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Sprinkle superregister <imp-def> and <imp-kill> operands when dealing with subregister indices.

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llvm-svn: 103931
This commit is contained in:
Jakob Stoklund Olesen 2010-05-17 02:49:21 +00:00
parent f9bfd996b3
commit f00cf55938
1 changed files with 28 additions and 10 deletions
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38
lib/CodeGen/RegAllocFast.cpp
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@ -151,7 +151,7 @@ namespace {
unsigned reloadVirtReg(MachineInstr *MI, unsigned OpNum,
unsigned VirtReg, unsigned Hint);
void spillAll(MachineInstr *MI);
void setPhysReg(MachineOperand &MO, unsigned PhysReg);
bool setPhysReg(MachineOperand &MO, unsigned PhysReg);
};
char RAFast::ID = 0;
}
@ -589,12 +589,32 @@ unsigned RAFast::reloadVirtReg(MachineInstr *MI, unsigned OpNum,
}
// setPhysReg - Change MO the refer the PhysReg, considering subregs.
void RAFast::setPhysReg(MachineOperand &MO, unsigned PhysReg) {
if (unsigned Idx = MO.getSubReg()) {
MO.setReg(PhysReg ? TRI->getSubReg(PhysReg, Idx) : 0);
MO.setSubReg(0);
} else
// This may invalidate MO if it is necessary to add implicit kills for a
// superregister.
// Return tru if MO kills its register.
bool RAFast::setPhysReg(MachineOperand &MO, unsigned PhysReg) {
if (!MO.getSubReg()) {
MO.setReg(PhysReg);
return MO.isKill() || MO.isDead();
}
// Handle subregister index.
MO.setReg(PhysReg ? TRI->getSubReg(PhysReg, MO.getSubReg()) : 0);
MO.setSubReg(0);
if (MO.isUse()) {
if (MO.isKill()) {
MO.getParent()->addRegisterKilled(PhysReg, TRI, true);
return true;
}
return false;
}
// A subregister def implicitly defines the whole physreg.
if (MO.isDead()) {
MO.getParent()->addRegisterDead(PhysReg, TRI, true);
return true;
}
MO.getParent()->addRegisterDefined(PhysReg, TRI);
return false;
}
void RAFast::AllocateBasicBlock() {
@ -709,8 +729,7 @@ void RAFast::AllocateBasicBlock() {
if (MO.isUse()) {
unsigned PhysReg = reloadVirtReg(MI, i, Reg, CopyDst);
CopySrc = (CopySrc == Reg || CopySrc == PhysReg) ? PhysReg : 0;
setPhysReg(MO, PhysReg);
if (MO.isKill())
if (setPhysReg(MO, PhysReg))
VirtKills.push_back(Reg);
} else if (MO.isEarlyClobber()) {
unsigned PhysReg = defineVirtReg(MI, i, Reg, 0);
@ -761,12 +780,11 @@ void RAFast::AllocateBasicBlock() {
continue;
}
unsigned PhysReg = defineVirtReg(MI, i, Reg, CopySrc);
if (MO.isDead()) {
if (setPhysReg(MO, PhysReg)) {
VirtKills.push_back(Reg);
CopyDst = 0; // cancel coalescing;
} else
CopyDst = (CopyDst == Reg || CopyDst == PhysReg) ? PhysReg : 0;
setPhysReg(MO, PhysReg);
}
// Process virtreg deads.