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Fix PR5614: parts of a physical register def may be killed the rest.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90180 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-12-01 00:44:45 +00:00
parent d188dba149
commit a4025df42d
3 changed files with 95 additions and 3 deletions
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48
lib/CodeGen/LiveVariables.cpp
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@ -279,6 +279,43 @@ void LiveVariables::HandlePhysRegUse(unsigned Reg, MachineInstr *MI) {
PhysRegUse[SubReg] = MI;
}
/// FindLastRefOrPartRef - Return the last reference or partial reference of
/// the specified register.
MachineInstr *LiveVariables::FindLastRefOrPartRef(unsigned Reg) {
MachineInstr *LastDef = PhysRegDef[Reg];
MachineInstr *LastUse = PhysRegUse[Reg];
if (!LastDef && !LastUse)
return false;
MachineInstr *LastRefOrPartRef = LastUse ? LastUse : LastDef;
unsigned LastRefOrPartRefDist = DistanceMap[LastRefOrPartRef];
MachineInstr *LastPartDef = 0;
unsigned LastPartDefDist = 0;
for (const unsigned *SubRegs = TRI->getSubRegisters(Reg);
unsigned SubReg = *SubRegs; ++SubRegs) {
MachineInstr *Def = PhysRegDef[SubReg];
if (Def && Def != LastDef) {
// There was a def of this sub-register in between. This is a partial
// def, keep track of the last one.
unsigned Dist = DistanceMap[Def];
if (Dist > LastPartDefDist) {
LastPartDefDist = Dist;
LastPartDef = Def;
}
continue;
}
if (MachineInstr *Use = PhysRegUse[SubReg]) {
unsigned Dist = DistanceMap[Use];
if (Dist > LastRefOrPartRefDist) {
LastRefOrPartRefDist = Dist;
LastRefOrPartRef = Use;
}
}
}
return LastRefOrPartRef;
}
bool LiveVariables::HandlePhysRegKill(unsigned Reg, MachineInstr *MI) {
MachineInstr *LastDef = PhysRegDef[Reg];
MachineInstr *LastUse = PhysRegUse[Reg];
@ -373,7 +410,16 @@ bool LiveVariables::HandlePhysRegKill(unsigned Reg, MachineInstr *MI) {
if (NeedDef)
PhysRegDef[Reg]->addOperand(MachineOperand::CreateReg(SubReg,
true/*IsDef*/, true/*IsImp*/));
LastRefOrPartRef->addRegisterKilled(SubReg, TRI, true);
MachineInstr *LastSubRef = FindLastRefOrPartRef(SubReg);
if (LastSubRef)
LastSubRef->addRegisterKilled(SubReg, TRI, true);
else {
LastRefOrPartRef->addRegisterKilled(SubReg, TRI, true);
PhysRegUse[SubReg] = LastRefOrPartRef;
for (const unsigned *SSRegs = TRI->getSubRegisters(SubReg);
unsigned SSReg = *SSRegs; ++SSRegs)
PhysRegUse[SSReg] = LastRefOrPartRef;
}
for (const unsigned *SS = TRI->getSubRegisters(SubReg); *SS; ++SS)
PartUses.erase(*SS);
}