| commit | 189ce475d34fba2e12a68834e7d4d1c2f2856e7e | [log] [tgz] |
|---|---|---|
| author | Fangrui Song <maskray@google.com> | Wed Aug 21 03:02:08 2019 +0000 |
| committer | Fangrui Song <maskray@google.com> | Wed Aug 21 03:02:08 2019 +0000 |
| tree | 6e049555a54a9961bb2d4465146f3f6a08699fe4 | |
| parent | 9ad08c674b6ad45695f2750a21d1b1dc8698200c [diff] |
[ELF] More dynamic relocation packing Currently, with Android dynamic relocation packing, only relative relocations are grouped together. This patch implements similar packing for non-relative relocations. The implementation groups non-relative relocations with the same r_info and r_addend, if using RELA. By requiring a minimum group size of 3, this achieves smaller relocation sections. Building Android for an ARM32 device, I see the total size of /system/lib decrease by 392 KB. Grouping by r_info also allows the runtime dynamic linker to implement an 1-entry cache to reduce the number of symbol lookup required. With such 1-entry cache implemented on Android, I'm seeing 10% to 20% reduction in total time spent in runtime linker for several executables that I tested. As a simple correctness check, I've also built x86_64 Android and booted successfully. Differential Revision: https://reviews.llvm.org/D66491 Patch by Vic Yang! git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@369488 91177308-0d34-0410-b5e6-96231b3b80d8
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.
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.