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Guozhi Wei acd7d48f71 [SimplifyCFG] Don't do if-conversion if there is a long dependence chain 
If after if-conversion, most of the instructions in this new BB construct a long and slow dependence chain, it may be slower than cmp/branch, even if the branch has a high miss rate, because the control dependence is transformed into data dependence, and control dependence can be speculated, and thus, the second part can execute in parallel with the first part on modern OOO processor.

This patch checks for the long dependence chain, and give up if-conversion if find one.

Differential Revision: https://reviews.llvm.org/D39352

llvm-svn: 321377
2017-12-22 18:54:04 +00:00
bindings Update go bindings to use new functions from rL317135. 2017-11-02 10:22:26 +00:00
cmake [cmake] Fix clang-cl cross-compilation on macOS 2017-12-15 01:05:48 +00:00
docs PR35705: Fix Chapter 9 example code for API changes to DIBuilder 2017-12-20 19:36:54 +00:00
examples PR35705: Fix Chapter 9 example code for API changes to DIBuilder 2017-12-20 19:36:54 +00:00
include [SimplifyCFG] Don't do if-conversion if there is a long dependence chain 2017-12-22 18:54:04 +00:00
lib [SimplifyCFG] Don't do if-conversion if there is a long dependence chain 2017-12-22 18:54:04 +00:00
projects [cmake] Support moving debuginfo-tests to llvm/projects 2017-12-12 17:06:08 +00:00
resources
runtimes [runtimes] Add install-*-stripped targets 2017-12-08 19:42:46 +00:00
test [SimplifyCFG] Don't do if-conversion if there is a long dependence chain 2017-12-22 18:54:04 +00:00
tools [llvm-readobj] Fix ambiguous call to the printNumber 2017-12-21 10:46:20 +00:00
unittests [YAML] Refactor escaping unittests 2017-12-21 17:14:13 +00:00
utils [TableGen] Print more helpful information in case of type contradiction 2017-12-21 17:12:43 +00:00
.arcconfig project_id is from another era in phabricator land and does not provide any value. 2016-09-27 15:47:29 +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] Update experimental target error message 2017-12-18 19:15:15 +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 2017-09-18 14:33:39 +00:00
LICENSE.TXT Bump year to 2017 in LICENSE.txt 2017-01-12 18:02:42 +00:00
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,
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LLVM is open source software. You may freely distribute it under the terms of
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Please see the documentation provided in docs/ for further
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If you are writing a package for LLVM, see docs/Packaging.rst for our
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