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Revert previous change, and be really anal about what physical registers can do.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7588 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-08-05 00:49:09 +00:00
parent 02beda1221
commit d9ac6a7d3b
1 changed files with 18 additions and 26 deletions
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44
lib/CodeGen/RegAllocLocal.cpp
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@ -232,28 +232,25 @@ void RA::removePhysReg(unsigned PhysReg) {
///
void RA::spillVirtReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator &I,
unsigned VirtReg, unsigned PhysReg) {
assert((VirtReg || DisableKill) && "Spilling a physical register is illegal!"
" Must not have appropriate kill for the register or use exists beyond"
" the intended one.");
DEBUG(std::cerr << " Spilling register " << RegInfo->getName(PhysReg);
std::cerr << " containing %reg" << VirtReg;
if (!isVirtRegModified(VirtReg))
std::cerr << " which has not been modified, so no store necessary!");
DEBUG(std::cerr << " Spilling register " << RegInfo->getName(PhysReg));
if (VirtReg == 0) {
DEBUG(std::cerr << " which corresponds to no vreg, "
<< "must be spurious physreg: ignoring (WARNING)\n");
} else {
DEBUG(std::cerr << " containing %reg" << VirtReg;
if (!isVirtRegModified(VirtReg))
std::cerr << " which has not been modified, so no store necessary!");
// Otherwise, there is a virtual register corresponding to this physical
// register. We only need to spill it into its stack slot if it has been
// modified.
if (isVirtRegModified(VirtReg)) {
const TargetRegisterClass *RC = MF->getSSARegMap()->getRegClass(VirtReg);
int FrameIndex = getStackSpaceFor(VirtReg, RC);
DEBUG(std::cerr << " to stack slot #" << FrameIndex);
RegInfo->storeRegToStackSlot(MBB, I, PhysReg, FrameIndex, RC);
++NumSpilled; // Update statistics
}
Virt2PhysRegMap.erase(VirtReg); // VirtReg no longer available
// Otherwise, there is a virtual register corresponding to this physical
// register. We only need to spill it into its stack slot if it has been
// modified.
if (isVirtRegModified(VirtReg)) {
const TargetRegisterClass *RC = MF->getSSARegMap()->getRegClass(VirtReg);
int FrameIndex = getStackSpaceFor(VirtReg, RC);
DEBUG(std::cerr << " to stack slot #" << FrameIndex);
RegInfo->storeRegToStackSlot(MBB, I, PhysReg, FrameIndex, RC);
++NumSpilled; // Update statistics
}
Virt2PhysRegMap.erase(VirtReg); // VirtReg no longer available
DEBUG(std::cerr << "\n");
removePhysReg(PhysReg);
@ -510,12 +507,7 @@ void RA::AllocateBasicBlock(MachineBasicBlock &MBB) {
if (PhysReg) {
DEBUG(std::cerr << " Last use of " << RegInfo->getName(PhysReg)
<< "[%reg" << VirtReg <<"], removing it from live set\n");
// If the physical register was used, but there was no definition of
// the physical register (we are reading garbage), Live Variables will
// tell us that this is the last use of the register even though we
// don't know of anything in the register. No need to remove it.
if (VirtReg != PhysReg || PhysRegsUsed.count(PhysReg))
removePhysReg(PhysReg);
removePhysReg(PhysReg);
}
}
}