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Codegen: Tail Duplication: Only duplicate into layout pred if it is a CFG Pred.

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Add a check that the layout predecessor of a block is an actual CFG
predecssor of the block as well. No current code fails this check, but
upcoming patches can trigger this, and it makes sense to separate it
out.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276066 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kyle Butt 2016-07-20 00:01:51 +00:00
parent 98e46ef19c
commit 3d7281b8c9
1 changed files with 2 additions and 0 deletions
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2
lib/CodeGen/TailDuplicator.cpp
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@ -824,6 +824,8 @@ bool TailDuplicator::tailDuplicate(MachineFunction &MF, bool IsSimple,
// This has to check PrevBB->succ_size() because EH edges are ignored by
// AnalyzeBranch.
if (PrevBB->succ_size() == 1 &&
// Layout preds are not always CFG preds. Check.
*PrevBB->succ_begin() == TailBB &&
!TII->analyzeBranch(*PrevBB, PriorTBB, PriorFBB, PriorCond, true) &&
PriorCond.empty() && !PriorTBB && TailBB->pred_size() == 1 &&
!TailBB->hasAddressTaken()) {