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This patch adds and improves debugging output. No functionality changes.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17005 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-10-15 03:16:29 +00:00
parent e0c83a86b0
commit 8df6a594d2
1 changed files with 7 additions and 3 deletions
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10
lib/CodeGen/VirtRegMap.cpp
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@ -323,11 +323,13 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, const VirtRegMap &VRM) {
std::map<int, unsigned>::iterator SSI =
SpillSlotsAvailable.find(StackSlot);
if (SSI != SpillSlotsAvailable.end()) {
DEBUG(std::cerr << "Reusing SS#" << StackSlot << " from physreg "
<< MRI->getName(SSI->second) << " for vreg"
<< VirtReg <<" instead of reloading into physreg "
<< MRI->getName(VRM.getPhys(VirtReg)) << "\n");
// If this stack slot value is already available, reuse it!
PhysReg = SSI->second;
MI.SetMachineOperandReg(i, PhysReg);
DEBUG(std::cerr << "Reusing SS#" << StackSlot << " from physreg "
<< MRI->getName(SSI->second) << "\n");
// The only technical detail we have is that we don't know that
// PhysReg won't be clobbered by a reloaded stack slot that occurs
@ -519,6 +521,7 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, const VirtRegMap &VRM) {
// If there is a dead store to this stack slot, nuke it now.
MachineInstr *&LastStore = MaybeDeadStores[StackSlot];
if (LastStore) {
DEBUG(std::cerr << " Killed store:\t" << *LastStore);
++NumDSE;
MBB.erase(LastStore);
}
@ -539,7 +542,8 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, const VirtRegMap &VRM) {
PhysRegsAvailable[PhysReg] = StackSlot;
SpillSlotsAvailable[StackSlot] = PhysReg;
DEBUG(std::cerr << "Updating SS#" << StackSlot <<" in physreg "
<< MRI->getName(PhysReg) << "\n");
<< MRI->getName(PhysReg) << " for virtreg #"
<< VirtReg << "\n");
++NumStores;
VirtReg = PhysReg;