of a precise count. Also, move RRInfo's Partial field into PtrState,
now that it won't increase the size.
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These lists exclude invoke unwind edges and loop backedges which
are being ignored. This makes it easier to ignore them
consistently.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155500 91177308-0d34-0410-b5e6-96231b3b80d8
library return value optimization for phi uses. Even when the
phi itself is not dominated, the specific use may be dominated.
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same basic block, and it's not safe to insert code in the successor
blocks if the edges are critical edges. Splitting those edges is
possible, but undesirable, especially on the unwind side. Instead,
make the bottom-up code motion to consider invokes to be part of
their successor blocks, rather than part of their parent blocks, so
that it doesn't push code past them and onto the edges. This fixes
PR12307.
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traversal, consider nodes for which the only successors are backedges
which the traversal is ignoring to be exit nodes. This fixes a problem
where the bottom-up traversal was failing to visit split blocks along
split loop backedges. This fixes rdar://10989035.
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can insert a new element, invalidating iterators. Use find
instead, and handle the case where the key is not found explicitly.
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metadata may still unwind, but only in ways that the ARC
optimizer doesn't need to consider. This permits more
aggressive optimization.
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the optimizer doesn't eliminate objc_retainBlock calls which are needed
for their side effect of copying blocks onto the heap.
This implements rdar://10361249.
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detected in the forward-CFG DFS. This prevents the reverse-CFG from
visiting blocks inside loops after blocks that dominate them in the
case where loops have multiple exits.
No testcase, because this fixes a bug which in practice only shows
up in a full optimizer run, due to the use-list order.
This fixes rdar://10422791 and others.
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possibility that it will span multiple CFG diamonds/triangles which
could have different controlling predicates. rdar://10282956
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objc_retainBlock call is potentially responsible for copying
the block to the heap to extend its lifetime. rdar://10209613.
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No tests; these changes aren't really interesting in the sense that the logic is the same for volatile and atomic.
I believe this completes all of the changes necessary for the optimizer to handle loads and stores correctly. I'm going to try and come up with some additional testing, though.
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known-incremented level, because the two concepts can be used
to prove the saftey of a retain+release removal in different
ways.
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the retains and releases all use the same SSA pointer value.
Also, don't let CFG hazards disrupt nested retain+release pair
optimizations.
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