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Intelligently split the landing pad block.

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We have to be careful when splitting the landing pad block, because the
landingpad instruction is required to remain as the first non-PHI of an invoke's
unwind edge. To retain this, we split the block into two blocks, moving the
predecessors within the loop to one block and the remaining predecessors to the
other. The landingpad instruction is cloned into the new blocks.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138015 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2011-08-19 00:09:22 +00:00
parent 7e8840c4d9
commit b29ec06421
1 changed files with 16 additions and 5 deletions
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21
lib/Transforms/Utils/LoopSimplify.cpp
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@ -410,13 +410,24 @@ BasicBlock *LoopSimplify::RewriteLoopExitBlock(Loop *L, BasicBlock *Exit) {
}
assert(!LoopBlocks.empty() && "No edges coming in from outside the loop?");
BasicBlock *NewBB = SplitBlockPredecessors(Exit, &LoopBlocks[0],
LoopBlocks.size(), ".loopexit",
this);
BasicBlock *NewExitBB = 0;
if (Exit->isLandingPad()) {
SmallVector<BasicBlock*, 2> NewBBs;
SplitLandingPadPredecessors(Exit, ArrayRef<BasicBlock*>(&LoopBlocks[0],
LoopBlocks.size()),
".loopexit", ".nonloopexit",
this, NewBBs);
NewExitBB = NewBBs[0];
} else {
NewExitBB = SplitBlockPredecessors(Exit, &LoopBlocks[0],
LoopBlocks.size(), ".loopexit",
this);
}
DEBUG(dbgs() << "LoopSimplify: Creating dedicated exit block "
<< NewBB->getName() << "\n");
return NewBB;
<< NewExitBB->getName() << "\n");
return NewExitBB;
}
/// AddBlockAndPredsToSet - Add the specified block, and all of its