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8f2a85e099
llvm-6502/lib/Transforms/Scalar
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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
..
ADCE.cpp [Modules] Fix potential ODR violations by sinking the DEBUG_TYPE 2014-04-22 02:55:47 +00:00
CMakeLists.txt Add LoadCombine pass. 2014-05-29 01:55:07 +00:00
ConstantHoisting.cpp ConstantHoisting.cpp: Add <tuple> for std::tie, since r207593 removed FileSystem.h, it includes <tuple>. 2014-04-30 06:44:50 +00:00
ConstantProp.cpp [C++] Use 'nullptr'. Transforms edition. 2014-04-25 05:29:35 +00:00
CorrelatedValuePropagation.cpp [C++] Use 'nullptr'. Transforms edition. 2014-04-25 05:29:35 +00:00
DCE.cpp [Modules] Fix potential ODR violations by sinking the DEBUG_TYPE 2014-04-22 02:55:47 +00:00
DeadStoreElimination.cpp [C++] Use 'nullptr'. Transforms edition. 2014-04-25 05:29:35 +00:00
EarlyCSE.cpp [C++] Use 'nullptr'. Transforms edition. 2014-04-25 05:29:35 +00:00
FlattenCFGPass.cpp [Modules] Fix potential ODR violations by sinking the DEBUG_TYPE 2014-04-22 02:55:47 +00:00
GlobalMerge.cpp Create macro INITIALIZE_TM_PASS. 2014-06-11 07:04:37 +00:00
GVN.cpp GVN: Enable value forwarding for calloc 2014-06-12 21:16:19 +00:00
IndVarSimplify.cpp [C++] Use 'nullptr'. Transforms edition. 2014-04-25 05:29:35 +00:00
JumpThreading.cpp [C++] Use 'nullptr'. Transforms edition. 2014-04-25 05:29:35 +00:00
LICM.cpp [C++] Use 'nullptr'. 2014-04-28 04:05:08 +00:00
LLVMBuild.txt Add proper dependencies to LLVMBuild.txt in llvm/lib. 2013-12-10 05:39:34 +00:00
LoadCombine.cpp Add LoadCombine pass. 2014-05-29 01:55:07 +00:00
LoopDeletion.cpp [Modules] Fix potential ODR violations by sinking the DEBUG_TYPE 2014-04-22 02:55:47 +00:00
LoopIdiomRecognize.cpp Tidy up. 2014-04-29 22:41:58 +00:00
LoopInstSimplify.cpp RecursivelyDeleteTriviallyDeadInstructions() could remove 2014-04-26 05:58:11 +00:00
LoopRerollPass.cpp [C++] Use 'nullptr'. Transforms edition. 2014-04-25 05:29:35 +00:00
LoopRotation.cpp Make the LoopRotate pass's maximum header size configurable both programmatically 2014-05-26 08:58:51 +00:00
LoopStrengthReduce.cpp [LSR] Canonicalize reg1 + ... + regN into reg1 + ... + 1*regN. 2014-05-20 19:25:04 +00:00
LoopUnrollPass.cpp Revert r210721 as it causes breakage in internal builds (and possibly GDB). 2014-06-12 18:05:39 +00:00
LoopUnswitch.cpp [C++] Use 'nullptr'. Transforms edition. 2014-04-25 05:29:35 +00:00
LowerAtomic.cpp IR: add "cmpxchg weak" variant to support permitted failure. 2014-06-13 14:24:07 +00:00
Makefile
MemCpyOptimizer.cpp [C++] Use 'nullptr'. Transforms edition. 2014-04-25 05:29:35 +00:00
PartiallyInlineLibCalls.cpp [Modules] Fix potential ODR violations by sinking the DEBUG_TYPE 2014-04-22 02:55:47 +00:00
Reassociate.cpp [Reassociate] Similar to "X + -X" -> "0", added code to handle "X + ~X" -> "-1". 2014-05-31 15:01:54 +00:00
Reg2Mem.cpp [Modules] Fix potential ODR violations by sinking the DEBUG_TYPE 2014-04-22 02:55:47 +00:00
SampleProfile.cpp Remove 'using std::errro_code' from lib. 2014-06-13 02:24:39 +00:00
Scalar.cpp Global merge for global symbols. 2014-06-11 06:44:53 +00:00
Scalarizer.cpp [C++] Use 'nullptr'. Transforms edition. 2014-04-25 05:29:35 +00:00
ScalarReplAggregates.cpp [C++] Use 'nullptr'. Transforms edition. 2014-04-25 05:29:35 +00:00
SCCP.cpp [C++] Use 'nullptr'. 2014-04-28 04:05:08 +00:00
SeparateConstOffsetFromGEP.cpp [SeparateConstOffsetFromGEP] inbounds zext => sext for better splitting 2014-06-08 23:49:34 +00:00
SimplifyCFGPass.cpp Remove 'using std::errro_code' from lib. 2014-06-13 02:24:39 +00:00
Sink.cpp [C++] Use 'nullptr'. Transforms edition. 2014-04-25 05:29:35 +00:00
SROA.cpp [C++] Use 'nullptr'. Transforms edition. 2014-04-25 05:29:35 +00:00
StructurizeCFG.cpp Use range for 2014-05-19 17:52:48 +00:00
TailRecursionElimination.cpp Add support for missed and analysis optimization remarks. 2014-05-22 14:19:46 +00:00