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Reid Kleckner 8a1cd91016 [InstCombine] Add a flag to disable LowerDbgDeclare 
Summary:
This should improve optimized debug info for address-taken variables at
the cost of inaccurate debug info in some situations.

We patched this into clang and deployed this change to Chromium
developers, and this significantly improved debuggability of optimized
code. The long-term solution to PR34136 seems more and more like it's
going to take a while, so I would like to commit this change under a
flag so that it can be used as a stop-gap measure.

This flag should really help so for C++ aggregates like std::string and
std::vector, which are typically address-taken, even after inlining, and
cannot be SROA-ed.

Reviewers: aprantl, dblaikie, probinson, dberlin

Subscribers: hiraditya, llvm-commits

Differential Revision: https://reviews.llvm.org/D36596

llvm-svn: 313108
 		2017-09-13 01:43:25 +00:00
..
ADCE [ADCE][Dominators] Reapply: Teach ADCE to preserve dominators 2017-08-22 16:30:21 +00:00
AddDiscriminators [AddDiscriminators] Assign discriminators to MemIntrinsic calls. 2017-04-11 19:07:30 +00:00
AlignmentFromAssumptions
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ArgumentPromotion [ArgPromotion] Preserve alignment of byval argument in new alloca 2017-08-04 17:09:11 +00:00
AtomicExpand Add address space mangling to lifetime intrinsics 2017-04-10 20:18:21 +00:00
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 Unmerge GEPs to reduce register pressure on IndirectBr edges. 2017-09-11 17:52:08 +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 Revert r310055, it caused PR34074. 2017-08-04 20:40:38 +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 Split opt-remark YAML and opt output testing on this test 2017-09-05 18:03:39 +00:00
GVNHoist Disable GVN Hoist due to still more bugs being found in it. There is 2017-04-27 00:28:03 +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 Revert r312318, r312325, r312424, r312489 2017-09-07 23:20:35 +00:00
GlobalSplit
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GuardWidening
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IPConstantProp
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IRCE Re-enable "[IRCE] Identify loops with latch comparison against current IV value" 2017-09-08 10:15:05 +00:00
IndVarSimplify [SCEV/IndVars] Always compute loop exiting values if the backedge count is 0 2017-08-01 22:37:58 +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 Add llvm.codeview.annotation to implement MSVC __annotation 2017-09-05 20:14:58 +00:00
InstCombine [InstCombine] Add a flag to disable LowerDbgDeclare 2017-09-13 01:43:25 +00:00
InstMerge
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InstNamer Add basic test case for -instnamer 2017-05-08 23:18:46 +00:00
InstSimplify [InstSimplify] fix some test names; NFC 2017-09-11 20:38:31 +00:00
InterleavedAccess [Interleved][Stride 3]Adding test for case the VF=64 target with AVX512. 2017-09-11 10:57:15 +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 Skip bitcasts while looking for GEP in LoadStoreVectorizer 2017-04-25 18:00:08 +00:00
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
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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 [LSR] Fix Shadow IV in case of integer overflow 2017-08-29 07:32:20 +00:00
LoopUnroll [LoopUnroll][DebugInfo] Don't add metadata to unrolled remainder loop 2017-09-04 08:12:16 +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] Clamp the VF to the trip count 2017-09-12 16:32:45 +00:00
LoopVersioning [LAA] Correctly return a half-open range in expandBounds 2017-04-05 09:24:26 +00:00
LoopVersioningLICM [LAA] Correctly return a half-open range in expandBounds 2017-04-05 09:24:26 +00:00
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 LowerSwitch: Fix producing invalid IR on unreachable code 2017-04-21 23:54:12 +00:00
LowerTypeTests LowerTypeTests: Add import/export support for targets without absolute symbol constants. 2017-09-11 22:49:10 +00:00
Mem2Reg Parse and print DIExpressions inline to ease IR and MIR testing 2017-08-23 20:31:27 +00:00
MemCpyOpt Add address space mangling to lifetime intrinsics 2017-04-10 20:18:21 +00:00
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 34430 - we need to look through predicateinfo copies to detect self-cycles of phi nodes. We also need to not ignore certain types of arguments when testing whether the phi has a backedge or was originally constant. 2017-09-05 02:17:43 +00:00
ObjCARC [ObjCARC] Pass the correct BasicBlock to fix assertion failure. 2017-08-31 18:27:47 +00:00
PGOProfile Add null check for promoted direct call 2017-08-29 15:28:12 +00:00
PartiallyInlineLibCalls
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PhaseOrdering Make globalaa-retained.ll test catching more cases. 2017-04-18 13:29:26 +00:00
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 [SLP] Test with mutiple uses of conditional op and wrong parent. 2017-09-12 16:15:04 +00:00
SROA Parse and print DIExpressions inline to ease IR and MIR testing 2017-08-23 20:31:27 +00:00
SafeStack Parse and print DIExpressions inline to ease IR and MIR testing 2017-08-23 20:31:27 +00:00
SampleProfile Canonicalize the representation of empty an expression in DIGlobalVariableExpression 2017-08-30 18:06:51 +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 [SimplifyCFG] update test comments; NFC 2017-09-12 23:28:11 +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