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Give PhiCp nodes better names in many cases.

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Simplify InsertPhiElimInstructions(), and give it a better doxygen comment.

llvm-svn: 13880
This commit is contained in:
Brian Gaeke 2004-05-28 19:34:00 +00:00
parent 2bd005cb45
commit 403be90321
1 changed files with 7 additions and 19 deletions
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26
lib/Target/SparcV9/InstrSelection/InstrSelection.cpp
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@ -220,8 +220,7 @@ InstructionSelection::InsertCodeForPhis(Function &F) {
for (MachineFunction::iterator BB = MF.begin(); BB != MF.end(); ++BB) {
for (BasicBlock::const_iterator IIt = BB->getBasicBlock()->begin();
const PHINode *PN = dyn_cast<PHINode>(IIt); ++IIt) {
// FIXME: This is probably wrong...
Value *PhiCpRes = new PHINode(PN->getType(), "PhiCp:");
Value *PhiCpRes = new PHINode(PN->getType(), PN->getName() + ":PhiCp");
// The leak detector shouldn't track these nodes. They are not garbage,
// even though their parent field is never filled in.
@ -254,11 +253,10 @@ InstructionSelection::InsertCodeForPhis(Function &F) {
} // for all BBs in function
}
//-------------------------------------------------------------------------
// Thid method inserts a copy instruction to a predecessor BB as a result
// of phi elimination.
//-------------------------------------------------------------------------
/// InsertPhiElimInstructions - Inserts the instructions in CpVec into the
/// MachineBasicBlock corresponding to BB, just before its terminator
/// instruction. This is used by InsertCodeForPhis() to insert copies, above.
///
void
InstructionSelection::InsertPhiElimInstructions(BasicBlock *BB,
const std::vector<MachineInstr*>& CpVec)
@ -268,19 +266,9 @@ InstructionSelection::InsertPhiElimInstructions(BasicBlock *BB,
MachineInstr *FirstMIOfTerm = MC4Term.front();
assert (FirstMIOfTerm && "No Machine Instrs for terminator");
MachineFunction &MF = MachineFunction::get(BB->getParent());
// FIXME: if PHI instructions existed in the machine code, this would be
// unnecessary.
MachineBasicBlock *MBB = 0;
for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
if (I->getBasicBlock() == BB) {
MBB = I;
break;
}
MachineBasicBlock *MBB = FirstMIOfTerm->getParent();
assert(MBB && "Machine BB for predecessor's terminator not found");
MachineBasicBlock::iterator MCIt = FirstMIOfTerm;
assert(MCIt != MBB->end() && "Start inst of terminator not found");
// insert the copy instructions just before the first machine instruction