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Fix some comments. 

llvm-svn: 88932
This commit is contained in:
Bob Wilson 2009-11-16 18:54:08 +00:00
parent 3794ec2519
commit 1a8ea98b76
1 changed files with 4 additions and 5 deletions
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9
llvm/lib/CodeGen/BranchFolding.cpp
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@ -1025,8 +1025,8 @@ static bool IsBetterFallthrough(MachineBasicBlock *MBB1,
return MBB2I->getDesc().isCall() && !MBB1I->getDesc().isCall();
}
/// TailDuplicate - MBB unconditionally branches to SuccBB. If it is profitable,
/// duplicate SuccBB's contents in MBB to eliminate the branch.
/// TailDuplicate - If it is profitable, duplicate TailBB's contents in each
/// of its predecessors.
bool BranchFolder::TailDuplicate(MachineBasicBlock *TailBB,
bool PrevFallsThrough,
MachineFunction &MF) {
@ -1048,7 +1048,7 @@ bool BranchFolder::TailDuplicate(MachineBasicBlock *TailBB,
1 : (TailMergeSize - 1);
// Check the instructions in the block to determine whether tail-duplication
// is invalid or unlikely to be unprofitable.
// is invalid or unlikely to be profitable.
unsigned i = 0;
bool HasCall = false;
for (MachineBasicBlock::iterator I = TailBB->begin();
@ -1088,7 +1088,7 @@ bool BranchFolder::TailDuplicate(MachineBasicBlock *TailBB,
// EH edges are ignored by AnalyzeBranch.
if (PredBB->succ_size() != 1)
continue;
// Don't duplicate into a fall-through predecessor unless its the
// Don't duplicate into a fall-through predecessor unless it's the
// only predecessor.
if (PredBB->isLayoutSuccessor(TailBB) &&
PrevFallsThrough &&
@ -1317,7 +1317,6 @@ ReoptimizeBlock:
}
}
// If this branch is the only thing in its block, see if we can forward
// other blocks across it.
if (CurTBB && CurCond.empty() && CurFBB == 0 &&