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Switch this instruction selector over to using liveins and liveouts, eliminating 

implicit defs on entry to the function.  yaay :)

llvm-svn: 21184
This commit is contained in:
Chris Lattner 2005-04-09 16:32:30 +00:00
parent 1a44855f8f
commit a55a5f2580
1 changed files with 26 additions and 8 deletions
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34
llvm/lib/Target/PowerPC/PPC32ISelSimple.cpp
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@ -729,7 +729,8 @@ void PPC32ISel::LoadArgumentsToVirtualRegs(Function &Fn) {
MachineFrameInfo *MFI = F->getFrameInfo();
for (Function::arg_iterator I = Fn.arg_begin(), E = Fn.arg_end(); I != E; ++I) {
for (Function::arg_iterator I = Fn.arg_begin(), E = Fn.arg_end();
I != E; ++I) {
bool ArgLive = !I->use_empty();
unsigned Reg = ArgLive ? getReg(*I) : 0;
int FI; // Frame object index
@ -739,7 +740,7 @@ void PPC32ISel::LoadArgumentsToVirtualRegs(Function &Fn) {
if (ArgLive) {
FI = MFI->CreateFixedObject(4, ArgOffset);
if (GPR_remaining > 0) {
BuildMI(BB, PPC::IMPLICIT_DEF, 0, GPR[GPR_idx]);
F->addLiveIn(GPR[GPR_idx]);
BuildMI(BB, PPC::OR, 2, Reg).addReg(GPR[GPR_idx])
.addReg(GPR[GPR_idx]);
} else {
@ -751,7 +752,7 @@ void PPC32ISel::LoadArgumentsToVirtualRegs(Function &Fn) {
if (ArgLive) {
FI = MFI->CreateFixedObject(4, ArgOffset);
if (GPR_remaining > 0) {
BuildMI(BB, PPC::IMPLICIT_DEF, 0, GPR[GPR_idx]);
F->addLiveIn(GPR[GPR_idx]);
BuildMI(BB, PPC::OR, 2, Reg).addReg(GPR[GPR_idx])
.addReg(GPR[GPR_idx]);
} else {
@ -763,7 +764,7 @@ void PPC32ISel::LoadArgumentsToVirtualRegs(Function &Fn) {
if (ArgLive) {
FI = MFI->CreateFixedObject(4, ArgOffset);
if (GPR_remaining > 0) {
BuildMI(BB, PPC::IMPLICIT_DEF, 0, GPR[GPR_idx]);
F->addLiveIn(GPR[GPR_idx]);
BuildMI(BB, PPC::OR, 2, Reg).addReg(GPR[GPR_idx])
.addReg(GPR[GPR_idx]);
} else {
@ -775,8 +776,8 @@ void PPC32ISel::LoadArgumentsToVirtualRegs(Function &Fn) {
if (ArgLive) {
FI = MFI->CreateFixedObject(8, ArgOffset);
if (GPR_remaining > 1) {
BuildMI(BB, PPC::IMPLICIT_DEF, 0, GPR[GPR_idx]);
BuildMI(BB, PPC::IMPLICIT_DEF, 0, GPR[GPR_idx+1]);
F->addLiveIn(GPR[GPR_idx]);
F->addLiveIn(GPR[GPR_idx+1]);
BuildMI(BB, PPC::OR, 2, Reg).addReg(GPR[GPR_idx])
.addReg(GPR[GPR_idx]);
BuildMI(BB, PPC::OR, 2, Reg+1).addReg(GPR[GPR_idx+1])
@ -798,7 +799,7 @@ void PPC32ISel::LoadArgumentsToVirtualRegs(Function &Fn) {
FI = MFI->CreateFixedObject(4, ArgOffset);
if (FPR_remaining > 0) {
BuildMI(BB, PPC::IMPLICIT_DEF, 0, FPR[FPR_idx]);
F->addLiveIn(FPR[FPR_idx]);
BuildMI(BB, PPC::FMR, 1, Reg).addReg(FPR[FPR_idx]);
FPR_remaining--;
FPR_idx++;
@ -812,7 +813,7 @@ void PPC32ISel::LoadArgumentsToVirtualRegs(Function &Fn) {
FI = MFI->CreateFixedObject(8, ArgOffset);
if (FPR_remaining > 0) {
BuildMI(BB, PPC::IMPLICIT_DEF, 0, FPR[FPR_idx]);
F->addLiveIn(FPR[FPR_idx]);
BuildMI(BB, PPC::FMR, 1, Reg).addReg(FPR[FPR_idx]);
FPR_remaining--;
FPR_idx++;
@ -843,6 +844,23 @@ void PPC32ISel::LoadArgumentsToVirtualRegs(Function &Fn) {
// llvm.va_start.
if (Fn.getFunctionType()->isVarArg())
VarArgsFrameIndex = MFI->CreateFixedObject(4, ArgOffset);
if (Fn.getReturnType() != Type::VoidTy)
switch (getClassB(Fn.getReturnType())) {
case cByte:
case cShort:
case cInt:
F->addLiveOut(PPC::R3);
break;
case cLong:
F->addLiveOut(PPC::R3);
F->addLiveOut(PPC::R4);
break;
case cFP32:
case cFP64:
F->addLiveOut(PPC::F1);
break;
}
}