Michael Gottesman 0d92a3c600 [ObjCARC] Strength reduce objc_retainBlock -> objc_retain if the objc_retainBlock is optimizable. ... If an objc_retainBlock has the copy_on_escape metadata attached to it AND if the block pointer argument only escapes down the stack, we are allowed to strength reduce the objc_retainBlock to to an objc_retain and thus optimize it. Current there is logic in the ARC data flow analysis to handle this case which is complicated and involved making distinctions in between objc_retainBlock and objc_retain in certain places and considering them the same in others. This patch simplifies said code by: 1. Performing the strength reduction in the initial ARC peephole analysis (ObjCARCOpts::OptimizeIndividualCalls). 2. Changes the ARC dataflow analysis (which runs after the peephole analysis) to consider all objc_retainBlock calls to not be optimizable (since if the call was optimizable, we would have strength reduced it already). This patch leaves in the infrastructure in the ARC dataflow analysis to handle this case, which due to 2 will just be dead code. I am doing this on purpose to separate the removal of the old code from the testing of the new code. <rdar://problem/13249661>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178284 91177308-0d34-0410-b5e6-96231b3b80d8		2013-03-28 20:11:19 +00:00
..
CMakeLists.txt
DependencyAnalysis.cpp
DependencyAnalysis.h
LLVMBuild.txt
Makefile
ObjCARC.cpp
ObjCARC.h	Changed isNullOrUndef => IsNullOrUndef and isNoopInstruction => IsNoopInstruction so that all helper functions are named similarly in ObjCARC.h.	2013-03-25 09:27:43 +00:00
ObjCARCAliasAnalysis.cpp
ObjCARCAliasAnalysis.h
ObjCARCAPElim.cpp
ObjCARCContract.cpp	Changed isNullOrUndef => IsNullOrUndef and isNoopInstruction => IsNoopInstruction so that all helper functions are named similarly in ObjCARC.h.	2013-03-25 09:27:43 +00:00
ObjCARCExpand.cpp
ObjCARCOpts.cpp	[ObjCARC] Strength reduce objc_retainBlock -> objc_retain if the objc_retainBlock is optimizable.	2013-03-28 20:11:19 +00:00
ObjCARCUtil.cpp	[ObjCARC Annotations] Added support for displaying the state of pointers at the bottom/top of BBs of the ARC dataflow analysis for both bottomup and topdown analyses.	2013-03-26 00:42:09 +00:00
ProvenanceAnalysis.cpp
ProvenanceAnalysis.h