Tim Northover 8f2a85e099 IR: add "cmpxchg weak" variant to support permitted failure. ... This commit adds a weak variant of the cmpxchg operation, as described in C++11. A cmpxchg instruction with this modifier is permitted to fail to store, even if the comparison indicated it should. As a result, cmpxchg instructions must return a flag indicating success in addition to their original iN value loaded. Thus, for uniformity *all* cmpxchg instructions now return "{ iN, i1 }". The second flag is 1 when the store succeeded. At the DAG level, a new ATOMIC_CMP_SWAP_WITH_SUCCESS node has been added as the natural representation for the new cmpxchg instructions. It is a strong cmpxchg. By default this gets Expanded to the existing ATOMIC_CMP_SWAP during Legalization, so existing backends should see no change in behaviour. If they wish to deal with the enhanced node instead, they can call setOperationAction on it. Beware: as a node with 2 results, it cannot be selected from TableGen. Currently, no use is made of the extra information provided in this patch. Test updates are almost entirely adapting the input IR to the new scheme. Summary for out of tree users: ------------------------------ + Legacy Bitcode files are upgraded during read. + Legacy assembly IR files will be invalid. + Front-ends must adapt to different type for "cmpxchg". + Backends should be unaffected by default. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210903 91177308-0d34-0410-b5e6-96231b3b80d8		2014-06-13 14:24:07 +00:00
..
ArgumentPromotion.cpp	[C++] Use 'nullptr'. Transforms edition.	2014-04-25 05:29:35 +00:00
BarrierNoopPass.cpp	[C++11] Add 'override' keyword to virtual methods that override their base class.	2014-03-05 09:10:37 +00:00
CMakeLists.txt	Introduce a BarrierNoop pass, a hack designed to allow *some* control	2012-10-18 08:05:46 +00:00
ConstantMerge.cpp	[C++] Use 'nullptr'. Transforms edition.	2014-04-25 05:29:35 +00:00
DeadArgumentElimination.cpp	Add a <tuple> include to more files that aren't getting it transitively on MSVC.	2014-04-30 07:21:01 +00:00
ExtractGV.cpp	GlobalValue: Assert symbols with local linkage have default visibility	2014-05-07 23:00:22 +00:00
FunctionAttrs.cpp	When analyzing params/args for readnone/readonly, don't forget to consider that a pointer argument may be passed through a callsite to the return, and that we may need to analyze it. Fixes a bug reported on llvm-dev: http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-May/073098.html	2014-05-30 02:31:27 +00:00
GlobalDCE.cpp	[C++11] Use 'nullptr'.	2014-06-08 22:29:17 +00:00
GlobalOpt.cpp	Fix most of PR10367.	2014-05-16 19:35:39 +00:00
InlineAlways.cpp	Check the alwaysinline attribute on the call as well as on the caller.	2014-05-19 18:25:54 +00:00
Inliner.cpp	Add support for missed and analysis optimization remarks.	2014-05-22 14:19:46 +00:00
InlineSimple.cpp	[C++] Use 'nullptr'. Transforms edition.	2014-04-25 05:29:35 +00:00
Internalize.cpp	LTO: -internalize sets visibility to default	2014-05-05 17:40:44 +00:00
IPConstantPropagation.cpp	[C++] Use 'nullptr'. Transforms edition.	2014-04-25 05:29:35 +00:00
IPO.cpp	Removing spurious dependency of IPO on JumpInstrTables	2014-06-05 19:43:57 +00:00
LLVMBuild.txt	Prune redundant dependencies in LLVMBuild.txt.	2013-12-11 00:30:57 +00:00
LoopExtractor.cpp	[C++] Use 'nullptr'. Transforms edition.	2014-04-25 05:29:35 +00:00
Makefile
MergeFunctions.cpp	IR: add "cmpxchg weak" variant to support permitted failure.	2014-06-13 14:24:07 +00:00
PartialInlining.cpp	[C++] Use 'nullptr'. Transforms edition.	2014-04-25 05:29:35 +00:00
PassManagerBuilder.cpp	Add LoadCombine pass.	2014-05-29 01:55:07 +00:00
PruneEH.cpp	[C++] Use 'nullptr'. Transforms edition.	2014-04-25 05:29:35 +00:00
StripDeadPrototypes.cpp	[Modules] Fix potential ODR violations by sinking the DEBUG_TYPE	2014-04-22 02:55:47 +00:00
StripSymbols.cpp	[C++] Use 'nullptr'. Transforms edition.	2014-04-25 05:29:35 +00:00