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Add some comments suggested in code review.

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llvm-svn: 159800
This commit is contained in:
Jakob Stoklund Olesen 2012-07-06 02:31:22 +00:00
parent a072350ac2
commit 8f9719a55e
1 changed files with 7 additions and 0 deletions
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7
lib/CodeGen/EarlyIfConversion.cpp
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@ -167,6 +167,9 @@ bool SSAIfConv::canSpeculateInstrs(MachineBasicBlock *MBB) {
}
unsigned InstrCount = 0;
// Check all instructions, except the terminators. It is assumed that
// terminators never have side effects or define any used register values.
for (MachineBasicBlock::iterator I = MBB->begin(),
E = MBB->getFirstTerminator(); I != E; ++I) {
if (I->isDebugValue())
@ -569,11 +572,15 @@ bool EarlyIfConverter::runOnMachineFunction(MachineFunction &MF) {
bool Changed = false;
IfConv.runOnMachineFunction(MF);
// Initially visit blocks in layout order. The tryConvertIf() function may
// erase blocks, but never the head block passed as MFI.
for (MachineFunction::iterator MFI = MF.begin(), MFE = MF.end(); MFI != MFE;
++MFI)
if (tryConvertIf(MFI))
Changed = true;
// Revisit blocks identified by tryConvertIf() as candidates for nested
// if-conversion.
DEBUG(dbgs() << "Revisiting " << WorkList.size() << " blocks.\n");
while (!WorkList.empty())
tryConvertIf(WorkList.pop_back_val());