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llvm-project/llvm/test/ThinLTO/X86/deadstrip.ll

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[ThinLTO] Print names in function import debug messages when available Summary: Rather than just print the GUID, when it is available in the index, print the global name as well in the function import thin link debug messages. Names will be available when the combined index is being built by the same process, e.g. a linker or "llvm-lto2 run". Reviewers: davidxl Subscribers: mehdi_amini, inglorion, eraman, steven_wu, llvm-commits Differential Revision: https://reviews.llvm.org/D48612 llvm-svn: 335760
2018-06-28 02:03:39 +08:00
; Require asserts for -debug-only
; REQUIRES: asserts
ThinLTO: add early "dead-stripping" on the Index Summary: Using the linker-supplied list of "preserved" symbols, we can compute the list of "dead" symbols, i.e. the one that are not reachable from a "preserved" symbol transitively on the reference graph. Right now we are using this information to mark these functions as non-eligible for import. The impact is two folds: - Reduction of compile time: we don't import these functions anywhere or import the function these symbols are calling. - The limited number of import/export leads to better internalization. Patch originally by Mehdi Amini. Reviewers: mehdi_amini, pcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D23488 llvm-svn: 291177
2017-01-06 05:34:18 +08:00
; RUN: opt -module-summary %s -o %t1.bc
; RUN: opt -module-summary %p/Inputs/deadstrip.ll -o %t2.bc
; RUN: llvm-lto -thinlto-action=thinlink -o %t.index.bc %t1.bc %t2.bc
; RUN: llvm-lto -exported-symbol=_main -thinlto-action=promote %t1.bc -thinlto-index=%t.index.bc -o - | llvm-lto -exported-symbol=_main -thinlto-action=internalize -thinlto-index %t.index.bc -thinlto-module-id=%t1.bc - -o - | llvm-dis -o - | FileCheck %s
Revert "[ThinLTO] Add an auto-hide feature" This reverts commit r293970. After more discussion, this belongs to the linker side and there is no added value to do it at this level. llvm-svn: 293993
2017-02-03 15:41:43 +08:00
; RUN: llvm-lto -exported-symbol=_main -thinlto-action=promote %t2.bc -thinlto-index=%t.index.bc -o - | llvm-lto -exported-symbol=_main -thinlto-action=internalize -thinlto-index %t.index.bc -thinlto-module-id=%t2.bc - -o - | llvm-dis -o - | FileCheck %s --check-prefix=CHECK2
ThinLTO: add early "dead-stripping" on the Index Summary: Using the linker-supplied list of "preserved" symbols, we can compute the list of "dead" symbols, i.e. the one that are not reachable from a "preserved" symbol transitively on the reference graph. Right now we are using this information to mark these functions as non-eligible for import. The impact is two folds: - Reduction of compile time: we don't import these functions anywhere or import the function these symbols are calling. - The limited number of import/export leads to better internalization. Patch originally by Mehdi Amini. Reviewers: mehdi_amini, pcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D23488 llvm-svn: 291177
2017-01-06 05:34:18 +08:00
; RUN: llvm-lto -exported-symbol=_main -thinlto-action=run %t1.bc %t2.bc
; RUN: llvm-nm %t1.bc.thinlto.o | FileCheck %s --check-prefix=CHECK-NM
llvm-lto2: Move the LTO::run() action behind a subcommand. Move LTO::run() to a "run" subcommand so that we can introduce new subcommands for testing different parts of the LTO implementation. This doesn't use llvm::cl subcommands because it doesn't appear to be currently possible to pass an argument not associated with a subcommand to a subcommand (e.g. -lto-use-new-pm, -mcpu=yonah). Differential Revision: https://reviews.llvm.org/D31410 llvm-svn: 299967
2017-04-12 02:12:00 +08:00
; RUN: llvm-lto2 run %t1.bc %t2.bc -o %t.out -save-temps \
ThinLTO: add early "dead-stripping" on the Index Summary: Using the linker-supplied list of "preserved" symbols, we can compute the list of "dead" symbols, i.e. the one that are not reachable from a "preserved" symbol transitively on the reference graph. Right now we are using this information to mark these functions as non-eligible for import. The impact is two folds: - Reduction of compile time: we don't import these functions anywhere or import the function these symbols are calling. - The limited number of import/export leads to better internalization. Patch originally by Mehdi Amini. Reviewers: mehdi_amini, pcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D23488 llvm-svn: 291177
2017-01-06 05:34:18 +08:00
; RUN: -r %t1.bc,_main,plx \
; RUN: -r %t1.bc,_bar,pl \
; RUN: -r %t1.bc,_dead_func,pl \
; RUN: -r %t1.bc,_baz,l \
; RUN: -r %t1.bc,_boo,l \
Reland r327041: [ThinLTO] Keep available_externally symbols live Summary: This change fixes PR36483. The bug was originally introduced by a change that marked non-prevailing symbols dead. This broke LowerTypeTests handling of available_externally functions, which are non-prevailing. LowerTypeTests uses liveness information to avoid emitting thunks for unused functions. Marking available_externally functions dead is incorrect, the functions are used though the function definitions are not. This change keeps them live, and lets the EliminateAvailableExternally/GlobalDCE passes remove them later instead. (Reland with a suspected fix for a unit test failure I haven't been able to reproduce locally) Reviewers: pcc, tejohnson Reviewed By: tejohnson Subscribers: grimar, mehdi_amini, inglorion, eraman, llvm-commits Differential Revision: https://reviews.llvm.org/D43690 llvm-svn: 327360
2018-03-13 13:08:48 +08:00
; RUN: -r %t1.bc,_live_available_externally_func,l \
ThinLTO: add early "dead-stripping" on the Index Summary: Using the linker-supplied list of "preserved" symbols, we can compute the list of "dead" symbols, i.e. the one that are not reachable from a "preserved" symbol transitively on the reference graph. Right now we are using this information to mark these functions as non-eligible for import. The impact is two folds: - Reduction of compile time: we don't import these functions anywhere or import the function these symbols are calling. - The limited number of import/export leads to better internalization. Patch originally by Mehdi Amini. Reviewers: mehdi_amini, pcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D23488 llvm-svn: 291177
2017-01-06 05:34:18 +08:00
; RUN: -r %t2.bc,_baz,pl \
; RUN: -r %t2.bc,_boo,pl \
[ThinLTO] Disallow multiple prevailing defs https://reviews.llvm.org/D41291 llvm-svn: 320825
2017-12-16 00:27:33 +08:00
; RUN: -r %t2.bc,_dead_func,l \
[ThinLTO] Print names in function import debug messages when available Summary: Rather than just print the GUID, when it is available in the index, print the global name as well in the function import thin link debug messages. Names will be available when the combined index is being built by the same process, e.g. a linker or "llvm-lto2 run". Reviewers: davidxl Subscribers: mehdi_amini, inglorion, eraman, steven_wu, llvm-commits Differential Revision: https://reviews.llvm.org/D48612 llvm-svn: 335760
2018-06-28 02:03:39 +08:00
; RUN: -r %t2.bc,_another_dead_func,pl \
; RUN: -thinlto-threads=1 \
[ThinLTO] Fix test Fix test changes added in r335760. Even though we are invoking llvm-lto2 in single threaded mode, the order of processing the modules in the backend is apparently not deterministic. Handle the expected debug messages in any order. (The determinism would be good to fix, but not related to this change.) This also undoes the change I made in r335764 to help debug this. llvm-svn: 335766
2018-06-28 03:00:35 +08:00
; RUN: -debug-only=function-import 2>&1 | FileCheck %s --check-prefix=DEBUG
[LTO] Update tests for r320905 llvm-svn: 320909
2017-12-16 10:40:20 +08:00
; RUN: llvm-dis < %t.out.1.3.import.bc | FileCheck %s --check-prefix=LTO2
[LTO] Make processing of combined module more consistent Summary: 1. Use stream 0 only for combined module. Previously if combined module was not processes ThinLTO used the stream for own output. However small changes in input, could trigger combined module and shuffle outputs making life of llvm::LTO harder. 2. Always process combined module and write output to stream 0. Processing empty combined module is cheap and allows llvm::LTO users to avoid implementing processing which is already done in llvm::LTO. Subscribers: mehdi_amini, inglorion, eraman, hiraditya Differential Revision: https://reviews.llvm.org/D41267 llvm-svn: 320905
2017-12-16 10:10:00 +08:00
; RUN: llvm-dis < %t.out.2.3.import.bc | FileCheck %s --check-prefix=LTO2-CHECK2
ThinLTO: add early "dead-stripping" on the Index Summary: Using the linker-supplied list of "preserved" symbols, we can compute the list of "dead" symbols, i.e. the one that are not reachable from a "preserved" symbol transitively on the reference graph. Right now we are using this information to mark these functions as non-eligible for import. The impact is two folds: - Reduction of compile time: we don't import these functions anywhere or import the function these symbols are calling. - The limited number of import/export leads to better internalization. Patch originally by Mehdi Amini. Reviewers: mehdi_amini, pcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D23488 llvm-svn: 291177
2017-01-06 05:34:18 +08:00
; RUN: llvm-nm %t.out.1 | FileCheck %s --check-prefix=CHECK2-NM
Move summary dead stripping before regular LTO. This way dead stripping results are recorded in combined summary and can be used in regular LTO passes. Differential Revision: https://reviews.llvm.org/D33615 llvm-svn: 304577
2017-06-03 02:24:17 +08:00
; RUN: llvm-bcanalyzer -dump %t.out.index.bc | FileCheck %s --check-prefix=COMBINED
Make internal/private GVs implicitly dso_local. While updating clang tests for having clang set dso_local I noticed that: - There are *a lot* of tests to update. - Many of the updates are redundant. They are redundant because a GV is "obviously dso_local". This patch starts formalizing that a bit by requiring that internal and private GVs be dso_local too. Since they all are, we don't have to print dso_local to the textual representation, making it a bit more compact and easier to read. llvm-svn: 322317
2018-01-12 06:15:05 +08:00
; Live, NotEligibleForImport, dso_local, Internal
; COMBINED-DAG: <COMBINED {{.*}} op2=119
; Live, dso_local, Internal
; COMBINED-DAG: <COMBINED {{.*}} op2=103
Reland r327041: [ThinLTO] Keep available_externally symbols live Summary: This change fixes PR36483. The bug was originally introduced by a change that marked non-prevailing symbols dead. This broke LowerTypeTests handling of available_externally functions, which are non-prevailing. LowerTypeTests uses liveness information to avoid emitting thunks for unused functions. Marking available_externally functions dead is incorrect, the functions are used though the function definitions are not. This change keeps them live, and lets the EliminateAvailableExternally/GlobalDCE passes remove them later instead. (Reland with a suspected fix for a unit test failure I haven't been able to reproduce locally) Reviewers: pcc, tejohnson Reviewed By: tejohnson Subscribers: grimar, mehdi_amini, inglorion, eraman, llvm-commits Differential Revision: https://reviews.llvm.org/D43690 llvm-svn: 327360
2018-03-13 13:08:48 +08:00
; Live, Local, AvailableExternally
; COMBINED-DAG: <COMBINED {{.*}} op2=97
[LTO][ThinLTO] Use the linker resolutions to mark global values as dso_local. Now that we have a way to mark GlobalValues as local we can use the symbol resolutions that the linker plugin provides as part of lto/thinlto link step to refine the compilers view on what symbols will end up being local. Originally commited as r317374, but reverted in r317395 to update some missed tests. Differential Revision: https://reviews.llvm.org/D35702 llvm-svn: 317408
2017-11-05 01:04:39 +08:00
; Live, Local, External
; COMBINED-DAG: <COMBINED {{.*}} op2=96
; COMBINED-DAG: <COMBINED {{.*}} op2=96
; COMBINED-DAG: <COMBINED {{.*}} op2=96
; Local, (Dead)
; COMBINED-DAG: <COMBINED {{.*}} op2=64
; COMBINED-DAG: <COMBINED {{.*}} op2=64
; COMBINED-DAG: <COMBINED {{.*}} op2=64
Move summary dead stripping before regular LTO. This way dead stripping results are recorded in combined summary and can be used in regular LTO passes. Differential Revision: https://reviews.llvm.org/D33615 llvm-svn: 304577
2017-06-03 02:24:17 +08:00
ThinLTO: add early "dead-stripping" on the Index Summary: Using the linker-supplied list of "preserved" symbols, we can compute the list of "dead" symbols, i.e. the one that are not reachable from a "preserved" symbol transitively on the reference graph. Right now we are using this information to mark these functions as non-eligible for import. The impact is two folds: - Reduction of compile time: we don't import these functions anywhere or import the function these symbols are calling. - The limited number of import/export leads to better internalization. Patch originally by Mehdi Amini. Reviewers: mehdi_amini, pcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D23488 llvm-svn: 291177
2017-01-06 05:34:18 +08:00
; Dead-stripping on the index allows to internalize these,
; and limit the import of @baz thanks to early pruning.
; CHECK-NOT: available_externally {{.*}} @baz()
; CHECK: @llvm.global_ctors =
; CHECK: define internal void @_GLOBAL__I_a()
; CHECK: define internal void @bar() {
; CHECK: define internal void @bar_internal()
; CHECK: define internal void @dead_func() {
; CHECK-NOT: available_externally {{.*}} @baz()
[LTO][ThinLTO] Use the linker resolutions to mark global values as dso_local. Now that we have a way to mark GlobalValues as local we can use the symbol resolutions that the linker plugin provides as part of lto/thinlto link step to refine the compilers view on what symbols will end up being local. Originally commited as r317374, but reverted in r317395 to update some missed tests. Differential Revision: https://reviews.llvm.org/D35702 llvm-svn: 317408
2017-11-05 01:04:39 +08:00
; LTO2-NOT: available_externally {{.*}} @baz()
; LTO2: @llvm.global_ctors =
; LTO2: define internal void @_GLOBAL__I_a()
Make internal/private GVs implicitly dso_local. While updating clang tests for having clang set dso_local I noticed that: - There are *a lot* of tests to update. - Many of the updates are redundant. They are redundant because a GV is "obviously dso_local". This patch starts formalizing that a bit by requiring that internal and private GVs be dso_local too. Since they all are, we don't have to print dso_local to the textual representation, making it a bit more compact and easier to read. llvm-svn: 322317
2018-01-12 06:15:05 +08:00
; LTO2: define internal void @bar() {
[LTO][ThinLTO] Use the linker resolutions to mark global values as dso_local. Now that we have a way to mark GlobalValues as local we can use the symbol resolutions that the linker plugin provides as part of lto/thinlto link step to refine the compilers view on what symbols will end up being local. Originally commited as r317374, but reverted in r317395 to update some missed tests. Differential Revision: https://reviews.llvm.org/D35702 llvm-svn: 317408
2017-11-05 01:04:39 +08:00
; LTO2: define internal void @bar_internal()
[ThinLTO] Remove dead and dropped symbol declarations when possible Summary: Removing the dropped symbols will prevent indirect call promotion in the ThinLTO Backend from adding a new reference to a symbol, which can result in linker unsats. This can happen when we compile with a sample profile collected from one binary by used for another, which may have profiled targets that aren't used in the new binary. Note that until dropDeadSymbols handles variables and aliases (in progress), we may not be able to remove the declaration and can still have an issue. Reviewers: grimar, davidxl Subscribers: mehdi_amini, inglorion, llvm-commits, eraman Differential Revision: https://reviews.llvm.org/D42816 llvm-svn: 324299
2018-02-06 08:43:39 +08:00
; LTO2-NOT: @dead_func()
[LTO][ThinLTO] Use the linker resolutions to mark global values as dso_local. Now that we have a way to mark GlobalValues as local we can use the symbol resolutions that the linker plugin provides as part of lto/thinlto link step to refine the compilers view on what symbols will end up being local. Originally commited as r317374, but reverted in r317395 to update some missed tests. Differential Revision: https://reviews.llvm.org/D35702 llvm-svn: 317408
2017-11-05 01:04:39 +08:00
; LTO2-NOT: available_externally {{.*}} @baz()
ThinLTO: add early "dead-stripping" on the Index Summary: Using the linker-supplied list of "preserved" symbols, we can compute the list of "dead" symbols, i.e. the one that are not reachable from a "preserved" symbol transitively on the reference graph. Right now we are using this information to mark these functions as non-eligible for import. The impact is two folds: - Reduction of compile time: we don't import these functions anywhere or import the function these symbols are calling. - The limited number of import/export leads to better internalization. Patch originally by Mehdi Amini. Reviewers: mehdi_amini, pcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D23488 llvm-svn: 291177
2017-01-06 05:34:18 +08:00
; Make sure we didn't internalize @boo, which is reachable via
; llvm.global_ctors
Revert "[ThinLTO] Add an auto-hide feature" This reverts commit r293970. After more discussion, this belongs to the linker side and there is no added value to do it at this level. llvm-svn: 293993
2017-02-03 15:41:43 +08:00
; CHECK2: define void @boo()
[LTO][ThinLTO] Use the linker resolutions to mark global values as dso_local. Now that we have a way to mark GlobalValues as local we can use the symbol resolutions that the linker plugin provides as part of lto/thinlto link step to refine the compilers view on what symbols will end up being local. Originally commited as r317374, but reverted in r317395 to update some missed tests. Differential Revision: https://reviews.llvm.org/D35702 llvm-svn: 317408
2017-11-05 01:04:39 +08:00
; LTO2-CHECK2: define dso_local void @boo()
Move summary dead stripping before regular LTO. This way dead stripping results are recorded in combined summary and can be used in regular LTO passes. Differential Revision: https://reviews.llvm.org/D33615 llvm-svn: 304577
2017-06-03 02:24:17 +08:00
; We should have eventually removed @baz since it was internalized and unused
ThinLTO: add early "dead-stripping" on the Index Summary: Using the linker-supplied list of "preserved" symbols, we can compute the list of "dead" symbols, i.e. the one that are not reachable from a "preserved" symbol transitively on the reference graph. Right now we are using this information to mark these functions as non-eligible for import. The impact is two folds: - Reduction of compile time: we don't import these functions anywhere or import the function these symbols are calling. - The limited number of import/export leads to better internalization. Patch originally by Mehdi Amini. Reviewers: mehdi_amini, pcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D23488 llvm-svn: 291177
2017-01-06 05:34:18 +08:00
; CHECK2-NM-NOT: _baz
; The final binary should not contain any of the dead functions,
; only main is expected because bar is expected to be inlined and stripped out.
; CHECK-NM-NOT: bar
; CHECK-NM-NOT: dead
; CHECK-NM: T _main
; CHECK-NM-NOT: bar
; CHECK-NM-NOT: dead
[ThinLTO] Fix test Fix test changes added in r335760. Even though we are invoking llvm-lto2 in single threaded mode, the order of processing the modules in the backend is apparently not deterministic. Handle the expected debug messages in any order. (The determinism would be good to fix, but not related to this change.) This also undoes the change I made in r335764 to help debug this. llvm-svn: 335766
2018-06-28 03:00:35 +08:00
; DEBUG-DAG: Live root: 2412314959268824392 (llvm.global_ctors)
; DEBUG-DAG: Live root: 15822663052811949562 (main)
; DEBUG-DAG: Ignores Dead GUID: 7342339837106705152 (dead_func)
; DEBUG-DAG: Ignores Dead GUID: 7546896869197086323 (baz)
; DEBUG-DAG: Initialize import for 15611644523426561710 (boo)
; DEBUG-DAG: Ignores Dead GUID: 2384416018110111308 (another_dead_func)
[ThinLTO] Print names in function import debug messages when available Summary: Rather than just print the GUID, when it is available in the index, print the global name as well in the function import thin link debug messages. Names will be available when the combined index is being built by the same process, e.g. a linker or "llvm-lto2 run". Reviewers: davidxl Subscribers: mehdi_amini, inglorion, eraman, steven_wu, llvm-commits Differential Revision: https://reviews.llvm.org/D48612 llvm-svn: 335760
2018-06-28 02:03:39 +08:00
ThinLTO: add early "dead-stripping" on the Index Summary: Using the linker-supplied list of "preserved" symbols, we can compute the list of "dead" symbols, i.e. the one that are not reachable from a "preserved" symbol transitively on the reference graph. Right now we are using this information to mark these functions as non-eligible for import. The impact is two folds: - Reduction of compile time: we don't import these functions anywhere or import the function these symbols are calling. - The limited number of import/export leads to better internalization. Patch originally by Mehdi Amini. Reviewers: mehdi_amini, pcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D23488 llvm-svn: 291177
2017-01-06 05:34:18 +08:00
; Next test the case where Inputs/deadstrip.ll does not get a module index,
; which will cause it to be handled by regular LTO in the new LTO API.
; In that case there are uses of @dead_func in the regular LTO partition
; and it shouldn't be internalized.
; RUN: opt %p/Inputs/deadstrip.ll -o %t3.bc
llvm-lto2: Move the LTO::run() action behind a subcommand. Move LTO::run() to a "run" subcommand so that we can introduce new subcommands for testing different parts of the LTO implementation. This doesn't use llvm::cl subcommands because it doesn't appear to be currently possible to pass an argument not associated with a subcommand to a subcommand (e.g. -lto-use-new-pm, -mcpu=yonah). Differential Revision: https://reviews.llvm.org/D31410 llvm-svn: 299967
2017-04-12 02:12:00 +08:00
; RUN: llvm-lto2 run %t1.bc %t3.bc -o %t4.out -save-temps \
ThinLTO: add early "dead-stripping" on the Index Summary: Using the linker-supplied list of "preserved" symbols, we can compute the list of "dead" symbols, i.e. the one that are not reachable from a "preserved" symbol transitively on the reference graph. Right now we are using this information to mark these functions as non-eligible for import. The impact is two folds: - Reduction of compile time: we don't import these functions anywhere or import the function these symbols are calling. - The limited number of import/export leads to better internalization. Patch originally by Mehdi Amini. Reviewers: mehdi_amini, pcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D23488 llvm-svn: 291177
2017-01-06 05:34:18 +08:00
; RUN: -r %t1.bc,_main,plx \
; RUN: -r %t1.bc,_bar,pl \
; RUN: -r %t1.bc,_dead_func,pl \
; RUN: -r %t1.bc,_baz,l \
; RUN: -r %t1.bc,_boo,l \
Reland r327041: [ThinLTO] Keep available_externally symbols live Summary: This change fixes PR36483. The bug was originally introduced by a change that marked non-prevailing symbols dead. This broke LowerTypeTests handling of available_externally functions, which are non-prevailing. LowerTypeTests uses liveness information to avoid emitting thunks for unused functions. Marking available_externally functions dead is incorrect, the functions are used though the function definitions are not. This change keeps them live, and lets the EliminateAvailableExternally/GlobalDCE passes remove them later instead. (Reland with a suspected fix for a unit test failure I haven't been able to reproduce locally) Reviewers: pcc, tejohnson Reviewed By: tejohnson Subscribers: grimar, mehdi_amini, inglorion, eraman, llvm-commits Differential Revision: https://reviews.llvm.org/D43690 llvm-svn: 327360
2018-03-13 13:08:48 +08:00
; RUN: -r %t1.bc,_live_available_externally_func,l \
ThinLTO: add early "dead-stripping" on the Index Summary: Using the linker-supplied list of "preserved" symbols, we can compute the list of "dead" symbols, i.e. the one that are not reachable from a "preserved" symbol transitively on the reference graph. Right now we are using this information to mark these functions as non-eligible for import. The impact is two folds: - Reduction of compile time: we don't import these functions anywhere or import the function these symbols are calling. - The limited number of import/export leads to better internalization. Patch originally by Mehdi Amini. Reviewers: mehdi_amini, pcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D23488 llvm-svn: 291177
2017-01-06 05:34:18 +08:00
; RUN: -r %t3.bc,_baz,pl \
; RUN: -r %t3.bc,_boo,pl \
[ThinLTO] Disallow multiple prevailing defs https://reviews.llvm.org/D41291 llvm-svn: 320825
2017-12-16 00:27:33 +08:00
; RUN: -r %t3.bc,_dead_func,l \
ThinLTO: add early "dead-stripping" on the Index Summary: Using the linker-supplied list of "preserved" symbols, we can compute the list of "dead" symbols, i.e. the one that are not reachable from a "preserved" symbol transitively on the reference graph. Right now we are using this information to mark these functions as non-eligible for import. The impact is two folds: - Reduction of compile time: we don't import these functions anywhere or import the function these symbols are calling. - The limited number of import/export leads to better internalization. Patch originally by Mehdi Amini. Reviewers: mehdi_amini, pcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D23488 llvm-svn: 291177
2017-01-06 05:34:18 +08:00
; RUN: -r %t3.bc,_another_dead_func,pl
; RUN: llvm-dis < %t4.out.1.3.import.bc | FileCheck %s --check-prefix=CHECK-NOTDEAD
; RUN: llvm-nm %t4.out.0 | FileCheck %s --check-prefix=CHECK-NM-NOTDEAD
; We can't internalize @dead_func because of the use in the regular LTO
; partition.
[LTO][ThinLTO] Use the linker resolutions to mark global values as dso_local. Now that we have a way to mark GlobalValues as local we can use the symbol resolutions that the linker plugin provides as part of lto/thinlto link step to refine the compilers view on what symbols will end up being local. Originally commited as r317374, but reverted in r317395 to update some missed tests. Differential Revision: https://reviews.llvm.org/D35702 llvm-svn: 317408
2017-11-05 01:04:39 +08:00
; CHECK-NOTDEAD: define dso_local void @dead_func()
ThinLTO: add early "dead-stripping" on the Index Summary: Using the linker-supplied list of "preserved" symbols, we can compute the list of "dead" symbols, i.e. the one that are not reachable from a "preserved" symbol transitively on the reference graph. Right now we are using this information to mark these functions as non-eligible for import. The impact is two folds: - Reduction of compile time: we don't import these functions anywhere or import the function these symbols are calling. - The limited number of import/export leads to better internalization. Patch originally by Mehdi Amini. Reviewers: mehdi_amini, pcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D23488 llvm-svn: 291177
2017-01-06 05:34:18 +08:00
; We also can't eliminate @baz because it is in the regular LTO partition
; and called from @dead_func.
; CHECK-NM-NOTDEAD: T _baz
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.11.0"
@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 65535, void ()* @_GLOBAL__I_a }]
declare void @baz()
declare void @boo()
define internal void @_GLOBAL__I_a() #1 section "__TEXT,__StaticInit,regular,pure_instructions" {
entry:
call void @boo()
ret void
}
define void @bar() {
ret void
}
define internal void @bar_internal() {
ret void
}
define void @dead_func() {
call void @bar()
call void @baz()
call void @bar_internal()
ret void
}
Reland r327041: [ThinLTO] Keep available_externally symbols live Summary: This change fixes PR36483. The bug was originally introduced by a change that marked non-prevailing symbols dead. This broke LowerTypeTests handling of available_externally functions, which are non-prevailing. LowerTypeTests uses liveness information to avoid emitting thunks for unused functions. Marking available_externally functions dead is incorrect, the functions are used though the function definitions are not. This change keeps them live, and lets the EliminateAvailableExternally/GlobalDCE passes remove them later instead. (Reland with a suspected fix for a unit test failure I haven't been able to reproduce locally) Reviewers: pcc, tejohnson Reviewed By: tejohnson Subscribers: grimar, mehdi_amini, inglorion, eraman, llvm-commits Differential Revision: https://reviews.llvm.org/D43690 llvm-svn: 327360
2018-03-13 13:08:48 +08:00
define available_externally void @live_available_externally_func() {
ret void
}
ThinLTO: add early "dead-stripping" on the Index Summary: Using the linker-supplied list of "preserved" symbols, we can compute the list of "dead" symbols, i.e. the one that are not reachable from a "preserved" symbol transitively on the reference graph. Right now we are using this information to mark these functions as non-eligible for import. The impact is two folds: - Reduction of compile time: we don't import these functions anywhere or import the function these symbols are calling. - The limited number of import/export leads to better internalization. Patch originally by Mehdi Amini. Reviewers: mehdi_amini, pcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D23488 llvm-svn: 291177
2017-01-06 05:34:18 +08:00
define void @main() {
call void @bar()
call void @bar_internal()
Reland r327041: [ThinLTO] Keep available_externally symbols live Summary: This change fixes PR36483. The bug was originally introduced by a change that marked non-prevailing symbols dead. This broke LowerTypeTests handling of available_externally functions, which are non-prevailing. LowerTypeTests uses liveness information to avoid emitting thunks for unused functions. Marking available_externally functions dead is incorrect, the functions are used though the function definitions are not. This change keeps them live, and lets the EliminateAvailableExternally/GlobalDCE passes remove them later instead. (Reland with a suspected fix for a unit test failure I haven't been able to reproduce locally) Reviewers: pcc, tejohnson Reviewed By: tejohnson Subscribers: grimar, mehdi_amini, inglorion, eraman, llvm-commits Differential Revision: https://reviews.llvm.org/D43690 llvm-svn: 327360
2018-03-13 13:08:48 +08:00
call void @live_available_externally_func()
ThinLTO: add early "dead-stripping" on the Index Summary: Using the linker-supplied list of "preserved" symbols, we can compute the list of "dead" symbols, i.e. the one that are not reachable from a "preserved" symbol transitively on the reference graph. Right now we are using this information to mark these functions as non-eligible for import. The impact is two folds: - Reduction of compile time: we don't import these functions anywhere or import the function these symbols are calling. - The limited number of import/export leads to better internalization. Patch originally by Mehdi Amini. Reviewers: mehdi_amini, pcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D23488 llvm-svn: 291177
2017-01-06 05:34:18 +08:00
ret void
}