From 8c139a51259aed287c5e2c16bd10d799a25d43dd Mon Sep 17 00:00:00 2001 From: Jakob Stoklund Olesen Date: Thu, 26 Jan 2012 17:52:15 +0000 Subject: Clear kill flags before propagating a copy. The live range of the source register may be extended when a redundant copy is eliminated. Make sure any kill flags between the two copies are cleared. This fixes PR11765. llvm-svn: 149069 --- llvm/lib/CodeGen/MachineInstr.cpp | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'llvm/lib/CodeGen/MachineInstr.cpp') diff --git a/llvm/lib/CodeGen/MachineInstr.cpp b/llvm/lib/CodeGen/MachineInstr.cpp index 18e9f1a..c281cd1 100644 --- a/llvm/lib/CodeGen/MachineInstr.cpp +++ b/llvm/lib/CodeGen/MachineInstr.cpp @@ -1707,6 +1707,20 @@ bool MachineInstr::addRegisterKilled(unsigned IncomingReg, return Found; } +void MachineInstr::clearRegisterKills(unsigned Reg, + const TargetRegisterInfo *RegInfo) { + if (!TargetRegisterInfo::isPhysicalRegister(Reg)) + RegInfo = 0; + for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { + MachineOperand &MO = getOperand(i); + if (!MO.isReg() || !MO.isUse() || !MO.isKill()) + continue; + unsigned OpReg = MO.getReg(); + if (OpReg == Reg || (RegInfo && RegInfo->isSuperRegister(Reg, OpReg))) + MO.setIsKill(false); + } +} + bool MachineInstr::addRegisterDead(unsigned IncomingReg, const TargetRegisterInfo *RegInfo, bool AddIfNotFound) { -- cgit v1.1