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68 Commits

Author SHA1 Message Date
Dan Gohman
ce5d8b0d03 Fix replacing all the users of objc weak runtime routines 
when deleting them. rdar://11434915.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157080 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-05-18 22:17:29 +00:00
Dan Gohman
95b8cf1f11 Fix the objc_storeStrong recognizer to stop before walking off the 
end of a basic block if there's no store.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156520 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-05-09 23:08:33 +00:00
Craig Topper
b12af898c3 Remove unused variable to get rid of warning. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156466 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-05-09 07:08:58 +00:00
Dan Gohman
0daef3d902 Miscellaneous accumulated cleanups. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156445 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-05-08 23:39:44 +00:00
Dan Gohman
4670dace66 Fix objc_storeStrong pattern matching to catch a potential use of the 
old value after the store but before it is released.
This fixes rdar:/11116986.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156442 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-05-08 23:34:08 +00:00
Dan Gohman
447989cb68 Miscellaneous accumulated cleanups. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155725 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-04-27 18:56:31 +00:00
Dan Gohman
50ade65982 Simplify the known retain count tracking; use a boolean state instead 
of a precise count. Also, move RRInfo's Partial field into PtrState,
now that it won't increase the size.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155513 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-04-25 00:50:46 +00:00
Dan Gohman
eeeb7752a8 Build custom predecessor and successor lists for each basic block. 
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
 2012-04-24 22:53:18 +00:00
Dan Gohman
8b74e5afda Avoid a bug in the path count computation, preventing an infinite 
loop repeatedlt making the same change. This is for rdar://11256239.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155160 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-04-19 21:50:46 +00:00
Dan Gohman
3b5b2a22ca Don't crash on code where the user put __attribute__((constructor)) on 
a function with arguments. This fixes rdar://11265785.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155073 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-04-18 22:24:33 +00:00
Dan Gohman
d6bf201fa2 Add some comments, and fix a few places that missed setting Changed. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154687 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-04-13 18:57:48 +00:00
Dan Gohman
4423477548 Consider ObjC runtime calls objc_storeWeak and others which make a copy of 
their argument as "escape" points for objc_retainBlock optimization.
This fixes rdar://11229925.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154682 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-04-13 18:28:58 +00:00
Dan Gohman
6c189ecbe6 Use the new Use-aware dominates method to apply the objc runtime 
library return value optimization for phi uses. Even when the
phi itself is not dominated, the specific use may be dominated.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154647 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-04-13 01:08:28 +00:00
Dan Gohman
511568dd1f Don't move objc_autorelease calls past autorelease pool boundaries when 
optimizing autorelease calls on phi nodes with null operands.
This fixes rdar://11207070.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154642 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-04-13 00:59:57 +00:00
Dan Gohman
036ebfd874 Fix accidentally inverted logic from r152803, and make the 
testcase slightly less trivial. This fixes rdar://11171718.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154118 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-04-05 20:27:21 +00:00
Francois Pichet
b54a5eda6d Fix the MSVC build. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153366 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-03-24 01:36:37 +00:00
Dan Gohman
6fedb3c401 Don't convert objc_retainAutoreleasedReturnValue to objc_retain if it 
is retaining the return value of an invoke that it immediately follows.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153344 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-03-23 18:09:00 +00:00
Dan Gohman
fbab4a8c8a It's not possible to insert code immediately after an invoke in the 
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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153343 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-03-23 17:47:54 +00:00
Dan Gohman
c7f5c6e0e3 Refactor the code for visiting instructions out into helper functions. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153267 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-03-22 18:24:56 +00:00
Rafael Espindola
2453dff96a Short term fix for pr12270 before we change dominates to handle unreachable 
code.
While here, reduce indentation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152803 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-03-15 15:52:59 +00:00
Dan Gohman
8b11fdd8bb When an invoke is marked with metadata indicating its unwind edge 
should be ignored by ARC optimization, don't insert new ARC runtime
calls in the unwind destination.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152748 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-03-14 23:05:06 +00:00
Dan Gohman
5992f67e68 When identifying exit nodes for the reverse-CFG reverse-post-order 
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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152421 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-03-09 18:50:52 +00:00
Dan Gohman
70e2968866 Fix an iterator invalidation problem. operator[] on a DenseMap 
can insert a new element, invalidating iterators. Use find
instead, and handle the case where the key is not found explicitly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151871 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-03-02 01:26:46 +00:00
Dan Gohman
22cc4ccc9e Misc micro-optimizations. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151869 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-03-02 01:13:53 +00:00
Dan Gohman
dbe266be35 Calls and invokes with the new clang.arc.no_objc_arc_exceptions 
metadata may still unwind, but only in ways that the ARC
optimizer doesn't need to consider. This permits more
aggressive optimization.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150829 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-02-17 18:59:53 +00:00
Dan Gohman
a3b08d68bd Just like in regular escape analysis, loads and stores through 
(but not of) a block pointer do not cause the block pointer to
escape. This fixes rdar://10803830.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150424 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-02-13 22:57:02 +00:00
David Blaikie
4d6ccb5f68 More dead code removal (using -Wunreachable-code) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148578 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-01-20 21:51:11 +00:00
Dan Gohman
0cdece4389 Set the "tail" flag on pattern-matched objc_storeStrong calls. 
rdar://10531041.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148490 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-01-19 19:14:36 +00:00
Dan Gohman
2f77bbd1bf Add a depth limit to avoid runaway recursion. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148419 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-01-18 21:24:45 +00:00
Dan Gohman
1dae3e965c Use llvm.global_ctors to locate global constructors instead 
of recognizing them by name.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148416 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-01-18 21:19:38 +00:00
Dan Gohman
2f6263c96a Add a new ObjC ARC optimization pass to eliminate unneeded 
autorelease push+pop pairs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148330 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-01-17 20:52:24 +00:00
David Blaikie
fdebc38523 Remove unreachable code. (replace with llvm_unreachable to help GCC where necessary) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148284 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-01-17 04:43:56 +00:00
Dan Gohman
92180988a4 Fix an unused variable warning that Chad noticed. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148164 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-01-14 00:47:44 +00:00
Dan Gohman
79522dc569 Implement proper ObjC ARC objc_retainBlock "escape" analysis, so that 
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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148076 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-01-13 00:39:07 +00:00
Dan Gohman
483716015f Fix a copy+pasto. No testcase, because the symptoms of dereferencing 
an invalid iterator aren't reproducible.  rdar://10614085.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147098 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-12-21 21:43:50 +00:00
Dan Gohman
f9096e450b It turns out that clang does use pointer-to-function types to 
point to ARC-managed pointers sometimes. This fixes rdar://10551239.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146577 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-12-14 19:10:53 +00:00
Dan Gohman
59a1c93e95 When computing reverse-CFG reverse-post-order, skip backedges, as 
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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146408 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-12-12 19:42:25 +00:00
Dan Gohman
afee027766 Add a TODO comment. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146389 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-12-12 18:30:26 +00:00
Dan Gohman
62e5b4064b Fix a copy+pasto in a comment. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146385 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-12-12 18:20:00 +00:00
Dan Gohman
8a9eebe6b9 Use getArgOperand instead of getOperand on a call. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146384 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-12-12 18:19:12 +00:00
Dan Gohman
28588ff7aa Inline SetSeqToRelease into its only caller, since it's more clear that way. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146383 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-12-12 18:16:56 +00:00
Dan Gohman
2e68beb36a Fix omitted break statements in a switch. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146380 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-12-12 18:13:53 +00:00
Dan Gohman
a974beaa1f Teach the ARC optimizer about the !clang.arc.copy_on_escape metadata 
tag on objc_retainBlock calls, which indicates that they may be
optimized away. rdar://10211286.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142298 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-10-17 22:53:25 +00:00
Dan Gohman
90b8bcd33a Suppress partial retain+release elimination when there's a 
possibility that it will span multiple CFG diamonds/triangles which
could have different controlling predicates.  rdar://10282956


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142222 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-10-17 18:48:25 +00:00
Dan Gohman
27e0666725 When eliminating unnecessary retain+autorelease on return values, 
handle the case where the retain is in a different basic block.
rdar://10210274.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140815 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-09-29 22:27:34 +00:00
Dan Gohman
597fece886 Don't eliminate objc_retainBlock calls on stack objects if the 
objc_retainBlock call is potentially responsible for copying
the block to the heap to extend its lifetime. rdar://10209613.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140814 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-09-29 22:25:23 +00:00
Dan Gohman
1d2fd75e3b Don't mark objc_retainBlock as nounwind. It calls user copy constructors 
which could theoretically throw.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139710 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-09-14 18:33:34 +00:00
Dan Gohman
211048286b objc_retainBlock is not NoModRef because it can update forwarding pointers 
in memory relevant to the optimizer. rdar://10050579.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139708 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-09-14 18:13:00 +00:00
Eli Friedman
2bc3d52b9a Change a bunch of isVolatile() checks to check for atomic load/store as well. 
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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139533 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-09-12 20:23:13 +00:00
Bill Wendling
89d4411cef When inserting new instructions, use getFirstInsertionPt instead of 
getFirstNonPHI so that it will skip over the landingpad instructions as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138537 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-08-25 01:08:34 +00:00