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34 Commits

Author SHA1 Message Date
Dan Gohman
d5743c7fd0 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.

llvm-svn: 154682
 2012-04-13 18:28:58 +00:00
Dan Gohman
81ac0c921f 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.

llvm-svn: 154647
 2012-04-13 01:08:28 +00:00
Dan Gohman
6a5b02f8ee Don't move objc_autorelease calls past autorelease pool boundaries when 
optimizing autorelease calls on phi nodes with null operands.
This fixes rdar://11207070.

llvm-svn: 154642
 2012-04-13 00:59:57 +00:00
Dan Gohman
a5e2200b2a Fix accidentally inverted logic from r152803, and make the 
testcase slightly less trivial. This fixes rdar://11171718.

llvm-svn: 154118
 2012-04-05 20:27:21 +00:00
Dan Gohman
ef28237798 Don't convert objc_retainAutoreleasedReturnValue to objc_retain if it 
is retaining the return value of an invoke that it immediately follows.

llvm-svn: 153344
 2012-03-23 18:09:00 +00:00
Dan Gohman
0c02608af1 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.

llvm-svn: 153343
 2012-03-23 17:47:54 +00:00
Rafael Espindola
ac42573389 Short term fix for pr12270 before we change dominates to handle unreachable 
code.
While here, reduce indentation.

llvm-svn: 152803
 2012-03-15 15:52:59 +00:00
Dan Gohman
a30e1f4576 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.

llvm-svn: 152748
 2012-03-14 23:05:06 +00:00
Dan Gohman
784659a39f 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.

llvm-svn: 152421
 2012-03-09 18:50:52 +00:00
Dan Gohman
71b80f9e8c 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.

llvm-svn: 150829
 2012-02-17 18:59:53 +00:00
Eli Bendersky
4afdeeb682 Replace all instances of dg.exp file with lit.local.cfg, since all tests are run with LIT now and now Dejagnu. dg.exp is no longer needed. 
Patch reviewed by Daniel Dunbar. It will be followed by additional cleanup patches.

llvm-svn: 150664
 2012-02-16 06:28:33 +00:00
Dan Gohman
20fd978e4b 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.

llvm-svn: 150424
 2012-02-13 22:57:02 +00:00
Dan Gohman
9bb84ffb6c Set the "tail" flag on pattern-matched objc_storeStrong calls. 
rdar://10531041.

llvm-svn: 148490
 2012-01-19 19:14:36 +00:00
Dan Gohman
48f4e5752e Use llvm.global_ctors to locate global constructors instead 
of recognizing them by name.

llvm-svn: 148416
 2012-01-18 21:19:38 +00:00
Dan Gohman
9b37a5592c Add a new ObjC ARC optimization pass to eliminate unneeded 
autorelease push+pop pairs.

llvm-svn: 148330
 2012-01-17 20:52:24 +00:00
Dan Gohman
922244c634 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.

llvm-svn: 148076
 2012-01-13 00:39:07 +00:00
Dan Gohman
e9572aa680 It turns out that clang does use pointer-to-function types to 
point to ARC-managed pointers sometimes. This fixes rdar://10551239.

llvm-svn: 146577
 2011-12-14 19:10:53 +00:00
Chris Lattner
9d1e8420ff Upgrade syntax of tests using volatile instructions to use 'load volatile' instead of 'volatile load', which is archaic. 
llvm-svn: 145171
 2011-11-27 06:54:59 +00:00
Dan Gohman
5e2d8538d7 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.

llvm-svn: 142298
 2011-10-17 22:53:25 +00:00
Dan Gohman
13624a6c83 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

llvm-svn: 142222
 2011-10-17 18:48:25 +00:00
Dan Gohman
7dca165e93 When eliminating unnecessary retain+autorelease on return values, 
handle the case where the retain is in a different basic block.
rdar://10210274.

llvm-svn: 140815
 2011-09-29 22:27:34 +00:00
Dan Gohman
2df048a94b 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.

llvm-svn: 140814
 2011-09-29 22:25:23 +00:00
Dan Gohman
223fdfc56f objc_retainBlock is not NoModRef because it can update forwarding pointers 
in memory relevant to the optimizer. rdar://10050579.

llvm-svn: 139708
 2011-09-14 18:13:00 +00:00
Bill Wendling
722de8a9aa Update more tests to the new EH scheme. 
llvm-svn: 138894
 2011-08-31 21:04:11 +00:00
Dan Gohman
9619488506 Constant pointers to objects don't need reference counting. 
llvm-svn: 138242
 2011-08-22 17:29:11 +00:00
Dan Gohman
48e3f904c3 Make a few tests slightly more strict. 
llvm-svn: 138241
 2011-08-22 17:27:02 +00:00
Dan Gohman
c5d64c76e0 Track a retain+release nesting level independently of the 
known-incremented level, because the two concepts can be used
to prove the saftey of a retain+release removal in different
ways.

llvm-svn: 138016
 2011-08-19 00:26:36 +00:00
Eli Friedman
baf0f69f9a Move "atomic" and "volatile" designations on instructions after the opcode 
of the instruction.

Note that this change affects the existing non-atomic load and store
instructions; the parser now accepts both forms, and the change is noted
in the release notes.

llvm-svn: 137527
 2011-08-12 22:50:01 +00:00
Dan Gohman
c188a47b62 Don't convert objc_autoreleaseReturnValue to objc_autorelease if the result 
is returned through a bitcast.

llvm-svn: 137402
 2011-08-12 00:36:31 +00:00
Dan Gohman
783fdc6375 Don't let arbitrary calls disrupt nested retain+release pairs if 
the retains and releases all use the same SSA pointer value.

Also, don't let CFG hazards disrupt nested retain+release pair
optimizations.

llvm-svn: 137399
 2011-08-12 00:26:31 +00:00
Dan Gohman
a716e5c67e Tidy up these testcases to look more like real code does. 
llvm-svn: 137085
 2011-08-09 00:33:11 +00:00
Dan Gohman
1c4dff0ab3 Move the last uses of RetainFunc etc. over to using getRetainCallee() etc. 
so that a declaration for objc_retain is created when needed if it doesn't
already exist. rdar://9825114.

llvm-svn: 135821
 2011-07-22 22:29:21 +00:00
Dan Gohman
c9b4620575 Fix ARCOpt to insert releases on both successors of an invoke rather 
than trying to insert them immediately after the invoke.

llvm-svn: 133188
 2011-06-16 20:57:14 +00:00
John McCall
519c63cdeb The ARC language-specific optimizer. Credit to Dan Gohman. 
llvm-svn: 133108
 2011-06-15 23:37:01 +00:00