e7a243fea5
Add a new ObjC ARC optimization pass to eliminate unneeded
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autorelease push+pop pairs.
llvm-svn: 148330
2012-01-17 20:52:24 +00:00
728db4997a
Implement proper ObjC ARC objc_retainBlock "escape" analysis, so that
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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.
llvm-svn: 148076
2012-01-13 00:39:07 +00:00
bd944b4153
It turns out that clang does use pointer-to-function types to
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point to ARC-managed pointers sometimes. This fixes rdar://10551239.
llvm-svn: 146577
2011-12-14 19:10:53 +00:00
6a144a2227
Upgrade syntax of tests using volatile instructions to use 'load volatile' instead of 'volatile load', which is archaic.
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llvm-svn: 145171
2011-11-27 06:54:59 +00:00
a7107f992e
Teach the ARC optimizer about the !clang.arc.copy_on_escape metadata
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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
1736c14b85
Suppress partial retain+release elimination when there's a
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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
4ac148dcbc
When eliminating unnecessary retain+autorelease on return values,
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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
2053a5dd64
Don't eliminate objc_retainBlock calls on stack objects if the
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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
d4b5e3a4d9
objc_retainBlock is not NoModRef because it can update forwarding pointers
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in memory relevant to the optimizer. rdar://10050579.
llvm-svn: 139708
2011-09-14 18:13:00 +00:00
e6174a2c85
Update more tests to the new EH scheme.
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llvm-svn: 138894
2011-08-31 21:04:11 +00:00
56e1cef705
Constant pointers to objects don't need reference counting.
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llvm-svn: 138242
2011-08-22 17:29:11 +00:00
bce94fded8
Make a few tests slightly more strict.
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llvm-svn: 138241
2011-08-22 17:27:02 +00:00
b38940135b
Track a retain+release nesting level independently of the
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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.
llvm-svn: 138016
2011-08-19 00:26:36 +00:00
02e737b08e
Move "atomic" and "volatile" designations on instructions after the opcode
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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
10a18d55ce
Don't convert objc_autoreleaseReturnValue to objc_autorelease if the result
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is returned through a bitcast.
llvm-svn: 137402
2011-08-12 00:36:31 +00:00
121302772d
Don't let arbitrary calls disrupt nested retain+release pairs if
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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.
llvm-svn: 137399
2011-08-12 00:26:31 +00:00
b24a1d29cb
Tidy up these testcases to look more like real code does.
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llvm-svn: 137085
2011-08-09 00:33:11 +00:00
6320f52ff4
Move the last uses of RetainFunc etc. over to using getRetainCallee() etc.
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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
00fa9634d5
Fix ARCOpt to insert releases on both successors of an invoke rather
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than trying to insert them immediately after the invoke.
llvm-svn: 133188
2011-06-16 20:57:14 +00:00
d935e9c359
The ARC language-specific optimizer. Credit to Dan Gohman.
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llvm-svn: 133108
2011-06-15 23:37:01 +00:00
Dan Gohman