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When accessing the base register for global variables, use the register

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directly rather than making a copy for the register allocator to coalesce.
This kills thousands of live intervals across the testsuite.

llvm-svn: 17946
This commit is contained in:
Nate Begeman 2004-11-18 06:51:29 +00:00
parent ccd7bfb561
commit 3e1aaef2b5
1 changed files with 13 additions and 19 deletions
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32
lib/Target/PowerPC/PPC32ISelSimple.cpp
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@ -417,12 +417,12 @@ 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.
/// getGlobalBaseReg - Output the instructions required to put the
/// base address to use for accessing globals into a register. Returns the
/// register containing the base address.
///
void copyGlobalBaseToRegister(MachineBasicBlock *MBB,
MachineBasicBlock::iterator IP,
unsigned R);
unsigned getGlobalBaseReg(MachineBasicBlock *MBB,
MachineBasicBlock::iterator IP);
/// copyConstantToRegister - Output the instructions required to put the
/// specified constant into the specified register.
@ -587,12 +587,11 @@ unsigned PPC32ISel::getFixedSizedAllocaFI(AllocaInst *AI) {
}
/// copyGlobalBaseToRegister - Output the instructions required to put the
/// getGlobalBaseReg - Output the instructions required to put the
/// base address to use for accessing globals into a register.
///
void PPC32ISel::copyGlobalBaseToRegister(MachineBasicBlock *MBB,
MachineBasicBlock::iterator IP,
unsigned R) {
unsigned PPC32ISel::getGlobalBaseReg(MachineBasicBlock *MBB,
MachineBasicBlock::iterator IP) {
if (!GlobalBaseInitialized) {
// Insert the set of GlobalBaseReg into the first MBB of the function
MachineBasicBlock &FirstMBB = F->front();
@ -602,10 +601,7 @@ void PPC32ISel::copyGlobalBaseToRegister(MachineBasicBlock *MBB,
BuildMI(FirstMBB, MBBI, PPC::MFLR, 1, GlobalBaseReg).addReg(PPC::LR);
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);
return GlobalBaseReg;
}
/// copyConstantToRegister - Output the instructions required to put the
@ -691,9 +687,8 @@ void PPC32ISel::copyConstantToRegister(MachineBasicBlock *MBB,
unsigned Reg1 = makeAnotherReg(Type::IntTy);
unsigned Opcode = (Ty == Type::FloatTy) ? PPC::LFS : PPC::LFD;
// Move value at base + distance into return reg
copyGlobalBaseToRegister(MBB, IP, GlobalBase);
BuildMI(*MBB, IP, PPC::LOADHiAddr, 2, Reg1).addReg(GlobalBase)
.addConstantPoolIndex(CPI);
BuildMI(*MBB, IP, PPC::LOADHiAddr, 2, Reg1)
.addReg(getGlobalBaseReg(MBB, IP)).addConstantPoolIndex(CPI);
BuildMI(*MBB, IP, Opcode, 2, R).addConstantPoolIndex(CPI).addReg(Reg1);
} else if (isa<ConstantPointerNull>(C)) {
// Copy zero (null pointer) to the register.
@ -708,9 +703,8 @@ void PPC32ISel::copyConstantToRegister(MachineBasicBlock *MBB,
|| dyn_cast<Function>(GV)) ? PPC::LWZ : PPC::LA;
// Move value at base + distance into return reg
copyGlobalBaseToRegister(MBB, IP, GlobalBase);
BuildMI(*MBB, IP, PPC::LOADHiAddr, 2, TmpReg).addReg(GlobalBase)
.addGlobalAddress(GV);
BuildMI(*MBB, IP, PPC::LOADHiAddr, 2, TmpReg)
.addReg(getGlobalBaseReg(MBB, IP)).addGlobalAddress(GV);
BuildMI(*MBB, IP, Opcode, 2, R).addGlobalAddress(GV).addReg(TmpReg);
// Add the GV to the list of things whose addresses have been taken.