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| author | Rafael Espindola <rafael.espindola@gmail.com> | 2011-06-09 21:43:25 +0000 |
|---|---|---|
| committer | Rafael Espindola <rafael.espindola@gmail.com> | 2011-06-09 21:43:25 +0000 |
| commit | a899b223109ca5dba7b44439e955148a03f23d4c (patch) | |
| tree | c678fc2a89dee0522a43e2cc18c62af79d82323a /lib/CodeGen/TailDuplication.cpp | |
| parent | c2e9a50dfb523964bd9d7598ee27b37669f9a5b8 (diff) | |
| download | llvm-a899b223109ca5dba7b44439e955148a03f23d4c.tar.gz llvm-a899b223109ca5dba7b44439e955148a03f23d4c.tar.bz2 llvm-a899b223109ca5dba7b44439e955148a03f23d4c.tar.xz | |
AnalyzeBranch modifies the bb, but we don't want to modify a bb with
eh edges. Swap the order of the checks to avoid it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132806 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/TailDuplication.cpp')
| -rw-r--r-- | lib/CodeGen/TailDuplication.cpp | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/lib/CodeGen/TailDuplication.cpp b/lib/CodeGen/TailDuplication.cpp index 5fe3cb09ff..93acd5826f 100644 --- a/lib/CodeGen/TailDuplication.cpp +++ b/lib/CodeGen/TailDuplication.cpp @@ -541,13 +541,13 @@ TailDuplicatePass::TailDuplicate(MachineBasicBlock *TailBB, MachineFunction &MF, MachineBasicBlock *PredTBB, *PredFBB; SmallVector<MachineOperand, 4> PredCond; + // EH edges are ignored by AnalyzeBranch. + if (PredBB->succ_size() != 1) + continue; if (TII->AnalyzeBranch(*PredBB, PredTBB, PredFBB, PredCond, true)) continue; if (!PredCond.empty()) continue; - // EH edges are ignored by AnalyzeBranch. - if (PredBB->succ_size() != 1) - continue; // Don't duplicate into a fall-through predecessor (at least for now). if (PredBB->isLayoutSuccessor(TailBB) && PredBB->canFallThrough()) continue; @@ -603,12 +603,11 @@ TailDuplicatePass::TailDuplicate(MachineBasicBlock *TailBB, MachineFunction &MF, MachineBasicBlock *PrevBB = prior(MachineFunction::iterator(TailBB)); MachineBasicBlock *PriorTBB = 0, *PriorFBB = 0; SmallVector<MachineOperand, 4> PriorCond; - bool PriorUnAnalyzable = - TII->AnalyzeBranch(*PrevBB, PriorTBB, PriorFBB, PriorCond, true); // This has to check PrevBB->succ_size() because EH edges are ignored by // AnalyzeBranch. - if (!PriorUnAnalyzable && PriorCond.empty() && !PriorTBB && - TailBB->pred_size() == 1 && PrevBB->succ_size() == 1 && + if (PrevBB->succ_size() == 1 && + !TII->AnalyzeBranch(*PrevBB, PriorTBB, PriorFBB, PriorCond, true) && + PriorCond.empty() && !PriorTBB && TailBB->pred_size() == 1 && !TailBB->hasAddressTaken()) { DEBUG(dbgs() << "\nMerging into block: " << *PrevBB << "From MBB: " << *TailBB); |