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| author | Bob Wilson <bob.wilson@apple.com> | 2009-11-16 18:54:08 +0000 |
|---|---|---|
| committer | Bob Wilson <bob.wilson@apple.com> | 2009-11-16 18:54:08 +0000 |
| commit | f4ae3216ba93bd253044cdcbfa7e7645677de6d7 (patch) | |
| tree | e3781bf6ccbd50f7b9ec4c1643e2ed24c6d45020 /lib/CodeGen/BranchFolding.cpp | |
| parent | c81c2552bd5410dee67cbf3cb220fbac2ed3c2ac (diff) | |
| download | external_llvm-f4ae3216ba93bd253044cdcbfa7e7645677de6d7.zip external_llvm-f4ae3216ba93bd253044cdcbfa7e7645677de6d7.tar.gz external_llvm-f4ae3216ba93bd253044cdcbfa7e7645677de6d7.tar.bz2 | |
Fix some comments.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@88932 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/BranchFolding.cpp')
| -rw-r--r-- | lib/CodeGen/BranchFolding.cpp | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp index 81e7a97..1defbf6 100644 --- a/lib/CodeGen/BranchFolding.cpp +++ b/lib/CodeGen/BranchFolding.cpp @@ -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 && |