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Teresa Johnson df6ad35dda [ThinLTO] Stop importing constant global vars as copies in the backend 
Summary:
We were doing an optimization in the ThinLTO backends of importing
constant unnamed_addr globals unconditionally as a local copy (regardless
of whether the thin link decided to import them). This should be done in
the thin link instead, so that resulting exported references are marked
and promoted appropriately, but will need a summary enhancement to mark
these variables as constant unnamed_addr.

The function import logic during the thin link was trying to handle
this proactively, by conservatively marking all values referenced in
the initializer lists of exported global variables as also exported.
However, this only handled values referenced directly from the
initializer list of an exported global variable. If the value is itself
a constant unnamed_addr variable, we could end up exporting its
references as well. This caused multiple issues. The first is that the
transitively exported references weren't promoted. Secondly, some could
not be promoted/renamed (e.g. they had a section or other constraint).
recursively, instead of just adding the first level of initializer list
references to the ExportList directly.

Remove this optimization and the associated handling in the function
import backend. SPEC measurements indicate we weren't getting much
from it in any case.

Fixes PR31052.

Reviewers: mehdi_amini

Subscribers: krasin, llvm-commits

Differential Revision: https://reviews.llvm.org/D26880

llvm-svn: 288446
2016-12-02 01:02:30 +00:00
..
Inputs Linker: Remove unnecessary call to copyMetadata in IRLinker::linkGlobalVariable. 2016-11-14 23:18:38 +00:00
2002-07-17-GlobalFail.ll
2002-07-17-LinkTest2.ll
2002-08-20-ConstantExpr.ll
2003-01-30-LinkerRename.ll
2003-01-30-LinkerTypeRename.ll
2003-04-23-LinkOnceLost.ll
2003-04-26-NullPtrLinkProblem.ll
2003-05-15-TypeProblem.ll
2003-05-31-LinkerRename.ll
2003-06-02-TypeResolveProblem2.ll
2003-06-02-TypeResolveProblem.ll
2003-08-20-OpaqueTypeResolve.ll
2003-08-23-GlobalVarLinking.ll
2003-08-23-RecursiveOpaqueTypeResolve.ll
2003-08-24-InheritPtrSize.ll
2003-08-28-TypeResolvesGlobal2.ll
2003-08-28-TypeResolvesGlobal3.ll Make "@name =" mandatory for globals in .ll files. 2016-05-10 18:22:45 +00:00
2003-08-28-TypeResolvesGlobal.ll
2003-10-27-LinkOncePromote.ll
2003-11-18-TypeResolution.ll
2004-02-17-WeakStrongLinkage.ll
2004-05-07-TypeResolution1.ll
2004-05-07-TypeResolution2.ll
2004-12-03-DisagreeingType.ll
2005-02-12-ConstantGlobals-2.ll
2005-02-12-ConstantGlobals.ll
2005-12-06-AppendingZeroLengthArrays.ll
2006-01-19-ConstantPacked.ll
2008-03-05-AliasReference2.ll
2008-03-05-AliasReference.ll
2008-03-07-DroppedSection_a.ll
2008-03-07-DroppedSection_b.ll
2008-06-13-LinkOnceRedefinition.ll
2008-06-26-AddressSpace.ll
2008-07-06-AliasFnDecl2.ll
2008-07-06-AliasFnDecl.ll
2008-07-06-AliasWeakDest2.ll
2008-07-06-AliasWeakDest.ll
2009-09-03-mdnode2.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
2009-09-03-mdnode.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
2011-08-04-DebugLoc2.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
2011-08-04-DebugLoc.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
2011-08-04-Metadata2.ll DebugInfo: New metadata representation for global variables. 2016-09-13 01:12:59 +00:00
2011-08-04-Metadata.ll DebugInfo: New metadata representation for global variables. 2016-09-13 01:12:59 +00:00
2011-08-18-unique-class-type2.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
2011-08-18-unique-class-type.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
2011-08-18-unique-debug-type2.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
2011-08-18-unique-debug-type.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
alias-2.ll
alias-3.ll IRLinker: fix double scheduling of mapping a global value because of an alias 2016-05-25 21:00:44 +00:00
alias.ll
alignment.ll
AppendingLinkage2.ll
AppendingLinkage.ll
apple-version.ll
available_externally_a.ll
available_externally_b.ll
available_externally_over_decl.ll
basiclink.ll
broken.ll Don't verify inputs to the Linker if ODR merging. 2016-06-29 18:31:48 +00:00
comdat2.ll
comdat4.ll
comdat5.ll
comdat6.ll
comdat7.ll
comdat8.ll
comdat9.ll Fix lazy linking of comdat members. 2016-03-24 00:06:03 +00:00
comdat10.ll
comdat11.ll
comdat12.ll
comdat13.ll
comdat14.ll ModuleLinker: Do not import linkonce/weak as "external_weak" 2016-04-19 16:11:05 +00:00
comdat15.ll
comdat16.ll Fix logic for which symbols to keep with comdats. 2016-03-23 21:16:33 +00:00
comdat_group.ll
comdat-rm-dst.ll Drop comdats from the dst module if they are not selected. 2016-03-22 21:35:47 +00:00
comdat.ll
ConstantGlobals.ll
constructor-comdat.ll Fix logic for which symbols to keep with comdats. 2016-03-23 21:16:33 +00:00
ctors2.ll
ctors3.ll
ctors4.ll
ctors5.ll
ctors.ll
datalayout.ll
DbgDeclare2.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
DbgDeclare.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
debug-info-global-var.ll Linker: Remove unnecessary call to copyMetadata in IRLinker::linkGlobalVariable. 2016-11-14 23:18:38 +00:00
debug-info-version-a.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
debug-info-version-b.ll
dicompositetype-unique.ll IR: Enable debug info type ODR uniquing for forward decls 2016-04-19 18:00:19 +00:00
distinct-cycles.ll
distinct.ll
dllstorage-a.ll
dllstorage-b.ll
drop-debug.ll
func-attrs-a.ll
func-attrs-b.ll
funcimport2.ll ThinLTO/ModuleLinker: add a flag to not always pull-in linkonce when performing importing 2016-04-21 01:59:39 +00:00
funcimport_appending_global.ll Move summary creation out of llvm-as into opt 2016-04-12 21:35:18 +00:00
funcimport_comdat.ll Move summary creation out of llvm-as into opt 2016-04-12 21:35:18 +00:00
funcimport.ll [ThinLTO] Stop importing constant global vars as copies in the backend 2016-12-02 01:02:30 +00:00
global_ctors.ll
ident.ll
inlineasm.ll
internalize-lazy.ll
link-flags.ll
link-global-to-func.ll
link-type-names.ll
linkage2.ll
linkage.ll
linkmdnode2.ll
linkmdnode.ll
linknamedmdnode2.ll
linknamedmdnode.ll
LinkOnce.ll
lto-attributes.ll
mdlocation.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
metadata-a.ll
metadata-attach.ll Linker: Remove unnecessary call to copyMetadata in IRLinker::linkGlobalVariable. 2016-11-14 23:18:38 +00:00
metadata-b.ll
metadata-function.ll
metadata-with-global-value-operand.ll IR: Drop uniquing when an MDNode Value operand is deleted 2016-08-03 18:19:43 +00:00
module-flags-1-a.ll
module-flags-1-b.ll
module-flags-2-a.ll
module-flags-2-b.ll
module-flags-3-a.ll
module-flags-3-b.ll
module-flags-4-a.ll Linker: teach the IR mover to return llvm::Error. 2016-05-27 05:21:35 +00:00
module-flags-4-b.ll Linker: teach the IR mover to return llvm::Error. 2016-05-27 05:21:35 +00:00
module-flags-5-a.ll
module-flags-5-b.ll
module-flags-6-a.ll
module-flags-6-b.ll
module-flags-7-a.ll
module-flags-7-b.ll
module-flags-8-a.ll
module-flags-8-b.ll
module-flags-dont-change-others.ll
module-flags-pic-1-a.ll
module-flags-pic-2-a.ll
multiple-merged-structs.ll
null_mapping_constant.ll ValueMapper: fix assertion when null-mapping a constant for linking metadata 2016-05-28 17:26:03 +00:00
objectivec-class-property-flag-mismatch.ll Fix autoupgrade logic for Objective-C class properties module flag 2016-09-16 00:38:18 +00:00
odr.ll DebugInfo: New metadata representation for global variables. 2016-09-13 01:12:59 +00:00
only-needed-debug-metadata.ll DebugInfo: New metadata representation for global variables. 2016-09-13 01:12:59 +00:00
only-needed-named-metadata.ll
only-needed-recurse.ll Fix recursive -only-needed. 2016-04-21 14:56:33 +00:00
opaque.ll
override-different-linkage.ll
override-with-internal-linkage-2.ll
override-with-internal-linkage.ll
override.ll
partial-type-refinement-link.ll
partial-type-refinement.ll
pr21374.ll
pr21494.ll
pr22807.ll
pr26037.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
pr27044.ll Fix another case where we were unconditionally linking linkonce GVs. 2016-03-24 15:23:01 +00:00
PR8300.ll
prologuedata.ll
redefinition.ll
replaced-function-matches-first-subprogram.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
subprogram-linkonce-weak.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
targettriple.ll
testlink.ll
thinlto_funcimport_debug.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
transitive-lazy-link.ll
type-unique-alias.ll
type-unique-dst-types.ll
type-unique-inheritance.ll
type-unique-name.ll
type-unique-odr-a.ll DebugInfo: Remove MDString-based type references 2016-04-23 21:08:00 +00:00
type-unique-odr-b.ll DebugInfo: Remove MDString-based type references 2016-04-23 21:08:00 +00:00
type-unique-opaque.ll
type-unique-simple2-a.ll DebugInfo: Remove MDString-based type references 2016-04-23 21:08:00 +00:00
type-unique-simple2-b.ll DebugInfo: Remove MDString-based type references 2016-04-23 21:08:00 +00:00
type-unique-simple2.ll
type-unique-simple-a.ll DebugInfo: Remove MDString-based type references 2016-04-23 21:08:00 +00:00
type-unique-simple-b.ll DebugInfo: Remove MDString-based type references 2016-04-23 21:08:00 +00:00
type-unique-src-type.ll
type-unique-type-array-a.ll DebugInfo: Remove MDString-based type references 2016-04-23 21:08:00 +00:00
type-unique-type-array-b.ll DebugInfo: Remove MDString-based type references 2016-04-23 21:08:00 +00:00
type-unique-unrelated.ll
unique-fwd-decl-a.ll
unique-fwd-decl-order.ll
uniqued-distinct-cycles.ll
unnamed-addr1-a.ll
unnamed-addr1-b.ll
unnamed-addr-err-a.ll
unnamed-addr-err-b.ll
visibility.ll
weakextern.ll