diff options
| author | Rafael Espindola <rafael.espindola@gmail.com> | 2011-06-22 22:31:57 +0000 |
|---|---|---|
| committer | Rafael Espindola <rafael.espindola@gmail.com> | 2011-06-22 22:31:57 +0000 |
| commit | d6379a993c7e40521bd5c8c6469e32697b4c41d1 (patch) | |
| tree | 063179526e004e4912c3a7114a94378d05d80f5e /lib/CodeGen | |
| parent | aa0a8f317791b4de07a6c7a2b9705c4183052b54 (diff) | |
Reenable tail duplication of bb with just an unconditional jump, but
don't remove blocks that have their address taken.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133659 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/TailDuplication.cpp | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/lib/CodeGen/TailDuplication.cpp b/lib/CodeGen/TailDuplication.cpp index d16369a4ca..e5c23b36d2 100644 --- a/lib/CodeGen/TailDuplication.cpp +++ b/lib/CodeGen/TailDuplication.cpp @@ -207,7 +207,7 @@ bool TailDuplicatePass::TailDuplicateBlocks(MachineFunction &MF) { // TailBB's immediate successors are now successors of those predecessors // which duplicated TailBB. Add the predecessors as sources to the PHI // instructions. - bool isDead = MBB->pred_empty(); + bool isDead = MBB->pred_empty() && !MBB->hasAddressTaken(); if (PreRegAlloc) UpdateSuccessorsPHIs(MBB, isDead, TDBBs, Succs); @@ -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 |