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acfb3584c5
llvm/test/Transforms
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Michael Gottesman acfb3584c5 [objc-arc-opts] In the presense of an alloca unconditionally remove RR pairs if and only if we are both KnownSafeBU/KnownSafeTD rather than just either or. 
In the presense of a block being initialized, the frontend will emit the
objc_retain on the original pointer and the release on the pointer loaded from
the alloca. The optimizer will through the provenance analysis realize that the
two are related (albiet different), but since we only require KnownSafe in one
direction, will match the inner retain on the original pointer with the guard
release on the original pointer. This is fixed by ensuring that in the presense
of allocas we only unconditionally remove pointers if both our retain and our
release are KnownSafe (i.e. we are KnownSafe in both directions) since we must
deal with the possibility that the frontend will emit what (to the optimizer)
appears to be unbalanced retain/releases.

An example of the miscompile is:

  %A = alloca
  retain(%x)
  retain(%x) <--- Inner Retain
  store %x, %A
  %y = load %A
  ... DO STUFF ...
  release(%y)
  call void @use(%x)
  release(%x) <--- Guarding Release

getting optimized to:

  %A = alloca
  retain(%x)
  store %x, %A
  %y = load %A
  ... DO STUFF ...
  release(%y)
  call void @use(%x)

rdar://13750319

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181743 91177308-0d34-0410-b5e6-96231b3b80d8
2013-05-13 23:49:42 +00:00
..
ADCE 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. 2012-02-16 06:28:33 +00:00
ArgumentPromotion Update some EH tests that were violating the new EH model. 2013-03-21 18:30:10 +00:00
BBVectorize Revert "InstCombine: Fold more shuffles of shuffles." 2013-05-01 00:25:27 +00:00
BlockPlacement 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. 2012-02-16 06:28:33 +00:00
BranchFolding Change tests from "opt %s" to "opt < %s" so that opt doesn't see the 2009-09-11 18:01:28 +00:00
CodeExtractor 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. 2012-02-16 06:28:33 +00:00
CodeGenPrepare Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ModuleID 2012-12-30 01:28:40 +00:00
ConstantMerge Fix const merging when an alias of a const is llvm.used. 2013-05-06 01:48:55 +00:00
ConstProp Remove this testcase until I can figure out how to properly conditionalize it. 2013-02-07 07:01:54 +00:00
CorrelatedValuePropagation CVP: If we have a PHI with an incoming select, try to skip the select. 2013-02-24 15:34:43 +00:00
DeadArgElim Revert "Revert "PR14606: debug info imported_module support"" 2013-04-22 06:12:31 +00:00
DeadStoreElimination TBAA: remove !tbaa from testing cases if not used. 2013-04-30 17:52:57 +00:00
EarlyCSE Initially forgotten-to-svn-add test case for r177279. 2013-03-18 12:07:24 +00:00
FunctionAttrs Move library call prototype attribute inference to functionattrs 2013-03-21 00:55:59 +00:00
GCOVProfiling Revert "Revert "PR14606: debug info imported_module support"" 2013-04-22 06:12:31 +00:00
GlobalDCE Revert 179826. Tests were worthless. 2013-04-19 09:32:30 +00:00
GlobalOpt Don't replace an alias in llvm.used with its target. 2013-05-09 17:22:59 +00:00
GVN Fix unchecked uses of DominatorTree in MemoryDependenceAnalysis. 2013-05-06 02:07:24 +00:00
IndVarSimplify IndVarSimplify: do not recompute an IV value outside of the loop if : 2013-03-19 20:00:22 +00:00
Inline Update test. There may be multiple catches, but those will be cleaned up. 2013-03-22 20:36:39 +00:00
InstCombine InstCombine: Flip the order of two urem transforms 2013-05-12 00:07:05 +00:00
InstSimplify ConstantFolding: ComputeMaskedBits wants the scalar size for vectors. 2013-04-19 16:56:24 +00:00
Internalize Change the internalize pass to internalize all symbols when given an empty 2012-10-26 18:47:48 +00:00
IPConstantProp Use references to attribute groups on the call/invoke instructions. 2013-02-22 09:09:42 +00:00
JumpThreading TBAA: remove !tbaa from testing cases if not used. 2013-04-30 17:52:57 +00:00
LCSSA Convert all tests using TCL-style quoting to use shell-style quoting. 2012-07-02 12:47:22 +00:00
LICM Revert the test moves from 176733. Use "REQUIRES: asserts" instead. 2013-03-12 16:27:52 +00:00
LoopDeletion Modify the LLVM assembly output so that it uses references to represent function attributes. 2013-02-20 07:21:42 +00:00
LoopIdiom PR14904: Segmentation fault running pass 'Recognize loop idioms' 2013-01-10 23:32:01 +00:00
LoopRotate Rotate multi-exit loops even if the latch was simplified. 2013-05-06 17:58:18 +00:00
LoopSimplify Convert all tests using TCL-style quoting to use shell-style quoting. 2012-07-02 12:47:22 +00:00
LoopStrengthReduce TBAA: remove !tbaa from testing cases if not used. 2013-05-02 18:11:35 +00:00
LoopUnroll Revert the test moves from 176733. Use "REQUIRES: asserts" instead. 2013-03-12 16:27:52 +00:00
LoopUnswitch TBAA: remove !tbaa from testing cases if not used. 2013-04-30 17:52:57 +00:00
LoopVectorize LoopVectorize: Use the widest induction variable type 2013-05-11 23:04:28 +00:00
LowerAtomic 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. 2012-02-16 06:28:33 +00:00
LowerExpectIntrinsic 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. 2012-02-16 06:28:33 +00:00
LowerInvoke 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. 2012-02-16 06:28:33 +00:00
LowerSwitch PR1255 related changes (case ranges): 2012-05-24 09:33:20 +00:00
Mem2Reg Revert "Adding DIImportedModules to DIScopes." 2013-03-28 02:44:59 +00:00
MemCpyOpt Use references to attribute groups on the call/invoke instructions. 2013-02-22 09:09:42 +00:00
MergeFunc TBAA: remove !tbaa from testing cases if not used. 2013-04-30 17:52:57 +00:00
MetaRenamer Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ModuleID 2013-01-01 13:57:25 +00:00
ObjCARC [objc-arc-opts] In the presense of an alloca unconditionally remove RR pairs if and only if we are both KnownSafeBU/KnownSafeTD rather than just either or. 2013-05-13 23:49:42 +00:00
PhaseOrdering Revert 179826. Tests were worthless. 2013-04-19 09:32:30 +00:00
PruneEH The normal edge of an invoke is not allowed to branch to a block with a 2012-08-10 20:55:20 +00:00
Reassociate TBAA: remove !tbaa from testing cases if not used. 2013-04-30 17:52:57 +00:00
Reg2Mem Make sure we don't emit instructions before a landingpad instruction. 2013-01-08 10:51:32 +00:00
ScalarRepl Disable the optimization about promoting vector-element-access with symbolic index. 2013-04-05 21:07:08 +00:00
SCCP Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ModuleID 2013-01-01 13:57:25 +00:00
SimplifyCFG SimplifyCFG: If convert single conditional stores 2013-04-29 21:28:24 +00:00
SimplifyLibCalls Move library call prototype attribute inference to functionattrs 2013-03-21 00:55:59 +00:00
Sink Enhance the sinking code to handle diamond patterns. Patch by 2012-05-31 08:09:49 +00:00
SLPVectorizer SLPVectorizer: Fix a bug in the code that generates extracts for values with multiple users. 2013-05-12 22:58:45 +00:00
SROA SROA: Generate selects instead of shuffles when blending values because this is the cannonical form. 2013-05-01 19:53:30 +00:00
StripSymbols Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ModuleID 2013-01-01 13:57:25 +00:00
TailCallElim Revert the test moves from 176733. Use "REQUIRES: asserts" instead. 2013-03-12 16:27:52 +00:00
TailDup Revert the test moves from 176733. Use "REQUIRES: asserts" instead. 2013-03-12 16:27:52 +00:00