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f1a7403e86
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Chandler Carruth f1a7403e86 Fix very poor compile-time in PR19499 due to excessive tree walks in 
domtree. When finding a nearest common dominator, if neither A dominates
B nor B dominates A, we immediately resorted to a tree walk. The tree
walk here is *particularly* expensive because we have to build
a (potentially very large) set for one side's dominators and compare it
with the other side's.

If at any point we have DFS info, we don't need to do any of this. We
can just walk up one side's immediate dominators and return the first
one which dominates the other side. Because of the DFS info, the
dominates queries are trivially constant time.

This reduces the optimizers time in the test case on PR19499 by 70%. It
now optimizes in about 30 seconds for me. And there is still more to be
done for this case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207406 91177308-0d34-0410-b5e6-96231b3b80d8
2014-04-28 09:34:03 +00:00
autoconf ARM64: initial backend import 2014-03-29 10:18:08 +00:00
bindings [python] Fix getting section contents. 2014-04-25 06:25:15 +00:00
cmake If building with LLVM_ENABLE_DOXYGEN and using CMake then 2014-04-28 09:10:05 +00:00
docs Add 'musttail' marker to call instructions 2014-04-24 20:14:34 +00:00
examples Fix warnings about an variable only used in asserts. 2014-03-06 06:35:46 +00:00
include Fix very poor compile-time in PR19499 due to excessive tree walks in 2014-04-28 09:34:03 +00:00
lib [inliner] Significantly improve the compile time in cases like PR19499 2014-04-28 08:52:44 +00:00
projects Remove projects/sample. 2014-03-12 22:40:22 +00:00
test [inliner] Significantly improve the compile time in cases like PR19499 2014-04-28 08:52:44 +00:00
tools [C++] Use 'nullptr'. 2014-04-28 04:05:08 +00:00
unittests [LCG] Re-organize the methods for mutating a call graph to make their 2014-04-27 01:59:50 +00:00
utils llvm-build: Get rid of 'import *' 2014-04-23 19:17:42 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.gitignore Remove projects/sample. 2014-03-12 22:40:22 +00:00
CMakeLists.txt Added Sphinx documentation generation to CMake build system. 2014-04-18 21:45:25 +00:00
CODE_OWNERS.TXT ARM Linux support 2014-04-02 23:03:28 +00:00
configure ARM64: initial backend import 2014-03-29 10:18:08 +00:00
CREDITS.TXT Test commit. 2014-04-10 22:25:51 +00:00
LICENSE.TXT Remove projects/sample. 2014-03-12 22:40:22 +00:00
llvm.spec.in
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile [configure/make] Propagate names of build host tools when making BuildTools 2014-03-25 21:45:41 +00:00
Makefile.common
Makefile.config.in Add a --enable-clang-plugin-support option to configure. 2014-03-10 16:58:35 +00:00
Makefile.rules Use -std=gnu++11 on cygwin and mingw. 2014-03-12 20:01:15 +00:00
README.txt Trivial test commit. 2014-04-26 19:05:45 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

This directory and its subdirectories contain source code for the Low Level
Virtual Machine, 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're writing a package for LLVM, see docs/Packaging.rst for our
suggestions.