llvm-project/lld
Daniel Bertalan 1fb9466c6a [lld-macho] Devirtualize TargetInfo::getRelocAttrs
This method is called on each relocation when parsing input files, so
the overhead of using virtual functions ends up being quite large.  We
now have a single non-virtual method, which reads from the appropriate
array of relocation attributes set in the TargetInfo constructor.

This change results in a modest 2.3% reduction in link time for
chromium_framework measured on an x86-64 VPS, and 0.7% on an arm64 Mac.

    N           Min           Max        Median           Avg        Stddev
x  10     11.869417     12.032609     11.935041     11.938268   0.045802324
+  10     11.581526     11.785265     11.649885     11.659507   0.054634834
Difference at 95.0% confidence
	-0.278761 +/- 0.0473673
	-2.33502% +/- 0.396768%
	(Student's t, pooled s = 0.0504124)

Differential Revision: https://reviews.llvm.org/D130000
2022-07-18 19:32:58 +02:00
..
COFF [COFF] Add vfsoverlay flag 2022-07-11 21:31:01 +00:00
Common [lld-macho] Add support for -w 2022-06-11 17:38:50 -07:00
ELF Use value instead of getValue (NFC) 2022-07-15 20:03:13 -07:00
MachO [lld-macho] Devirtualize TargetInfo::getRelocAttrs 2022-07-18 19:32:58 +02:00
MinGW [LLD] [MinGW] Implement --disable-reloc-section, mapped to /fixed 2022-06-15 16:51:20 +03:00
cmake/modules Revert "[cmake] Don't export `LLVM_TOOLS_INSTALL_DIR` anymore" 2022-06-10 19:26:12 +00:00
docs [lld-macho] Enable EH frame relocation / pruning 2022-07-13 21:14:05 -04:00
include/lld/Common [NFC][lld] Fix typos to test commit access 2022-06-24 00:19:18 +02:00
test fix comment typo to cycle bots 2022-07-17 09:10:05 -04:00
tools/lld [LLD][ELF] Add FORCE_LLD_DIAGNOSTICS_CRASH to force LLD to crash 2022-07-05 09:43:09 +01:00
utils
wasm Use value instead of getValue (NFC) 2022-07-15 20:03:13 -07:00
.clang-format
.clang-tidy NFC: .clang-tidy: Inherit configs from parents to improve maintainability 2021-06-08 08:25:59 -07:00
.gitignore
CMakeLists.txt [NFC][lld] Fix typos to test commit access 2022-06-24 00:19:18 +02:00
CODE_OWNERS.TXT
LICENSE.TXT
README.md [doc] Place sha256 in lld/README.md into backticks 2021-01-12 10:19:40 -08:00

README.md

LLVM Linker (lld)

This directory and its subdirectories contain source code for the LLVM Linker, a modular cross platform linker which is built as part of the LLVM compiler infrastructure project.

lld is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.

Benchmarking

In order to make sure various developers can evaluate patches over the same tests, we create a collection of self contained programs.

It is hosted at https://s3-us-west-2.amazonaws.com/linker-tests/lld-speed-test.tar.xz

The current sha256 is 10eec685463d5a8bbf08d77f4ca96282161d396c65bd97dc99dbde644a31610f.