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a0999051a2
llvm-mirror/test/Transforms
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Silviu Baranga a0999051a2 Re-commit [SCEV] Introduce a guarded backedge taken count and use it in LAA and LV 
This re-commits r265535 which was reverted in r265541 because it
broke the windows bots. The problem was that we had a PointerIntPair
which took a pointer to a struct allocated with new. The problem
was that new doesn't provide sufficient alignment guarantees.
This pattern was already present before r265535 and it just happened
to work. To fix this, we now separate the PointerToIntPair from the
ExitNotTakenInfo struct into a pointer and a bool.

Original commit message:

Summary:
When the backedge taken codition is computed from an icmp, SCEV can
deduce the backedge taken count only if one of the sides of the icmp
is an AddRecExpr. However, due to sign/zero extensions, we sometimes
end up with something that is not an AddRecExpr.

However, we can use SCEV predicates to produce a 'guarded' expression.
This change adds a method to SCEV to get this expression, and the
SCEV predicate associated with it.

In HowManyGreaterThans and HowManyLessThans we will now add a SCEV
predicate associated with the guarded backedge taken count when the
analyzed SCEV expression is not an AddRecExpr. Note that we only do
this as an alternative to returning a 'CouldNotCompute'.

We use new feature in Loop Access Analysis and LoopVectorize to analyze
and transform more loops.

Reviewers: anemet, mzolotukhin, hfinkel, sanjoy

Subscribers: flyingforyou, mcrosier, atrick, mssimpso, sanjoy, mzolotukhin, llvm-commits

Differential Revision: http://reviews.llvm.org/D17201

llvm-svn: 265786
2016-04-08 14:29:09 +00:00
..
ADCE testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
AddDiscriminators testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
AlignmentFromAssumptions
ArgumentPromotion testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
AtomicExpand ARM: sink atomic release barrier as far as possible into cmpxchg. 2016-02-22 20:55:50 +00:00
BBVectorize
BDCE
BranchFolding
CodeExtractor
CodeGenPrepare [CodeGenPrepare] Avoid sinking soft-FP comparisons 2016-04-03 16:36:17 +00:00
ConstantHoisting
ConstantMerge
ConstProp
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 testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
DeadStoreElimination testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
EarlyCSE
EliminateAvailableExternally
Float2Int
ForcedFunctionAttrs
FunctionAttrs Don't IPO over functions that can be de-refined 2016-04-08 00:48:30 +00:00
FunctionImport Fix bot errors from r265327, exact GUID which depends on path 2016-04-04 19:11:00 +00:00
GCOVProfiling testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
GlobalDCE
GlobalOpt testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
GVN [GVN] Fix handling of sub-byte types in big-endian mode 2016-04-07 15:45:02 +00:00
IndVarSimplify [IndVarSimplify] Don't insert after a catchswitch 2016-03-30 21:12:06 +00:00
InferFunctionAttrs [NVPTX] Infer __nvvm_reflect as nounwind, readnone 2016-03-31 21:29:57 +00:00
Inline Reapply "ValueMapper: Treat LocalAsMetadata more like function-local Values" 2016-04-08 03:13:22 +00:00
InstCombine regenerate checks 2016-04-06 19:58:06 +00:00
InstMerge fixed typo - CHECK-LABEL 2016-03-29 06:49:38 +00:00
InstSimplify [InstSimplify] regenerate checks using a script 2016-03-25 20:12:25 +00:00
Internalize
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
JumpThreading [JumpThreading] See through Cast Instructions 2016-03-16 04:52:52 +00:00
LCSSA
LICM Mark some FP intrinsics as safe to speculatively execute 2016-04-03 12:30:46 +00:00
LoadCombine
LoopDataPrefetch [LoopDataPrefetch] Centralize the tuning cl::opts under the pass 2016-03-29 23:45:52 +00:00
LoopDeletion
LoopDistribute
LoopIdiom testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
LoopInterchange
LoopLoadElim [LLE] Check for mismatching types between the store and the load earlier 2016-03-24 17:59:26 +00:00
LoopReroll testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
LoopRotate testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
LoopSimplify [DebugInfo] Fix tests so that each subprogram belongs to a CU. 2016-04-05 23:37:08 +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 [LoopUnroll] Fix the way we update DT after complete unrolling. 2016-04-06 21:47:12 +00:00
LoopUnswitch [SimlifyCFG] Prevent passes from destroying canonical loop structure, especially for nested loops 2016-03-29 04:08:57 +00:00
LoopVectorize Re-commit [SCEV] Introduce a guarded backedge taken count and use it in LAA and LV 2016-04-08 14:29:09 +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
LowerBitSets
LowerExpectIntrinsic
LowerGuardIntrinsic Introduce a @llvm.experimental.guard intrinsic 2016-03-31 00:18:46 +00:00
LowerInvoke
LowerSwitch
Mem2Reg testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
MemCpyOpt Imporove load to store => memcpy 2016-03-14 22:52:27 +00:00
MergeFunc
MetaRenamer
NaryReassociate
ObjCARC Don't IPO over functions that can be de-refined 2016-04-08 00:48:30 +00:00
PartiallyInlineLibCalls
PGOProfile [PGO] Avoid instrumenting direct callee's at value sites. 2016-04-04 18:56:36 +00:00
PhaseOrdering
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
RewriteStatepointsForGC [RS4GC] Better codegen for deoptimize calls 2016-04-05 23:18:35 +00:00
SafeStack testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
SampleProfile testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
Scalarizer testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
ScalarRepl testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
SCCP Don't IPO over functions that can be de-refined 2016-04-08 00:48:30 +00:00
SeparateConstOffsetFromGEP [ValueTracking] Remove dead code from an old experiment 2016-03-03 19:44:06 +00:00
SimplifyCFG testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
Sink
SLPVectorizer [SLPVectorizer] Vectorizing the libm sqrt to llvm's sqrt intrinsic requires nnan 2016-04-06 07:04:53 +00:00
SpeculativeExecution
SROA Have DataLayout::isLegalInteger() accept uint64_t 2016-03-18 23:19:29 +00:00
StraightLineStrengthReduce
StripDeadPrototypes
StripSymbols testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
StructurizeCFG AMDGPU: Remove some old intrinsic uses from tests 2016-02-11 06:02:01 +00:00
TailCallElim
Util testcase gardening: update the emissionKind enum to the new syntax. (NFC) 2016-04-01 00:16:49 +00:00
WholeProgramDevirt WholeProgramDevirt: introduce. 2016-02-09 22:50:34 +00:00