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14 Commits

Author SHA1 Message Date
Dan Gohman df476e5e93 Make provenance checking conservative in cases when 
pointers-to-strong-pointers may be in play. These can lead to retains and
releases happening in unstructured ways, foiling the optimizer. This fixes
rdar://12150909.

llvm-svn: 163180
 2012-09-04 23:16:20 +00:00
Benjamin Kramer 2f47a3fb07 Fix broken check lines. 
I really need to find a way to automate this, but I can't come up with a regex
that has no false positives while handling tricky cases like custom check
prefixes.

llvm-svn: 162097
 2012-08-17 12:28:26 +00:00
Dan Gohman f64ff8ed3a An objc_retain can serve as a may-use for a different pointer. 
rdar://11931823.

llvm-svn: 160637
 2012-07-23 19:27:31 +00:00
Dan Gohman 8478d76d64 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 500b598c5c 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 728db4997a 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 bd944b4153 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 6a144a2227 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 1736c14b85 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
Bill Wendling e6174a2c85 Update more tests to the new EH scheme. 
llvm-svn: 138894
 2011-08-31 21:04:11 +00:00
Dan Gohman 56e1cef705 Constant pointers to objects don't need reference counting. 
llvm-svn: 138242
 2011-08-22 17:29:11 +00:00
Dan Gohman bce94fded8 Make a few tests slightly more strict. 
llvm-svn: 138241
 2011-08-22 17:27:02 +00:00
Dan Gohman b38940135b 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
John McCall d935e9c359 The ARC language-specific optimizer. Credit to Dan Gohman. 
llvm-svn: 133108
 2011-06-15 23:37:01 +00:00