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Tim Northover b629c77692 ARM: use a pseudo-instruction for cmpxchg at -O0. 
The fast register-allocator cannot cope with inter-block dependencies without
spilling. This is fine for ldrex/strex loops coming from atomicrmw instructions
where any value produced within a block is dead by the end, but not for
cmpxchg. So we lower a cmpxchg at -O0 via a pseudo-inst that gets expanded
after regalloc.

Fortunately this is at -O0 so we don't have to care about performance. This
simplifies the various axes of expansion considerably: we assume a strong
seq_cst operation and ensure ordering via the always-present DMB instructions
rather than v8 acquire/release instructions.

Should fix the 32-bit part of PR25526.

llvm-svn: 266679
 		2016-04-18 21:48:55 +00:00
..
ADCE [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
AddDiscriminators [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
AlignmentFromAssumptions Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
ArgumentPromotion [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
AtomicExpand ARM: use a pseudo-instruction for cmpxchg at -O0. 2016-04-18 21:48:55 +00:00
BBVectorize Have a single way for creating unique value names. 2015-11-22 00:16:24 +00:00
BDCE
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BranchFolding Move branch folding test to a better location. 2015-12-03 19:41:25 +00:00
CodeExtractor
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CodeGenPrepare [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
ConstProp IR: Make ConstantDataArray::getFP actually return a ConstantDataArray 2015-12-09 21:21:07 +00:00
ConstantHoisting ARM: don't try to hoist constant RHS out of a division. 2016-04-15 18:17:18 +00:00
ConstantMerge
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CorrelatedValuePropagation [CVP] Convert an SDiv to a UDiv if both operands are known to be nonnegative 2016-03-14 03:24:28 +00:00
CrossDSOCFI [cfi] Cross-DSO CFI diagnostic mode (LLVM part). 2016-01-25 23:35:03 +00:00
DeadArgElim [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
DeadStoreElimination [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
EarlyCSE Fix several accidental DOS line endings in source files 2016-01-03 17:22:03 +00:00
EliminateAvailableExternally
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Float2Int [Float2Int] Don't operate on vector instructions 2015-12-09 21:08:18 +00:00
ForcedFunctionAttrs [attrs] Split off the forced attributes utility into its own pass that 2015-12-27 08:13:45 +00:00
FunctionAttrs Don't IPO over functions that can be de-refined 2016-04-08 00:48:30 +00:00
FunctionImport ThinLTO: Make aliases explicit in the summary 2016-04-16 06:56:44 +00:00
GCOVProfiling [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
GVN [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
GlobalDCE
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GlobalOpt [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
IPConstantProp Don't IPO over functions that can be de-refined 2016-04-08 00:48:30 +00:00
IRCE [SCEV] Try to reuse existing value during SCEV expansion 2016-02-04 01:27:38 +00:00
IndVarSimplify This reverts commit r265913 and r265912 2016-04-11 15:26:18 +00:00
InferFunctionAttrs [NVPTX] Infer __nvvm_reflect as nounwind, readnone 2016-03-31 21:29:57 +00:00
Inline Revert "Replace the use of MaxFunctionCount module flag" 2016-04-18 15:31:11 +00:00
InstCombine Fix a typo in rL265762 2016-04-17 04:30:43 +00:00
InstMerge fixed typo - CHECK-LABEL 2016-03-29 06:49:38 +00:00
InstSimplify [ValueTracking] Correct lit test comments. NFC. 2016-04-18 19:11:45 +00:00
Internalize
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JumpThreading [JumpThreading] See through Cast Instructions 2016-03-16 04:52:52 +00:00
LCSSA [WinEH] Update LCSSA to handle catchswitch with handlers inside and outside a loop 2015-12-18 18:12:35 +00:00
LICM [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
LoadCombine
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LoopDataPrefetch [LoopDataPrefetch] Centralize the tuning cl::opts under the pass 2016-03-29 23:45:52 +00:00
LoopDeletion
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LoopDistribute Allow LLE/LD and the loop versioning infrastructure to use SCEV predicates 2015-11-09 13:26:09 +00:00
LoopIdiom [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
LoopInterchange
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LoopLoadElim [LLE] Check for mismatching types between the store and the load earlier 2016-03-24 17:59:26 +00:00
LoopReroll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
LoopRotate [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
LoopSimplify [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
LoopSimplifyCFG Add LoopSimplifyCFG pass 2016-01-29 22:35:36 +00:00
LoopStrengthReduce Don't delete empty preheaders in CodeGenPrepare if it would create a critical edge 2016-04-05 14:06:20 +00:00
LoopUnroll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
LoopUnswitch [SimlifyCFG] Prevent passes from destroying canonical loop structure, especially for nested loops 2016-03-29 04:08:57 +00:00
LoopVectorize [ARM] AArch32 v8 NEON is still not IEEE-754 compliant 2016-04-18 12:06:47 +00:00
LoopVersioning [LVers] Change CHECK_LABEL to CHECK-LABEL (underscore->dash) 2016-03-28 21:04:13 +00:00
LoopVersioningLICM Corrected tests for Loop Versioning LICM, by adding “REQUIRES: asserts”. 2016-02-06 12:34:41 +00:00
LowerAtomic
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LowerBitSets [cfi] Support explicit sections for functions in cfi-icall. 2016-04-15 22:55:38 +00:00
LowerExpectIntrinsic [PM] Port StripDeadPrototypes to the new pass manager 2015-10-30 23:28:12 +00:00
LowerGuardIntrinsic Introduce a @llvm.experimental.guard intrinsic 2016-03-31 00:18:46 +00:00
LowerInvoke
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LowerSwitch Have a single way for creating unique value names. 2015-11-22 00:16:24 +00:00
Mem2Reg [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
MemCpyOpt Imporove load to store => memcpy 2016-03-14 22:52:27 +00:00
MergeFunc MergeFunctions: test alloca better 2016-04-12 00:03:26 +00:00
MetaRenamer Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
NameAnonFunctions Add a pass to name anonymous/nameless function 2016-04-12 21:35:28 +00:00
NaryReassociate [NaryReassociate] allow candidate to have a different type 2015-12-18 21:36:30 +00:00
ObjCARC [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
PGOProfile [PGO] Avoid instrumenting direct callee's at value sites. 2016-04-04 18:56:36 +00:00
PartiallyInlineLibCalls
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PhaseOrdering
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PlaceSafepoints [PlaceSafepoints] Clamp NoStatepoints to true 2016-01-28 21:51:14 +00:00
PruneEH [PruneEH] Don't try to insert a terminator after another terminator 2016-01-23 06:00:44 +00:00
Reassociate Reassociate: Reprocess RedoInsts after each inst 2016-01-26 18:42:36 +00:00
Reg2Mem
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RewriteStatepointsForGC [RS4GC] Better codegen for deoptimize calls 2016-04-05 23:18:35 +00:00
SCCP Don't IPO over functions that can be de-refined 2016-04-08 00:48:30 +00:00
SLPVectorizer [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
SROA [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
SafeStack [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
SampleProfile [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
ScalarRepl [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
Scalarizer [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
SeparateConstOffsetFromGEP [ValueTracking] Remove dead code from an old experiment 2016-03-03 19:44:06 +00:00
SimplifyCFG [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
Sink [IR] Reformulate LLVM's EH funclet IR 2015-12-12 05:38:55 +00:00
SpeculativeExecution Move divergent-target test into CodeGen/NVPTX because it requires an NVPTX target. 2016-04-15 01:20:52 +00:00
StraightLineStrengthReduce
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StripDeadPrototypes [PM] Port StripDeadPrototypes to the new pass manager 2015-10-30 23:28:12 +00:00
StripSymbols [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
StructurizeCFG AMDGPU: Remove leftover ShaderType attributes in tests 2016-04-13 00:39:48 +00:00
TailCallElim Push isDereferenceableAndAlignedPointer down into isSafeToLoadUnconditionally 2016-01-17 12:35:29 +00:00
Util [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
WholeProgramDevirt WholeProgramDevirt: introduce. 2016-02-09 22:50:34 +00:00