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Eli Friedman 75b50e6d60 [GlobalOpt] Fix exponential compile-time with selects. 
If you have a long chain of select instructions created from something
like `int* p = &g; if (foo()) p += 4; if (foo2()) p += 4;` etc., a naive
recursive visitor will recursively visit each select twice, which is
O(2^N) in the number of select instructions. Use the visited set to cut
off recursion in this case.

(No testcase because this doesn't actually change the behavior, just the
time.)

Differential Revision: https://reviews.llvm.org/D42451

llvm-svn: 323910
2018-01-31 20:42:25 +00:00
bindings [NFC] fix trivial typos in comments and documents 2018-01-26 08:15:29 +00:00
cmake [cmake] Don't build Native llvm-config when cross compiling if passed by user. 2018-01-21 00:29:00 +00:00
docs docs: wordsmith some of the linker option extension 2018-01-31 00:16:23 +00:00
examples PR35705: Fix Chapter 9 example code for API changes to DIBuilder 2017-12-20 19:36:54 +00:00
include AMDGPU: Add intrinsics llvm.amdgcn.cvt.{pknorm.i16, pknorm.u16, pk.i16, pk.u16} 2018-01-31 20:18:04 +00:00
lib [GlobalOpt] Fix exponential compile-time with selects. 2018-01-31 20:42:25 +00:00
projects [cmake] Support moving debuginfo-tests to llvm/projects 2017-12-12 17:06:08 +00:00
resources
runtimes [CMake] Support for cross-compilation when build runtimes 2018-01-08 23:50:59 +00:00
test AMDGPU: Fold inline offset for loads properly in moveToVALU on GFX9 2018-01-31 20:18:11 +00:00
tools [WebAssembly] MC: Remove unused code for handling of wasm globals 2018-01-31 19:50:14 +00:00
unittests [globalisel][legalizer] Fix a fallthrough case in the unittests debug printing 2018-01-29 23:47:41 +00:00
utils [utils] De-duplicate utils/update_{llc_,}test_checks.py 2018-01-30 00:40:05 +00:00
.arcconfig [llvm] Set up .arcconfig to point to Diffusion L repository 2018-01-12 15:37:41 +00:00
.clang-format
.clang-tidy
.gitattributes [MC] Fix regression tests on Windows when git “core.autocrlf” is set to true. 2017-11-17 21:59:43 +00:00
.gitignore gitignore: Ignore .vs folder (VS2017 config files) 2017-04-08 00:16:58 +00:00
CMakeLists.txt [CMake] Fix Bug Report URL 2018-01-25 19:16:46 +00:00
CODE_OWNERS.TXT Update my email addresses, NFC. 2017-10-26 10:16:54 +00:00
configure
CREDITS.TXT Add myself to CREDITS.txt 2018-01-29 17:02:34 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
README.txt Test commit access 2017-08-18 02:39:28 +00:00
RELEASE_TESTERS.TXT Update my email addresses, NFC. 2017-10-26 10:16:54 +00:00

README.txt 

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

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.