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Andrew Ng 88ce27c39c [LLD][ELF] Improve ICF for relocations to ineligible sections via "aliases" 
ICF was not able to merge equivalent sections because of relocations to
sections ineligible for ICF that use alternative symbols, e.g. symbol
aliases or section relative relocations.

Merging in this scenario has been enabled by giving the sections that
are ineligible for ICF a unique ID, i.e. an equivalence class of their
own. This approach also provides another benefit as it improves the
hashing that is used to perform the initial equivalance grouping for
ICF. This is because the ICF ineligible sections can now contribute a
unique value towards the hashes instead of the same value of zero. This
has been seen to reduce link time with ICF by ~68% for objects compiled
with -fprofile-instr-generate.

In order to facilitate this use of a unique ID, the existing
inconsistent approach to the setting of the InputSection eqClass in ICF
has been changed so that there is a clear distinction between the
eqClass values of ICF eligible sections and those of the ineligible
sections that have a unique ID. This inconsistency could have caused
incorrect equivalence class equality in the past, although it appears
that no issues were encountered in actual use.

Differential Revision: https://reviews.llvm.org/D88830
 		2020-10-15 12:43:14 +01:00
..
Arch Raland D87318 [LLD][PowerPC] Add support for R_PPC64_GOT_TLSGD_PCREL34 used in TLS General Dynamic 2020-10-01 12:36:33 -07:00
AArch64ErrataFix.cpp [ELF] Move the outSecOff addend from relocAlloc/relocNonAlloc/... to InputSectionBase::relocate 2020-08-11 08:06:38 -07:00
AArch64ErrataFix.h [LLD][ELF] Optimize linker script filename glob pattern matching NFC 2020-09-16 10:26:11 +01:00
ARMErrataFix.cpp [ELF] Move the outSecOff addend from relocAlloc/relocNonAlloc/... to InputSectionBase::relocate 2020-08-11 08:06:38 -07:00
ARMErrataFix.h [LLD][ELF] Optimize linker script filename glob pattern matching NFC 2020-09-16 10:26:11 +01:00
CMakeLists.txt [CMake] Make `intrinsics_gen` dependency unconditional. 2020-07-17 16:43:17 -07:00
CallGraphSort.cpp [COFF] Port CallGraphSort to COFF from ELF 2020-07-30 15:21:44 -07:00
CallGraphSort.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
Config.h [LLD][PowerPC] Implement GOT to PC-Rel relaxation 2020-08-17 09:36:09 -05:00
DWARF.cpp [ELF] --gdb-index: skip SHF_GROUP .debug_info 2020-08-13 09:11:01 -07:00
DWARF.h [ELF] --gdb-index: skip SHF_GROUP .debug_info 2020-08-13 09:11:01 -07:00
Driver.cpp [ELF] Don't change binding to STB_WEAK for an undefined specified by -u 2020-10-08 08:31:34 -07:00
Driver.h [Coding style change] Rename variables so that they start with a lowercase letter 2019-07-10 05:00:37 +00:00
DriverUtils.cpp [ELF] Use namespace qualifiers (lld:: or elf::) instead of `namespace lld { namespace elf {` 2020-05-15 08:49:53 -07:00
EhFrame.cpp [ELF] Support .cfi_signal_frame 2020-08-07 22:08:44 -07:00
EhFrame.h [ELF] --icf: don't fold text sections with LSDA 2020-08-05 09:16:28 -07:00
ICF.cpp [LLD][ELF] Improve ICF for relocations to ineligible sections via "aliases" 2020-10-15 12:43:14 +01:00
ICF.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
InputFiles.cpp LLD/AMDGPU: Infer os abi based on input llvm bitcode 2020-10-13 12:20:28 -04:00
InputFiles.h [LLD][ELF] Optimize linker script filename glob pattern matching NFC 2020-09-16 10:26:11 +01:00
InputSection.cpp [lib/Object] - Refine interface of ELFFile<ELFT>. NFCI. 2020-09-15 11:38:31 +03:00
InputSection.h [ELF] --icf: don't fold text sections with LSDA 2020-08-05 09:16:28 -07:00
LTO.cpp Flush bitcode incrementally for LTO output 2020-09-17 03:32:31 +00:00
LTO.h [Coding style change] Rename variables so that they start with a lowercase letter 2019-07-10 05:00:37 +00:00
LinkerScript.cpp [LLD][ELF] Optimize linker script filename glob pattern matching NFC 2020-09-16 10:26:11 +01:00
LinkerScript.h [LLD][ELF] Optimize linker script filename glob pattern matching NFC 2020-09-16 10:26:11 +01:00
MapFile.cpp [ELF] Use namespace qualifiers (lld:: or elf::) instead of `namespace lld { namespace elf {` 2020-05-15 08:49:53 -07:00
MapFile.h [ELF] Add --print-archive-stats= 2020-04-29 18:04:37 -07:00
MarkLive.cpp [LLD][ELF] Fix performance of MarkLive::scanEhFrameSection 2020-09-08 19:32:34 +01:00
MarkLive.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
Options.td [LLD] [ELF] Fix the help listing for the wrap option. NFC. 2020-10-09 15:32:00 +03:00
OutputSections.cpp [ELF] -r: allow SHT_X86_64_UNWIND to be merged into SHT_PROGBITS 2020-08-13 08:14:45 -07:00
OutputSections.h [ELF] Refactor uses of getInputSections to improve efficiency NFC 2020-01-21 12:27:52 +00:00
README.md
…
Relocations.cpp Raland D87318 [LLD][PowerPC] Add support for R_PPC64_GOT_TLSGD_PCREL34 used in TLS General Dynamic 2020-10-01 12:36:33 -07:00
Relocations.h [LLD][ELF] Optimize linker script filename glob pattern matching NFC 2020-09-16 10:26:11 +01:00
ScriptLexer.cpp [LLD][ELF] - Linkerscript: report location for the "unclosed comment in a linker script" error. 2020-07-24 11:38:26 +03:00
ScriptLexer.h [LLD][ELF] - Linkerscript: report location for the "unclosed comment in a linker script" error. 2020-07-24 11:38:26 +03:00
ScriptParser.cpp [lld][linkerscript] Fix handling of DEFINED. 2020-07-28 21:18:01 +01:00
ScriptParser.h [ELF] Improve --export-dynamic-symbol performance by checking whether wildcard is really used 2020-06-17 17:12:10 -07:00
SymbolTable.cpp [ELF] --wrap: don't leave the original symbol as SHN_UNDEF in .symtab or .dynsym 2020-08-08 18:18:20 -07:00
SymbolTable.h [ELF] Replace SymbolTable::forEachSymbol with iterator_range symbols() 2019-11-26 09:09:32 -08:00
Symbols.cpp [ELF] Refine --export-dynamic-symbol semantics to be compatible GNU ld 2.35 2020-06-01 11:30:03 -07:00
Symbols.h [LLD][ELF] Implement --discard-* for cases when -r or --emit-relocs are used. 2020-04-25 18:59:41 +07:00
SyntheticSections.cpp [PowerPC] Fix thunk alignment issue when using pc-rel instruction 2020-08-17 09:09:36 -05:00
SyntheticSections.h [ELF] Handle SHT_RISCV_ATTRIBUTES similarly to SHT_ARM_ATTRIBUTES 2020-09-05 18:36:23 +01:00
Target.cpp [ELF] Use namespace qualifiers (lld:: or elf::) instead of `namespace lld { namespace elf {` 2020-05-15 08:49:53 -07:00
Target.h [ELF] Define a reportRangeError() overload for thunks and tidy up recent PPC64 thunk range errors 2020-09-14 09:55:59 -07:00
Thunks.cpp [PowerPC][LLD] Extend R2 save stub to support offsets of more than 26 bits 2020-09-25 06:39:14 -05:00
Thunks.h [ELF][PPC32] Implement IPLT code sequence for non-preemptible IFUNC 2019-12-29 22:42:53 -08:00
Writer.cpp [lld] Make -z keep-text-section-prefix recognize .text.split. as a prefix. 2020-09-24 15:02:48 -07:00
Writer.h Revert "Revert r370635, it caused PR43241." 2019-09-06 15:57:24 +00:00

README.md

See docs/NewLLD.rst