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Hongtao Yu d0f29b816e [CSSPGO] Deduplicating dangling pseudo probes. 
Same dangling probes are redundant since they all have the same semantic that is to rely on the counts inference tool to get reasonable count for the same original block. Therefore, there's no need to keep multiple copies of them. I've seen jump threading created tons of redundant dangling probes that slowed down the compiler dramatically. Other optimization passes can also result in redundant probes though without an observed impact so far.

This change removes block-wise redundant dangling probes specifically introduced by jump threading. To support removing redundant dangling probes caused by all other passes, a final function-wise deduplication is also added.

An 18% size win of the .pseudo_probe section was seen for SPEC2017. No performance difference was observed.

Differential Revision: https://reviews.llvm.org/D97482
2021-03-03 22:44:42 -08:00
benchmarks
bindings [Go] Fix bindings/go/llvm/IRBindings.cpp 2020-12-16 10:09:58 -08:00
cmake [PR48898][CMake] Support MinGW Toolchain tool sin llvm_ExternalProject_Add 2021-03-02 22:45:05 +01:00
docs [Docs] Remove no-aa from the alias analysis documentation 2021-03-04 00:35:52 -06:00
examples [Draft] [examples] Move llvm/examples/OCaml-Kaleidoscope/ to llvm-archive 2021-02-11 06:52:24 +05:30
include [CSSPGO] Deduplicating dangling pseudo probes. 2021-03-03 22:44:42 -08:00
lib [CSSPGO] Deduplicating dangling pseudo probes. 2021-03-03 22:44:42 -08:00
projects llvmbuildectomy - replace llvm-build by plain cmake 2020-11-13 10:35:24 +01:00
resources
runtimes [PR48898][CMake] Support MinGW Toolchain tool sin llvm_ExternalProject_Add 2021-03-02 22:45:05 +01:00
test [CSSPGO] Deduplicating dangling pseudo probes. 2021-03-03 22:44:42 -08:00
tools [lli] Add JITLink link component after 99a6d003edbe 2021-03-03 23:14:26 +01:00
unittests [AMDGPU] Rename amdgcn_wwm to amdgcn_strict_wwm 2021-03-03 09:33:57 +01:00
utils Revert "hack to unbreak check-llvm on win after D97335" in attempt for actual fix 2021-03-03 22:35:36 +01:00
.clang-format
.clang-tidy - Update .clang-tidy to ignore parameters of main like functions for naming violations in clang and llvm directory 2020-01-31 16:49:45 +00:00
.gitattributes Fix the "git modified" issue on the preserve-comments-crlf.s. 2019-09-10 12:17:49 +00:00
.gitignore [clangd] Store index in '.cache/clangd/index' instead of '.clangd/index' 2020-07-07 14:53:45 +02:00
CMakeLists.txt [cmake] Move check for libproc to config-ix.cmake 2021-02-18 10:54:27 +01:00
CODE_OWNERS.TXT Change XCore code owner. 2021-01-14 12:13:48 +00:00
configure
CREDITS.TXT [NFC] Add contributors names to CREDITS.TXT 2020-10-07 13:22:55 -04:00
LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
llvm.spec.in Update structured references to the license to the new license. 2019-01-19 11:30:51 +00:00
README.txt Test commit. 2020-03-14 18:08:26 -07:00
RELEASE_TESTERS.TXT Update the list of platforms & archs 2018-12-16 14:47:16 +00:00

README.txt 

The LLVM Compiler Infrastructure
================================

This directory and its subdirectories contain source code for LLVM,
a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments.

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

Please see the documentation provided in docs/ for further
assistance with LLVM, and in particular docs/GettingStarted.rst for getting
started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you are writing a package for LLVM, see docs/Packaging.rst for our
suggestions.