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author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-05-21 16:32:16 +0000 |
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committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-05-21 16:32:16 +0000 |
commit | 63e6a488cb6c29983415221719d05fbf99e00193 (patch) | |
tree | 336aa66061fa65fe95627b929b5d5ec0a58eb2e6 /lib/CodeGen/MachineInstr.cpp | |
parent | d8a33ddcfeb29e7ec792b14be946a05ab998a38e (diff) | |
download | llvm-63e6a488cb6c29983415221719d05fbf99e00193.tar.gz llvm-63e6a488cb6c29983415221719d05fbf99e00193.tar.bz2 llvm-63e6a488cb6c29983415221719d05fbf99e00193.tar.xz |
If the first definition of a virtual register is a partial redef, add an
<imp-def> operand for the full register. This ensures that the full physical
register is marked live after register allocation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104320 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineInstr.cpp')
-rw-r--r-- | lib/CodeGen/MachineInstr.cpp | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp index 553b13938c..595fddda6f 100644 --- a/lib/CodeGen/MachineInstr.cpp +++ b/lib/CodeGen/MachineInstr.cpp @@ -1388,11 +1388,21 @@ bool MachineInstr::addRegisterDead(unsigned IncomingReg, void MachineInstr::addRegisterDefined(unsigned IncomingReg, const TargetRegisterInfo *RegInfo) { - MachineOperand *MO = findRegisterDefOperand(IncomingReg, false, RegInfo); - if (!MO || MO->getSubReg()) - addOperand(MachineOperand::CreateReg(IncomingReg, - true /*IsDef*/, - true /*IsImp*/)); + if (TargetRegisterInfo::isPhysicalRegister(IncomingReg)) { + MachineOperand *MO = findRegisterDefOperand(IncomingReg, false, RegInfo); + if (MO) + return; + } else { + for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { + const MachineOperand &MO = getOperand(i); + if (MO.isReg() && MO.getReg() == IncomingReg && MO.isDef() && + MO.getSubReg() == 0) + return; + } + } + addOperand(MachineOperand::CreateReg(IncomingReg, + true /*IsDef*/, + true /*IsImp*/)); } unsigned |