From 26137f35958fa2237eceb06ef7003e3c19159129 Mon Sep 17 00:00:00 2001 From: Roman Divacky Date: Thu, 15 Oct 2009 07:47:49 +0000 Subject: Update llvm to r84175. --- lib/CodeGen/LiveVariables.cpp | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'lib/CodeGen/LiveVariables.cpp') diff --git a/lib/CodeGen/LiveVariables.cpp b/lib/CodeGen/LiveVariables.cpp index 139e0291ea7a..96c655c1a9b8 100644 --- a/lib/CodeGen/LiveVariables.cpp +++ b/lib/CodeGen/LiveVariables.cpp @@ -323,10 +323,21 @@ bool LiveVariables::HandlePhysRegKill(unsigned Reg, MachineInstr *MI) { // The last partial def kills the register. LastPartDef->addOperand(MachineOperand::CreateReg(Reg, false/*IsDef*/, true/*IsImp*/, true/*IsKill*/)); - else + else { + MachineOperand *MO = + LastRefOrPartRef->findRegisterDefOperand(Reg, false, TRI); + bool NeedEC = MO->isEarlyClobber() && MO->getReg() != Reg; // If the last reference is the last def, then it's not used at all. // That is, unless we are currently processing the last reference itself. LastRefOrPartRef->addRegisterDead(Reg, TRI, true); + if (NeedEC) { + // If we are adding a subreg def and the superreg def is marked early + // clobber, add an early clobber marker to the subreg def. + MO = LastRefOrPartRef->findRegisterDefOperand(Reg); + if (MO) + MO->setIsEarlyClobber(); + } + } } else if (!PhysRegUse[Reg]) { // Partial uses. Mark register def dead and add implicit def of // sub-registers which are used. -- cgit v1.3