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Jatin Bhateja 3c29bacd43 [X86] Improvement in CodeGen instruction selection for LEAs (re-applying post required revision changes.) 
Summary:
   1/  Operand folding during complex pattern matching for LEAs has been
       extended, such that it promotes Scale to accommodate similar operand
       appearing in the DAG.
       e.g.
         T1 = A + B
         T2 = T1 + 10
         T3 = T2 + A
       For above DAG rooted at T3, X86AddressMode will no look like
         Base = B , Index = A , Scale = 2 , Disp = 10

   2/  During OptimizeLEAPass down the pipeline factorization is now performed over LEAs
       so that if there is an opportunity then complex LEAs (having 3 operands)
       could be factored out.
       e.g.
         leal 1(%rax,%rcx,1), %rdx
         leal 1(%rax,%rcx,2), %rcx
       will be factored as following
         leal 1(%rax,%rcx,1), %rdx
         leal (%rdx,%rcx)   , %edx

   3/ Aggressive operand folding for AM based selection for LEAs is sensitive to loops,
      thus avoiding creation of any complex LEAs within a loop.

Reviewers: lsaba, RKSimon, craig.topper, qcolombet, jmolloy

Reviewed By: lsaba

Subscribers: jmolloy, spatel, igorb, llvm-commits

    Differential Revision: https://reviews.llvm.org/D35014

llvm-svn: 314886
 		2017-10-04 09:02:10 +00:00
..
ADCE [ADCE][Dominators] Reapply: Teach ADCE to preserve dominators 2017-08-22 16:30:21 +00:00
AddDiscriminators
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AlignmentFromAssumptions
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ArgumentPromotion [ArgPromotion] Preserve alignment of byval argument in new alloca 2017-08-04 17:09:11 +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
BranchFolding
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CodeExtractor Clean up a test case 2017-06-27 21:35:49 +00:00
CodeGenPrepare [CGP] In optimizeMemoryInst handle select similarly to phi 2017-10-03 13:04:15 +00:00
ConstProp [X86] Replace 'REQUIRES: x86' in tests with 'REQUIRES: x86-registered-target' which seems to be the correct way to make them run on an x86 build. 2017-06-04 08:21:58 +00:00
ConstantHoisting [ConstantHoisting] Remove dupliate logic in constant hoisting 2017-07-10 20:45:34 +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 [LVI] Constant-propagate a zero extension of the switch condition value through case edges 2017-08-03 21:11:30 +00:00
CountingFunctionInserter
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CrossDSOCFI [cfi] Build __cfi_check as Thumb when applicable. 2017-08-29 22:29:15 +00:00
DCE Add strictfp attribute to prevent unwanted optimizations of libm calls 2017-08-14 21:15:13 +00:00
DeadArgElim Remove the obsolete offset parameter from @llvm.dbg.value 2017-07-28 20:21:02 +00:00
DeadStoreElimination [DSE] Merge stores when the later store only writes to memory locations the early store also wrote to (2nd try) 2017-09-26 13:54:28 +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] Handle calls with no MemorySSA info. 2017-07-14 20:13:21 +00:00
EliminateAvailableExternally
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Float2Int
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ForcedFunctionAttrs
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FunctionAttrs Merge isKnownNonNull into isKnownNonZero 2017-09-09 18:23:11 +00:00
FunctionImport Fix bot failures by requiring x86 target 2017-08-19 19:15:04 +00:00
GCOVProfiling Canonicalize the representation of empty an expression in DIGlobalVariableExpression 2017-08-30 18:06:51 +00:00
GVN This patch fixes https://bugs.llvm.org/show_bug.cgi?id=32352 2017-09-15 20:10:09 +00:00
GVNHoist [GVNHoist] Factor out reachability to search for anticipable instructions quickly 2017-09-13 05:28:03 +00:00
GVNSink Changed a comparison operator for std::stable_sort to implement strict weak ordering. 2017-06-08 17:27:40 +00:00
GlobalDCE [PM] Teach the PGO instrumentation pasess to run GlobalDCE before 2017-05-25 07:15:09 +00:00
GlobalMerge Canonicalize the representation of empty an expression in DIGlobalVariableExpression 2017-08-30 18:06:51 +00:00
GlobalOpt Fixed reverted commit rL312318 2017-09-21 10:04:02 +00:00
GlobalSplit
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GuardWidening
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IPConstantProp
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IRCE [IRCE] Temporarily disable unsigned latch conditions by default 2017-10-04 06:53:22 +00:00
IndVarSimplify [SimplifyIndVar] Do not fail when we constant fold an IV user to ConstantPointerNull 2017-09-29 16:32:12 +00:00
InferAddressSpaces [InferAddressSpaces] Fix assertion about null pointer 2017-07-07 02:40:13 +00:00
InferFunctionAttrs Add argmononly attribute to strlen and wcslen, i.e. they only read memory (string) passed to them. 2017-06-18 03:10:26 +00:00
Inline Move verbosity check for remarks to the diag handler 2017-10-04 04:26:23 +00:00
InstCombine [InstCombine] add tests for icmp gt/lt (shr X, C1), C2; NFC 2017-10-03 20:34:20 +00:00
InstMerge
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InstNamer
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InstSimplify [InstSimplify] teach SimplifySelectInst() to fold more vector selects 2017-10-02 23:43:52 +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 Disable jump threading into loop headers 2017-09-06 19:36:58 +00:00
LCSSA
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LICM Remove the obsolete offset parameter from @llvm.dbg.value 2017-07-28 20:21:02 +00:00
LoadStoreVectorizer
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LoopDataPrefetch
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LoopDeletion [Dominators] Teach LoopDeletion to use the new incremental API 2017-08-02 18:17:52 +00:00
LoopDistribute
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LoopIdiom Remove the obsolete offset parameter from @llvm.dbg.value 2017-07-28 20:21:02 +00:00
LoopInterchange [LoopInterchange] Skip zext instructions when looking for induction var. 2017-08-25 16:52:29 +00:00
LoopLoadElim
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LoopPredication Rework loop predication pass 2017-09-22 13:13:57 +00:00
LoopReroll Remove the obsolete offset parameter from @llvm.dbg.value 2017-07-28 20:21:02 +00:00
LoopRotate Parse and print DIExpressions inline to ease IR and MIR testing 2017-08-23 20:31:27 +00:00
LoopSimplify Remove the obsolete offset parameter from @llvm.dbg.value 2017-07-28 20:21:02 +00:00
LoopSimplifyCFG
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LoopStrengthReduce [X86] Improvement in CodeGen instruction selection for LEAs (re-applying post required revision changes.) 2017-10-04 09:02:10 +00:00
LoopUnroll Use a BumpPtrAllocator for Loop objects 2017-09-28 02:45:42 +00:00
LoopUnswitch [LoopUnswitch] Fix a simple bug which disables loop unswitch for select statement 2017-08-29 21:45:11 +00:00
LoopVectorize [LV] Use correct insertion point when type shrinking reductions 2017-09-29 18:07:39 +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 Fix builin_expect lowering bug 2017-06-07 18:32:24 +00:00
LowerGuardIntrinsic
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LowerInvoke
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LowerSwitch
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LowerTypeTests LowerTypeTests: Add import/export support for targets without absolute symbol constants. 2017-09-11 22:49:10 +00:00
Mem2Reg Re-land r313825: "[IR] Add llvm.dbg.addr, a control-dependent version of llvm.dbg.declare" 2017-09-21 19:52:03 +00:00
MemCpyOpt
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MergeFunc Parse and print DIExpressions inline to ease IR and MIR testing 2017-08-23 20:31:27 +00:00
MergeICmps Reland rL312315: [MergeICmps] MergeICmps is a new optimization pass that turns chains of integer 2017-09-01 10:56:34 +00:00
MetaRenamer [MetaRenamer] Leave `@main` alone. 2017-08-01 05:14:45 +00:00
NameAnonGlobals
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NaryReassociate
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NewGVN NewGVN: Fix PR 34473, by not using ExactlyEqualsExpression for finding 2017-09-30 23:51:55 +00:00
ObjCARC [ObjCARC] Pass the correct BasicBlock to fix assertion failure. 2017-08-31 18:27:47 +00:00
PGOProfile [ThinLTO] Fix dead stripping analysis for SamplePGO 2017-09-20 17:09:47 +00:00
PartiallyInlineLibCalls
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PhaseOrdering
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PlaceSafepoints All libcalls should be considered to be GC-leaf functions. 2017-07-27 16:49:39 +00:00
PreISelIntrinsicLowering
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PruneEH
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Reassociate [Reassociate] Do not drop debug location if replacement is missing 2017-08-24 09:05:00 +00:00
Reg2Mem
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RewriteStatepointsForGC All libcalls should be considered to be GC-leaf functions. 2017-07-27 16:49:39 +00:00
SCCP [IPSCCP] Guard a user of getInitializer with hasDefinitiveInitializer 2017-07-31 17:47:07 +00:00
SLPVectorizer Revert r314806 "[SLP] Vectorize jumbled memory loads." 2017-10-03 18:32:29 +00:00
SROA Re-land r313825: "[IR] Add llvm.dbg.addr, a control-dependent version of llvm.dbg.declare" 2017-09-21 19:52:03 +00:00
SafeStack Parse and print DIExpressions inline to ease IR and MIR testing 2017-08-23 20:31:27 +00:00
SampleProfile Separate the logic when handling indirect calls in SamplePGO ThinLTO compile phase and other phases. 2017-10-01 05:24:51 +00:00
Scalarizer Remove the obsolete offset parameter from @llvm.dbg.value 2017-07-28 20:21:02 +00:00
SeparateConstOffsetFromGEP
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SimpleLoopUnswitch [PM/Unswitch] Fix a bug in the domtree update logic for the new unswitch 2017-05-25 06:33:36 +00:00
SimplifyCFG Update getMergedLocation to check the instruction type and merge properly. 2017-10-02 18:13:14 +00:00
Sink Enhance synchscope representation 2017-07-11 22:23:00 +00:00
SpeculativeExecution Revert r301950: SpeculativeExecution: Stop using whitelist for costs 2017-05-10 12:30:07 +00:00
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 [Dominators] Include infinite loops in PostDominatorTree 2017-08-15 18:14:57 +00:00
TailCallElim [TRE] Add another test for OptRemark. 2017-07-19 21:39:51 +00:00
ThinLTOBitcodeWriter ThinLTO Minimized Bitcode File Size Reduction 2017-07-21 17:25:20 +00:00
Util [InstCombine] Add a flag to disable LowerDbgDeclare 2017-09-13 01:43:25 +00:00
WholeProgramDevirt LowerTypeTests: Add import/export support for targets without absolute symbol constants. 2017-09-11 22:49:10 +00:00