maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Some simpliciations to the spill/reload interface 

llvm-svn: 5067
This commit is contained in:
Chris Lattner 2002-12-15 23:01:26 +00:00
parent 4e560ee65b
commit bc1e6700eb
1 changed files with 21 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
llvm/lib/CodeGen/RegAllocSimple.cpp
View File

@ -126,14 +126,12 @@ namespace {
}
/// Moves value from memory into that register
MachineBasicBlock::iterator
moveUseToReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
unsigned VirtReg, unsigned &PhysReg);
unsigned reloadVirtReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator &I, unsigned VirtReg);
/// Saves reg value on the stack (maps virtual register to stack value)
MachineBasicBlock::iterator
saveVirtRegToStack(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
unsigned VirtReg, unsigned PhysReg);
void spillVirtReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator &I,
unsigned VirtReg, unsigned PhysReg);
};
}
@ -178,35 +176,31 @@ unsigned RegAllocSimple::getFreeReg(unsigned virtualReg) {
return getFreeReg(virtualReg);
}
MachineBasicBlock::iterator
RegAllocSimple::moveUseToReg (MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
unsigned VirtReg, unsigned &PhysReg)
{
unsigned RegAllocSimple::reloadVirtReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator &I,
unsigned VirtReg) {
const TargetRegisterClass* regClass = MF->getRegClass(VirtReg);
unsigned stackOffset = getStackSpaceFor(VirtReg, regClass);
PhysReg = getFreeReg(VirtReg);
unsigned PhysReg = getFreeReg(VirtReg);
// Add move instruction(s)
++NumReloaded;
return RegInfo->loadRegOffset2Reg(MBB, I, PhysReg,
RegInfo->getFramePointer(),
-stackOffset, regClass->getDataSize());
I = RegInfo->loadRegOffset2Reg(MBB, I, PhysReg, RegInfo->getFramePointer(),
-stackOffset, regClass->getDataSize());
return PhysReg;
}
MachineBasicBlock::iterator
RegAllocSimple::saveVirtRegToStack (MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
unsigned VirtReg, unsigned PhysReg)
void RegAllocSimple::spillVirtReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator &I,
unsigned VirtReg, unsigned PhysReg)
{
const TargetRegisterClass* regClass = MF->getRegClass(VirtReg);
unsigned stackOffset = getStackSpaceFor(VirtReg, regClass);
// Add move instruction(s)
++NumSpilled;
return RegInfo->storeReg2RegOffset(MBB, I, PhysReg,
RegInfo->getFramePointer(),
-stackOffset, regClass->getDataSize());
I = RegInfo->storeReg2RegOffset(MBB, I, PhysReg, RegInfo->getFramePointer(),
-stackOffset, regClass->getDataSize());
}
@ -322,11 +316,13 @@ void RegAllocSimple::AllocateBasicBlock(MachineBasicBlock &MBB) {
} else {
physReg = getFreeReg(virtualReg);
}
I = --saveVirtRegToStack(MBB, ++I, virtualReg, physReg);
++I;
spillVirtReg(MBB, I, virtualReg, physReg);
--I;
} else {
I = moveUseToReg(MBB, I, virtualReg, physReg);
physReg = reloadVirtReg(MBB, I, virtualReg);
Virt2PhysRegMap[virtualReg] = physReg;
}
Virt2PhysRegMap[virtualReg] = physReg;
}
MI->SetMachineOperandReg(i, physReg);
DEBUG(std::cerr << "virt: " << virtualReg <<