVector DeadImpDefs; for (MachineRegisterInfo::def_iterator DI = mri_->def_begin(Reg), DE = mri_->def_end(); DI != DE; ++DI) { - if (DI->getOpcode() != TargetInstrInfo::IMPLICIT_DEF) { + MachineInstr *DeadImpDef = &*DI; + if (DeadImpDef->getOpcode() != TargetInstrInfo::IMPLICIT_DEF) { Skip = true; break; } + DeadImpDefs.push_back(DeadImpDef); } if (Skip) continue; // The only implicit_def which we want to keep are those that are live // out of its block. - MI->eraseFromParent(); + for (unsigned j = 0, ee = DeadImpDefs.size(); j != ee; ++j) + DeadImpDefs[j]->eraseFromParent(); Changed = true; // Process each use instruction once. -- cgit v1.2.3