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| author | Rafael Espindola <rafael.espindola@gmail.com> | 2011-06-22 04:01:58 +0000 |
|---|---|---|
| committer | Rafael Espindola <rafael.espindola@gmail.com> | 2011-06-22 04:01:58 +0000 |
| commit | c9be25726114b43ac03a4f8f84b537c21ee2bd6d (patch) | |
| tree | 9b71ac0e92949c30242616737dbc5d2b6ec5c218 /lib/CodeGen/TailDuplication.cpp | |
| parent | 6332fdef158802d271c294aeec50e0b4e8095365 (diff) | |
| download | llvm-c9be25726114b43ac03a4f8f84b537c21ee2bd6d.tar.gz llvm-c9be25726114b43ac03a4f8f84b537c21ee2bd6d.tar.bz2 llvm-c9be25726114b43ac03a4f8f84b537c21ee2bd6d.tar.xz | |
Reenable the optimization added in 133415, but change the definition of a "simple" bb to
be one with only one unconditional branch and no phis. Duplicating the phis in this case
is possible, but requeres liveness analysis or breaking edges.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133607 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/TailDuplication.cpp')
| -rw-r--r-- | lib/CodeGen/TailDuplication.cpp | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/CodeGen/TailDuplication.cpp b/lib/CodeGen/TailDuplication.cpp index d16369a4ca..6e832d99ef 100644 --- a/lib/CodeGen/TailDuplication.cpp +++ b/lib/CodeGen/TailDuplication.cpp @@ -568,9 +568,9 @@ bool TailDuplicatePass::isSimpleBB(MachineBasicBlock *TailBB) { if (TailBB->succ_size() != 1) return false; - MachineBasicBlock::iterator I = TailBB->getFirstNonPHI(); + MachineBasicBlock::iterator I = TailBB->begin(); MachineBasicBlock::iterator E = TailBB->end(); - while (I->isDebugValue() && I != E) + while (I != E && I->isDebugValue()) ++I; if (I == E) return true; @@ -712,7 +712,7 @@ TailDuplicatePass::TailDuplicate(MachineBasicBlock *TailBB, MachineFunction &MF, DenseSet<unsigned> UsedByPhi; getRegsUsedByPHIs(*TailBB, &UsedByPhi); - if (0 && isSimpleBB(TailBB)) + if (isSimpleBB(TailBB)) return duplicateSimpleBB(TailBB, TDBBs, UsedByPhi, Copies); // Iterate through all the unique predecessors and tail-duplicate this |