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Serguei Katkov 66182d6c38 [SimplifyCFG] Re-apply Relax restriction for folding unconditional branches 
The commit rL308422 introduces a restriction for folding unconditional
branches. Specifically if empty block with unconditional branch leads to
header of the loop then elimination of this basic block is prohibited.
However it seems this condition is redundantly strict.
If elimination of this basic block does not introduce more back edges
then we can eliminate this block.

The patch implements this relax of restriction.

The test profile/Linux/counter_promo_nest.c in compiler-rt project
is updated to meet this change.

Reviewers: efriedma, mcrosier, pacxx, hsung, davidxl	
Reviewed By: pacxx
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D42691

llvm-svn: 324572
 		2018-02-08 07:16:29 +00:00
..
ADCE [ADCE][Dominators] Reapply: Teach ADCE to preserve dominators 2017-08-22 16:30:21 +00:00
AddDiscriminators Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
AggressiveInstCombine [AggressiveInstCombine] Fixed TruncCombine class to handle TruncInst leaf node correctly. 2018-01-31 22:39:05 +00:00
AlignmentFromAssumptions Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
ArgumentPromotion [Debugify] Handled unsized types 2018-01-06 00:37:01 +00:00
AtomicExpand
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BDCE [BDCE] Don't check demanded bits on unsized types 2017-08-16 16:09:22 +00:00
BlockExtractor [llvm-extract] Support extracting basic blocks 2018-01-23 21:51:34 +00:00
BranchFolding
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CallSiteSplitting [CallSiteSplitting] Fix infinite loop when recording conditions. 2018-01-26 10:36:50 +00:00
CalledValuePropagation Add CalledValuePropagation pass 2017-10-25 13:40:08 +00:00
CodeExtractor [PartialInliner] Update test (NFC). 2018-02-04 18:40:24 +00:00
CodeGenPrepare [AMDGPU] Switch to the new addr space mapping by default 2018-02-02 16:07:16 +00:00
ConstProp [TargetLibraryInfo] fix finite mathlib function availability 2018-01-08 17:38:09 +00:00
ConstantHoisting Fix out-of-order stepping behavior in programs with hoisted constants. 2017-11-09 20:01:31 +00:00
ConstantMerge Canonicalize the representation of empty an expression in DIGlobalVariableExpression 2017-08-30 18:06:51 +00:00
Coroutines [coroutines] Add support for symmetric control transfer (musttail on coro.resumes followed by a suspend) 2017-08-25 02:25:10 +00:00
CorrelatedValuePropagation [CVP] Don't Replace incoming values from unreachable blocks with undef. 2018-01-29 05:59:55 +00:00
CrossDSOCFI [cfi] Build __cfi_check as Thumb when applicable. 2017-08-29 22:29:15 +00:00
DCE Add an @llvm.sideeffect intrinsic 2017-11-08 21:59:51 +00:00
DeadArgElim [DeadArgumentElimination] Preserve llvm.dbg.values's first argument 2018-01-30 16:42:04 +00:00
DeadStoreElimination [DSE] make sure memory is not modified before partial store merging (PR36129) 2018-01-30 13:53:59 +00:00
DivRemPairs [DivRemPairs] split tests per target to account for bots that don't build for all targets 2017-09-09 14:10:59 +00:00
EarlyCSE [EarlyCSE] Salvage debug info during DCE 2018-01-09 15:08:37 +00:00
EliminateAvailableExternally
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EntryExitInstrumenter EntryExitInstrumenter: set DebugLocs on the inserted call instructions (PR35412) 2017-11-28 18:44:26 +00:00
ExpandMemCmp/X86 [x86, MemCmpExpansion] allow 2 pairs of loads per block (PR33325) 2018-01-06 16:16:04 +00:00
Float2Int
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ForcedFunctionAttrs
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FunctionAttrs Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
FunctionImport Make GlobalValues with non-default visibilility dso_local. 2018-01-18 02:08:23 +00:00
GCOVProfiling Canonicalize the representation of empty an expression in DIGlobalVariableExpression 2017-08-30 18:06:51 +00:00
GVN [NFC] fix trivial typos in comments 2018-01-24 05:04:35 +00:00
GVNHoist [GVNHoist] Fix: PR35222 gvn-hoist incorrectly erases load in case of a loop 2018-01-04 07:47:24 +00:00
GVNSink Add an @llvm.sideeffect intrinsic 2017-11-08 21:59:51 +00:00
GlobalDCE
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GlobalMerge Canonicalize the representation of empty an expression in DIGlobalVariableExpression 2017-08-30 18:06:51 +00:00
GlobalOpt Re-commit : [PowerPC] Add handling for ColdCC calling convention and a pass to mark 2018-01-30 16:17:22 +00:00
GlobalSplit
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GuardWidening
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IPConstantProp [IPSCCP] Remove calls without side effects 2018-01-09 21:58:46 +00:00
IRCE Re-enable "[SCEV] Make isLoopEntryGuardedByCond a bit smarter" 2018-02-07 11:16:29 +00:00
IndVarSimplify Re-enable "[SCEV] Make isLoopEntryGuardedByCond a bit smarter" 2018-02-07 11:16:29 +00:00
IndirectBrExpand Introduce the "retpoline" x86 mitigation technique for variant #2 of the speculative execution vulnerabilities disclosed today, specifically identified by CVE-2017-5715, "Branch Target Injection", and is one of the two halves to Spectre.. 2018-01-22 22:05:25 +00:00
InferAddressSpaces [AMDGPU] Switch to the new addr space mapping by default 2018-02-02 16:07:16 +00:00
InferFunctionAttrs
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Inline [NFC] fix trivial typos in comments and documents 2018-01-29 05:17:03 +00:00
InstCombine [InstCombine][ValueTracking] Match non-uniform constant power-of-two vectors 2018-02-06 18:39:23 +00:00
InstMerge
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InstNamer
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InstSimplify [InstSimplify] (X * Y) / Y --> X for relaxed floating-point ops 2018-01-30 00:18:37 +00:00
InterleavedAccess [X86][LLVM]Expanding Supports lowerInterleaved{store|load}() in X86InterleavedAccess (VF64 stride 3-4) 2017-10-02 07:35:25 +00:00
Internalize
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JumpThreading [Dominators] Visit affected node candidates found at different root levels 2018-01-19 21:27:24 +00:00
LCSSA Revert r323472 "[Debug] Add dbg.value intrinsics for PHIs created during LCSSA." 2018-02-05 16:10:42 +00:00
LICM The xfailed test from r324448 passed on one of the bots: remove it entirely for now. 2018-02-07 06:54:11 +00:00
LoadStoreVectorizer [AMDGPU] Switch to the new addr space mapping by default 2018-02-02 16:07:16 +00:00
LoopDataPrefetch
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LoopDeletion [LoopDeletion] Handle users in unreachable block 2018-01-12 07:24:43 +00:00
LoopDistribute
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LoopIdiom Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
LoopInterchange [LoopInterchange] Fix phi node ordering miscompile. 2017-10-21 13:58:37 +00:00
LoopLoadElim
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LoopPredication [Loop Predication] Teach LP about reverse loops 2017-12-04 15:11:48 +00:00
LoopReroll Remove the obsolete offset parameter from @llvm.dbg.value 2017-07-28 20:21:02 +00:00
LoopRotate [LoopRotate] Detect loops with indirect branches better (we're giving up on them). 2018-01-09 23:54:35 +00:00
LoopSimplify [BasicBlockUtils] Check for unreachable preds before updating LI in UpdateAnalysisInformation 2018-01-02 16:25:50 +00:00
LoopSimplifyCFG
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LoopStrengthReduce [LoopStrengthReduce, x86] don't add cost for a cmp that will be macro-fused (PR35681) 2018-02-05 23:43:05 +00:00
LoopUnroll [SimplifyCFG] Re-apply Relax restriction for folding unconditional branches 2018-02-08 07:16:29 +00:00
LoopUnswitch [SimplifyCFG] Re-apply Relax restriction for folding unconditional branches 2018-02-08 07:16:29 +00:00
LoopVectorize Verify profile data confirms large loop trip counts. 2018-02-07 23:29:52 +00:00
LoopVersioning
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LoopVersioningLICM
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LowerAtomic LowerAtomic: Don't skip optnone functions; atomic still need lowering (PR34020) 2017-08-23 15:43:28 +00:00
LowerExpectIntrinsic
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LowerGuardIntrinsic
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LowerInvoke
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LowerSwitch
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LowerTypeTests LowerTypeTests: Add limited support for aliases 2018-01-10 00:00:51 +00:00
Mem2Reg [Debugify] Add a pass to test debug info preservation 2017-12-08 21:57:28 +00:00
MemCpyOpt Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
MergeFunc Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
MergeICmps [MergeICmps] Handle chains with several complex BCE basic blocks. 2018-02-06 12:25:33 +00:00
MetaRenamer Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
NameAnonGlobals
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NaryReassociate
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NewGVN Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
ObjCARC [ObjCARC] Do not turn a call to @objc_autoreleaseReturnValue into a call 2018-01-19 23:51:13 +00:00
PGOProfile [ThinLTO] Remove dead and dropped symbol declarations when possible 2018-02-06 00:43:39 +00:00
PartiallyInlineLibCalls [PartiallyInlineLibCalls][x86] add TTI hook to allow sqrt inlining to depend on arg rather than result 2017-11-27 21:15:43 +00:00
PhaseOrdering [SimplifyCFG] don't sink common insts too soon (PR34603) 2017-12-14 22:05:20 +00:00
PlaceSafepoints Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
PreISelIntrinsicLowering
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PruneEH
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Reassociate Reassociate: add global reassociation algorithm 2017-12-12 19:18:02 +00:00
Reg2Mem
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RewriteStatepointsForGC [RS4GC] Handle call/invoke instructions as base defining values of vectors 2018-01-30 14:43:41 +00:00
SCCP [SCCP] Pick the right lattice value for constants. 2017-11-22 03:04:55 +00:00
SLPVectorizer [SLP] Add a tests for PR36280, NFC. 2018-02-07 20:11:37 +00:00
SROA Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
SafeStack Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
SampleProfile Profiling tests: Endianess XFAIL for powerpc- (32-bit) 2018-01-09 20:09:23 +00:00
Scalarizer Remove the obsolete offset parameter from @llvm.dbg.value 2017-07-28 20:21:02 +00:00
SeparateConstOffsetFromGEP [SeparateConstOffsetFromGEP] Fix up addrspace in the AMDGPU test 2018-01-31 20:49:19 +00:00
SimpleLoopUnswitch [PM/Unswitch] Teach SimpleLoopUnswitch to do non-trivial unswitching, 2017-11-17 19:58:36 +00:00
SimplifyCFG [SimplifyCFG] Re-apply Relax restriction for folding unconditional branches 2018-02-08 07:16:29 +00:00
Sink [Sink] Really really fix predicate in legality check 2018-01-11 21:28:57 +00:00
SpeculateAroundPHIs Add a new pass to speculate around PHI nodes with constant (integer) operands when profitable. 2017-11-28 11:32:31 +00:00
SpeculativeExecution
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StraightLineStrengthReduce
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StripDeadPrototypes
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StripSymbols Canonicalize the representation of empty an expression in DIGlobalVariableExpression 2017-08-30 18:06:51 +00:00
StructurizeCFG Revert r321751, "StructurizeCFG: Fix broken backedge detection" 2018-01-24 18:02:05 +00:00
SyntheticCountsPropagation Add a pass to generate synthetic function entry counts. 2018-01-09 19:39:35 +00:00
TailCallElim Remove this test 2017-11-28 22:39:38 +00:00
ThinLTOBitcodeWriter [ThinLTO] fix test failure without x86 backend 2018-02-06 07:03:09 +00:00
Util Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
WholeProgramDevirt Make GlobalValues with non-default visibilility dso_local. 2018-01-18 02:08:23 +00:00