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Instead of setting up the CFG edges at selectiondag construction time, set

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them up after the code has been emitted.  This allows targets to select one
mbb as multiple mbb's as needed.

llvm-svn: 20937
This commit is contained in:
Chris Lattner 2005-03-30 01:10:47 +00:00
parent 46c4246df1
commit abb59a3c21
1 changed files with 15 additions and 7 deletions
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22
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -414,7 +414,6 @@ void SelectionDAGLowering::visitRet(ReturnInst &I) {
void SelectionDAGLowering::visitBr(BranchInst &I) {
// Update machine-CFG edges.
MachineBasicBlock *Succ0MBB = FuncInfo.MBBMap[I.getSuccessor(0)];
CurMBB->addSuccessor(Succ0MBB);
// Figure out which block is immediately after the current one.
MachineBasicBlock *NextBlock = 0;
@ -429,7 +428,6 @@ void SelectionDAGLowering::visitBr(BranchInst &I) {
DAG.getBasicBlock(Succ0MBB)));
} else {
MachineBasicBlock *Succ1MBB = FuncInfo.MBBMap[I.getSuccessor(1)];
CurMBB->addSuccessor(Succ1MBB);
SDOperand Cond = getValue(I.getCondition());
@ -893,7 +891,8 @@ LowerArguments(BasicBlock *BB, SelectionDAGLowering &SDL,
// anything special.
if (OldRoot != SDL.DAG.getRoot()) {
unsigned a = 0;
for (Function::arg_iterator AI = F.arg_begin(), E = F.arg_end(); AI != E; ++AI,++a)
for (Function::arg_iterator AI = F.arg_begin(), E = F.arg_end();
AI != E; ++AI,++a)
if (!AI->use_empty()) {
SDL.setValue(AI, Args[a]);
SDOperand Copy =
@ -904,7 +903,8 @@ LowerArguments(BasicBlock *BB, SelectionDAGLowering &SDL,
// Otherwise, if any argument is only accessed in a single basic block,
// emit that argument only to that basic block.
unsigned a = 0;
for (Function::arg_iterator AI = F.arg_begin(), E = F.arg_end(); AI != E; ++AI,++a)
for (Function::arg_iterator AI = F.arg_begin(), E = F.arg_end();
AI != E; ++AI,++a)
if (!AI->use_empty()) {
if (BasicBlock *BBU = IsOnlyUsedInOneBasicBlock(AI)) {
FuncInfo.BlockLocalArguments.insert(std::make_pair(BBU,
@ -1058,8 +1058,8 @@ void SelectionDAGISel::SelectBasicBlock(BasicBlock *LLVMBB, MachineFunction &MF,
DEBUG(std::cerr << "Legalized selection DAG:\n");
DEBUG(DAG.dump());
// Finally, instruction select all of the operations to machine code, adding
// the code to the MachineBasicBlock.
// Third, instruction select all of the operations to machine code, adding the
// code to the MachineBasicBlock.
InstructionSelectBasicBlock(DAG);
if (ViewDAGs) DAG.viewGraph();
@ -1067,7 +1067,7 @@ void SelectionDAGISel::SelectBasicBlock(BasicBlock *LLVMBB, MachineFunction &MF,
DEBUG(std::cerr << "Selected machine code:\n");
DEBUG(BB->dump());
// Finally, now that we know what the last MBB the LLVM BB expanded is, update
// Next, now that we know what the last MBB the LLVM BB expanded is, update
// PHI nodes in successors.
for (unsigned i = 0, e = PHINodesToUpdate.size(); i != e; ++i) {
MachineInstr *PHI = PHINodesToUpdate[i].first;
@ -1076,4 +1076,12 @@ void SelectionDAGISel::SelectBasicBlock(BasicBlock *LLVMBB, MachineFunction &MF,
PHI->addRegOperand(PHINodesToUpdate[i].second);
PHI->addMachineBasicBlockOperand(BB);
}
// Finally, add the CFG edges from the last selected MBB to the successor
// MBBs.
TerminatorInst *TI = LLVMBB->getTerminator();
for (unsigned i = 0, e = TI->getNumSuccessors(); i != e; ++i) {
MachineBasicBlock *Succ0MBB = FuncInfo.MBBMap[TI->getSuccessor(i)];
BB->addSuccessor(Succ0MBB);
}
}