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Teach SplitBlockPredecessors how to handle landingpad blocks.

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Patch by: Igor Laevsky <igor@azulsystems.com>

"Currently SplitBlockPredecessors generates incorrect code in case if basic block we are going to split has a landingpad. Also seems like it is fairly common case among it's users to conditionally call either SplitBlockPredecessors or SplitLandingPadPredecessors. Because of this I think it is reasonable to add this condition directly into SplitBlockPredecessors."

Differential Revision: http://reviews.llvm.org/D7157



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227390 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Philip Reames
2015-01-28 23:06:47 +00:00
parent 408796c672
commit 61a76b2d4a
6 changed files with 39 additions and 48 deletions
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11
lib/Transforms/Utils/LoopUnrollRuntime.cpp
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@ -119,15 +119,8 @@ static void ConnectProlog(Loop *L, Value *TripCount, unsigned Count,
assert(Exit && "Loop must have a single exit block only");
// Split the exit to maintain loop canonicalization guarantees
SmallVector<BasicBlock*, 4> Preds(pred_begin(Exit), pred_end(Exit));
if (!Exit->isLandingPad()) {
SplitBlockPredecessors(Exit, Preds, ".unr-lcssa", AA, DT, LI,
P->mustPreserveAnalysisID(LCSSAID));
} else {
SmallVector<BasicBlock*, 2> NewBBs;
SplitLandingPadPredecessors(Exit, Preds, ".unr1-lcssa", ".unr2-lcssa",
NewBBs, AA, DT, LI,
P->mustPreserveAnalysisID(LCSSAID));
}
SplitBlockPredecessors(Exit, Preds, ".unr-lcssa", AA, DT, LI,
P->mustPreserveAnalysisID(LCSSAID));
// Add the branch to the exit block (around the unrolled loop)
BranchInst::Create(Exit, NewPH, BrLoopExit, InsertPt);
InsertPt->eraseFromParent();