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
..
Analysis	BasicAA: Only query twice if the result of the more general query was MayAlias	2013-03-26 18:07:53 +00:00
Archive	Fix auto_ptr is deprecated warnings	2013-02-26 21:20:35 +00:00
AsmParser	Unify clang/llvm attributes for asan/tsan/msan (LLVM part)	2013-02-26 06:58:09 +00:00
Bitcode
CodeGen	Fix target-customized spilling in the register scavenger	2013-03-27 13:00:56 +00:00
DebugInfo	Fix missing std::. Not sure how this compiles for anyone else.	2013-03-21 00:57:21 +00:00
ExecutionEngine
IR	Revert "Adding DIImportedModules to DIScopes."	2013-03-28 02:44:59 +00:00
IRReader	Split out the IRReader header and the utility functions it provides into	2013-03-26 02:25:37 +00:00
Linker	Specutively revert r178130.	2013-03-27 17:54:41 +00:00
MC	Dead code.	2013-03-19 22:13:05 +00:00
Object	Move an assert earlier in a file and check that the result of	2013-02-28 20:26:17 +00:00
Option
Support	Don't try to generate crash diagnostics if we had an I/O failure. It's very	2013-03-27 18:30:00 +00:00
TableGen	Allow TableGen DAG arguments to be just a name.	2013-03-24 19:36:51 +00:00
Target	Hexagon: Replace switch-case in isDotNewInst with TSFlags.	2013-03-28 19:44:04 +00:00
Transforms	[ObjCARC] Strength reduce objc_retainBlock -> objc_retain if the objc_retainBlock is optimizable.	2013-03-28 20:11:19 +00:00
CMakeLists.txt	Split out the IRReader header and the utility functions it provides into	2013-03-26 02:25:37 +00:00
LLVMBuild.txt	Split out the IRReader header and the utility functions it provides into	2013-03-26 02:25:37 +00:00
Makefile	Split out the IRReader header and the utility functions it provides into	2013-03-26 02:25:37 +00:00