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
..
2002-03-08-NameCollision2.ll
2002-03-08-NameCollision.ll
2002-04-07-HexFloatConstants.ll
2002-04-07-InfConstant.ll
2002-04-29-NameBinding.ll
2002-05-02-InvalidForwardRef.ll
2002-07-14-OpaqueType.ll
2002-07-25-QuoteInString.ll
2002-07-25-ReturnPtrFunction.ll
2002-07-31-SlashInString.ll
2002-08-15-CastAmbiguity.ll
2002-08-15-ConstantExprProblem.ll
2002-08-15-UnresolvedGlobalReference.ll
2002-08-16-ConstExprInlined.ll
2002-08-19-BytecodeReader.ll
2002-08-22-DominanceProblem.ll
2002-10-08-LargeArrayPerformance.ll
2002-10-13-ConstantEncodingProblem.ll
2002-12-15-GlobalResolve.ll
2003-01-30-UnsignedString.ll
2003-04-15-ConstantInitAssertion.ll
2003-04-25-UnresolvedGlobalReference.ll
2003-05-03-BytecodeReaderProblem.ll
2003-05-12-MinIntProblem.ll
2003-05-15-AssemblerProblem.ll
2003-05-15-SwitchBug.ll
2003-05-21-ConstantShiftExpr.ll
2003-05-21-EmptyStructTest.ll
2003-05-21-MalformedShiftCrash.ll
2003-05-21-MalformedStructCrash.ll
2003-08-20-ConstantExprGEP-Fold.ll
2003-08-21-ConstantExprCast-Fold.ll
2003-11-05-ConstantExprShift.ll
2003-11-11-ImplicitRename.ll
2003-11-12-ConstantExprCast.ll
2003-11-24-SymbolTableCrash.ll
2004-01-11-getelementptrfolding.ll
2004-01-20-MaxLongLong.ll
2004-02-01-NegativeZero.ll
2004-02-27-SelfUseAssertError.ll
2004-03-07-FunctionAddressAlignment.ll
2004-03-30-UnclosedFunctionCrash.ll
2004-04-04-GetElementPtrIndexTypes.ll
2004-06-07-VerifierBug.ll
2004-10-22-BCWriterUndefBug.ll
2004-11-28-InvalidTypeCrash.ll
2005-01-03-FPConstantDisassembly.ll
2005-01-31-CallingAggregateFunction.ll
2005-05-05-OpaqueUndefValues.ll
2005-12-21-ZeroInitVector.ll
2006-09-28-CrashOnInvalid.ll
2006-12-09-Cast-To-Bool.ll
2007-01-02-Undefined-Arg-Type.ll
2007-01-05-Cmp-ConstExpr.ll
2007-01-16-CrashOnBadCast2.ll
2007-01-16-CrashOnBadCast.ll
2007-03-18-InvalidNumberedVar.ll
2007-03-19-NegValue.ll
2007-04-20-AlignedLoad.ll
2007-04-20-AlignedStore.ll
2007-04-25-AssemblerFoldExternWeak.ll
2007-05-21-Escape.ll
2007-07-19-ParamAttrAmbiguity.ll
2007-08-06-AliasInvalid.ll
2007-09-10-AliasFwdRef.ll	Reject alias to undefined symbols in the verifier.	2014-03-12 20:15:49 +00:00
2007-09-29-GC.ll
2007-11-26-AttributeOverload.ll
2007-12-11-AddressSpaces.ll
2008-01-11-VarargAttrs.ll
2008-02-18-IntPointerCrash.ll
2008-07-10-APInt.ll
2008-09-02-FunctionNotes2.ll
2008-09-02-FunctionNotes.ll
2008-09-29-RetAttr.ll
2008-10-14-QuoteInName.ll
2009-02-01-UnnamedForwardRef.ll
2009-02-28-CastOpc.ll
2009-02-28-StripOpaqueName.ll
2009-03-24-ZextConstantExpr.ll
2009-07-24-ZeroArgGEP.ll
2010-02-05-FunctionLocalMetadataBecomesNull.ll	Debug Info Testing: updated to use NULL instead of "i32 0" in a few fields.	2013-09-06 21:03:58 +00:00
addrspacecast-alias.ll	Allow alias to point to an arbitrary ConstantExpr.	2014-06-03 02:41:57 +00:00
aggregate-constant-values.ll
aggregate-return-single-value.ll
alias-redefinition.ll	Don't crash on redefinitions.	2014-05-09 21:49:17 +00:00
align-inst-alloca.ll
align-inst-load.ll
align-inst-store.ll
align-inst.ll
alignstack.ll
anon-functions.ll
atomic.ll	IR: add "cmpxchg weak" variant to support permitted failure.	2014-06-13 14:24:07 +00:00
attribute-builtin.ll	Remove verifier check that attribute 'builtin' is only applied to calls to	2013-09-07 00:25:48 +00:00
auto_upgrade_intrinsics.ll	Change objectsize intrinsic to accept different address spaces.	2013-10-07 18:06:48 +00:00
bcwrap.ll
comment.ll
ConstantExprFold.ll
ConstantExprFoldCast.ll	Add addrspacecast instruction.	2013-11-15 01:34:59 +00:00
ConstantExprFoldSelect.ll	Fold vector selects with undef elements in the condition. Fixes PR18319.	2013-12-31 19:30:47 +00:00
ConstantExprNoFold.ll	Add addrspacecast instruction.	2013-11-15 01:34:59 +00:00
externally-initialized.ll
extractvalue-invalid-idx.ll
fast-math-flags.ll
flags.ll
functionlocal-metadata.ll	Fix broken CHECK lines.	2014-01-11 21:06:00 +00:00
getelementptr_struct.ll
getelementptr_vec_idx1.ll
getelementptr_vec_idx2.ll
getelementptr_vec_idx3.ll
getelementptr_vec_struct.ll
getelementptr.ll
getInt.ll	Clean up RUN command for Assembler/getInt.ll.	2014-01-13 22:37:35 +00:00
global-addrspace-forwardref.ll
half-constprop.ll	No need for those tests to go thru llvm-as and/or llvm-dis.	2014-05-27 22:03:28 +00:00
half-conv.ll	No need for those tests to go thru llvm-as and/or llvm-dis.	2014-05-27 22:03:28 +00:00
half.ll
huge-array.ll
inalloca.ll	IR: Change inalloca's grammar a bit	2014-03-09 06:41:58 +00:00
insertextractvalue.ll
insertvalue-invalid-idx.ll
internal-hidden-alias.ll	IR: Don't allow non-default visibility on local linkage	2014-05-07 22:57:20 +00:00
internal-hidden-function.ll	IR: Don't allow non-default visibility on local linkage	2014-05-07 22:57:20 +00:00
internal-hidden-variable.ll	IR: Don't allow non-default visibility on local linkage	2014-05-07 22:57:20 +00:00
internal-protected-alias.ll	IR: Don't allow non-default visibility on local linkage	2014-05-07 22:57:20 +00:00
internal-protected-function.ll	IR: Don't allow non-default visibility on local linkage	2014-05-07 22:57:20 +00:00
internal-protected-variable.ll	IR: Don't allow non-default visibility on local linkage	2014-05-07 22:57:20 +00:00
invalid_cast2.ll
invalid_cast3.ll	Bug 18228 - Fix accepting bitcasts between vectors of pointers with a	2014-01-22 19:21:33 +00:00
invalid_cast.ll
invalid-fwdref1.ll
invalid-name.ll	Make it explicit that nulls are not allowed in names.	2013-11-19 21:12:39 +00:00
metadata.ll
MultipleReturnValueType.ll
named-metadata.ll
numbered-values.ll
private-hidden-alias.ll	IR: Don't allow non-default visibility on local linkage	2014-05-07 22:57:20 +00:00
private-hidden-function.ll	IR: Don't allow non-default visibility on local linkage	2014-05-07 22:57:20 +00:00
private-hidden-variable.ll	IR: Don't allow non-default visibility on local linkage	2014-05-07 22:57:20 +00:00
private-protected-alias.ll	IR: Don't allow non-default visibility on local linkage	2014-05-07 22:57:20 +00:00
private-protected-function.ll	IR: Don't allow non-default visibility on local linkage	2014-05-07 22:57:20 +00:00
private-protected-variable.ll	IR: Don't allow non-default visibility on local linkage	2014-05-07 22:57:20 +00:00
select.ll
tls-models.ll
unnamed-addr.ll
unnamed.ll
vbool-cmp.ll
vector-cmp.ll
vector-select.ll
vector-shift.ll
x86mmx.ll