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* Eliminate global base register, r2 is used for that on AIX/PowerPC

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* Fix bug from 32-bit PowerPC days of 2-register long split


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15916 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Misha Brukman 2004-08-19 16:29:25 +00:00
parent 85aa4d0cc5
commit 1c514ec89d
1 changed files with 6 additions and 45 deletions
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45
lib/Target/PowerPC/PPC64ISelSimple.cpp
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@ -93,11 +93,6 @@ namespace {
// FrameIndex for the alloca.
std::map<AllocaInst*, unsigned> AllocaMap;
// A Reg to hold the base address used for global loads and stores, and a
// flag to set whether or not we need to emit it for this function.
unsigned GlobalBaseReg;
bool GlobalBaseInitialized;
ISel(TargetMachine &tm) : TM(reinterpret_cast<PPC64TargetMachine&>(tm)),
F(0), BB(0) {}
@ -158,9 +153,6 @@ namespace {
BB = &F->front();
// Make sure we re-emit a set of the global base reg if necessary
GlobalBaseInitialized = false;
// Copy incoming arguments off of the stack...
LoadArgumentsToVirtualRegs(Fn);
@ -356,13 +348,6 @@ namespace {
Value *Cond, Value *TrueVal, Value *FalseVal,
unsigned DestReg);
/// copyGlobalBaseToRegister - Output the instructions required to put the
/// base address to use for accessing globals into a register.
///
void ISel::copyGlobalBaseToRegister(MachineBasicBlock *MBB,
MachineBasicBlock::iterator IP,
unsigned R);
/// copyConstantToRegister - Output the instructions required to put the
/// specified constant into the specified register.
///
@ -507,27 +492,6 @@ unsigned ISel::getFixedSizedAllocaFI(AllocaInst *AI) {
}
/// copyGlobalBaseToRegister - Output the instructions required to put the
/// base address to use for accessing globals into a register.
///
void ISel::copyGlobalBaseToRegister(MachineBasicBlock *MBB,
MachineBasicBlock::iterator IP,
unsigned R) {
if (!GlobalBaseInitialized) {
// Insert the set of GlobalBaseReg into the first MBB of the function
MachineBasicBlock &FirstMBB = F->front();
MachineBasicBlock::iterator MBBI = FirstMBB.begin();
GlobalBaseReg = makeAnotherReg(Type::IntTy);
BuildMI(FirstMBB, MBBI, PPC::IMPLICIT_DEF, 0, PPC::LR);
BuildMI(FirstMBB, MBBI, PPC::MovePCtoLR, 0, GlobalBaseReg);
GlobalBaseInitialized = true;
}
// Emit our copy of GlobalBaseReg to the destination register in the
// current MBB
BuildMI(*MBB, IP, PPC::OR, 2, R).addReg(GlobalBaseReg)
.addReg(GlobalBaseReg);
}
/// copyConstantToRegister - Output the instructions required to put the
/// specified constant into the specified register.
///
@ -561,6 +525,7 @@ void ISel::copyConstantToRegister(MachineBasicBlock *MBB,
unsigned CPI = CP->getConstantPoolIndex(C);
BuildMI(*MBB, IP, PPC::LD, 1, R)
.addReg(PPC::R2).addConstantPoolIndex(CPI);
return;
}
assert(Class <= cInt && "Type not handled yet!");
@ -1794,10 +1759,8 @@ void ISel::emitSimpleBinaryOperation(MachineBasicBlock *MBB,
// registers and emit the appropriate opcode.
unsigned Op0r = getReg(Op0, MBB, IP);
unsigned Op1r = getReg(Op1, MBB, IP);
unsigned Opcode = OpcodeTab[OperatorClass];
BuildMI(*MBB, IP, Opcode, 2, DestReg).addReg(Op0r).addReg(Op1r);
return;
}
// ExactLog2 - This function solves for (Val == 1 << (N-1)) and returns N. It
@ -2522,7 +2485,7 @@ void ISel::emitCastOperation(MachineBasicBlock *MBB,
// PhiMBB:
// DestReg = phi [ IntTmp, OldMBB ], [ XorReg, XorMBB ]
BB = PhiMBB;
BuildMI(BB, PPC::PHI, 2, DestReg).addReg(IntTmp).addMBB(OldMBB)
BuildMI(BB, PPC::PHI, 4, DestReg).addReg(IntTmp).addMBB(OldMBB)
.addReg(XorReg).addMBB(XorMBB);
}
}
@ -2674,10 +2637,8 @@ void ISel::emitCastOperation(MachineBasicBlock *MBB,
// sbyte -1 -> ubyte 0xFFFFFFFF
BuildMI(*MBB, IP, PPC::OR, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
break;
case cLong:
++SrcReg;
// Fall through
case cInt:
case cLong:
if (DestClass == cInt)
BuildMI(*MBB, IP, PPC::OR, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
else