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71 Commits

Author SHA1 Message Date
Benjamin Kramer
bb30e1face Fix typos found by http://github.com/lyda/misspell-check 
llvm-svn: 157885
 2012-06-02 10:20:22 +00:00
Chris Lattner
b787e2914f Reimplement the intrinsic verifier to use the same table as Intrinsic::getDefinition, 
making it stronger and more sane.

Delete the code from tblgen that produced the old code.

Besides being a path forward in intrinsic sanity, this also eliminates a bunch of
machine generated code that was compiled into Function.o

llvm-svn: 157545
 2012-05-27 19:37:05 +00:00
Dan Gohman
992a69b57c Mark an unreachable region of code with llvm_unreachable. 
llvm-svn: 157197
 2012-05-21 17:41:28 +00:00
Dan Gohman
a487e2b57e Fix replacing all the users of objc weak runtime routines 
when deleting them. rdar://11434915.

llvm-svn: 157080
 2012-05-18 22:17:29 +00:00
Dan Gohman
9e72870dd1 Fix the objc_storeStrong recognizer to stop before walking off the 
end of a basic block if there's no store.

llvm-svn: 156520
 2012-05-09 23:08:33 +00:00
Craig Topper
749c95a942 Remove unused variable to get rid of warning. 
llvm-svn: 156466
 2012-05-09 07:08:58 +00:00
Dan Gohman
0f60d6f9b0 Miscellaneous accumulated cleanups. 
llvm-svn: 156445
 2012-05-08 23:39:44 +00:00
Dan Gohman
b47d02f929 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.

llvm-svn: 156442
 2012-05-08 23:34:08 +00:00
Dan Gohman
1bc0d2e1bc Miscellaneous accumulated cleanups. 
llvm-svn: 155725
 2012-04-27 18:56:31 +00:00
Dan Gohman
64171a0b3b 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.

llvm-svn: 155513
 2012-04-25 00:50:46 +00:00
Dan Gohman
3a24d34041 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.

llvm-svn: 155500
 2012-04-24 22:53:18 +00:00
Dan Gohman
f4472e9a1f Avoid a bug in the path count computation, preventing an infinite 
loop repeatedlt making the same change. This is for rdar://11256239.

llvm-svn: 155160
 2012-04-19 21:50:46 +00:00
Dan Gohman
a99c119e05 Don't crash on code where the user put __attribute__((constructor)) on 
a function with arguments. This fixes rdar://11265785.

llvm-svn: 155073
 2012-04-18 22:24:33 +00:00
Dan Gohman
0387e6b701 Add some comments, and fix a few places that missed setting Changed. 
llvm-svn: 154687
 2012-04-13 18:57:48 +00:00
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
Francois Pichet
6a1f32c9cf Fix the MSVC build. 
llvm-svn: 153366
 2012-03-24 01:36:37 +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
Dan Gohman
df222b2e87 Refactor the code for visiting instructions out into helper functions. 
llvm-svn: 153267
 2012-03-22 18:24:56 +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
e0e8af6739 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.

llvm-svn: 151871
 2012-03-02 01:26:46 +00:00
Dan Gohman
acbf555d2f Misc micro-optimizations. 
llvm-svn: 151869
 2012-03-02 01:13:53 +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
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
David Blaikie
06ecc99a56 More dead code removal (using -Wunreachable-code) 
llvm-svn: 148578
 2012-01-20 21:51:11 +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
7e17e84f9c Add a depth limit to avoid runaway recursion. 
llvm-svn: 148419
 2012-01-18 21:24:45 +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
David Blaikie
2526691971 Remove unreachable code. (replace with llvm_unreachable to help GCC where necessary) 
llvm-svn: 148284
 2012-01-17 04:43:56 +00:00
Dan Gohman
4539e2a975 Fix an unused variable warning that Chad noticed. 
llvm-svn: 148164
 2012-01-14 00:47:44 +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
17bd9795e9 Fix a copy+pasto. No testcase, because the symptoms of dereferencing 
an invalid iterator aren't reproducible.  rdar://10614085.

llvm-svn: 147098
 2011-12-21 21:43:50 +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
Dan Gohman
40acf5d720 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.

llvm-svn: 146408
 2011-12-12 19:42:25 +00:00
Dan Gohman
73c245acaa Add a TODO comment. 
llvm-svn: 146389
 2011-12-12 18:30:26 +00:00
Dan Gohman
9144e6bb3e Fix a copy+pasto in a comment. 
llvm-svn: 146385
 2011-12-12 18:20:00 +00:00
Dan Gohman
ee8b344c67 Use getArgOperand instead of getOperand on a call. 
llvm-svn: 146384
 2011-12-12 18:19:12 +00:00
Dan Gohman
61f78d27b0 Inline SetSeqToRelease into its only caller, since it's more clear that way. 
llvm-svn: 146383
 2011-12-12 18:16:56 +00:00
Dan Gohman
3ebb9f4498 Fix omitted break statements in a switch. 
llvm-svn: 146380
 2011-12-12 18:13:53 +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
f4d52b917e Don't mark objc_retainBlock as nounwind. It calls user copy constructors 
which could theoretically throw.

llvm-svn: 139710
 2011-09-14 18:33:34 +00:00