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Print instructions before register allocation is performed. Also fix 

bug where spill instructions were added to the next basic block
instead of the end of the current one if the instruction that required
the spill was the last in the block.

llvm-svn: 10272
This commit is contained in:
Alkis Evlogimenos 2003-11-30 23:40:39 +00:00
parent 0fcba7f6b3
commit 26f17e73eb
1 changed files with 26 additions and 6 deletions
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32
llvm/lib/CodeGen/RegAllocLinearScan.cpp
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@ -203,6 +203,23 @@ bool RA::runOnMachineFunction(MachineFunction &fn) {
v2pMap_.clear();
v2ssMap_.clear();
DEBUG(
for (MachineBasicBlockPtrs::iterator
mbbi = mbbs_.begin(), mbbe = mbbs_.end();
mbbi != mbbe; ++mbbi) {
MachineBasicBlock* mbb = *mbbi;
std::cerr << mbb->getBasicBlock()->getName() << '\n';
for (MachineBasicBlock::iterator
ii = mbb->begin(), ie = mbb->end();
ii != ie; ++ii) {
MachineInstr* instr = *ii;
std::cerr << "\t";
instr->print(std::cerr, *tm_);
}
}
);
// FIXME: this will work only for the X86 backend. I need to
// device an algorthm to select the minimal (considering register
// aliasing) number of temp registers to reserve so that we have 2
@ -276,12 +293,6 @@ bool RA::runOnMachineFunction(MachineFunction &fn) {
DEBUG(std::cerr << "\tinstruction: ";
(*currentInstr_)->print(std::cerr, *tm_););
DEBUG(std::cerr << "\t\tspilling temporarily defined operands "
"of previous instruction:\n");
for (unsigned i = 0, e = tempDefOperands_.size(); i != e; ++i) {
spillVirtReg(tempDefOperands_[i]);
}
tempDefOperands_.clear();
// use our current mapping and actually replace and
// virtual register with its allocated physical registers
@ -422,6 +433,15 @@ bool RA::runOnMachineFunction(MachineFunction &fn) {
(*currentInstr_)->SetMachineOperandReg(1, regA);
}
}
DEBUG(std::cerr << "\t\tspilling temporarily defined operands "
"of this instruction:\n");
++currentInstr_; // we want to insert after this instruction
for (unsigned i = 0, e = tempDefOperands_.size(); i != e; ++i) {
spillVirtReg(tempDefOperands_[i]);
}
--currentInstr_; // restore currentInstr_ iterator
tempDefOperands_.clear();
}
for (unsigned i = 0, e = p2vMap_.size(); i != e; ++i) {