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26e46f2283
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Diego Novillo 26e46f2283 Allow 0-weight branches in BranchProbabilityInfo. 
Summary:
When computing branch weights in BPI, we used to disallow branches with
weight 0. This is a minor nuisance, because a branch with weight 0 is
different to "don't have information". In the context of
instrumentation, it may mean "never executed", in the context of
sampling, it means "never or seldom executed".

In allowing 0 weight branches, I ran into issues with the switch
expansion code in selection DAG. It is currently hardwired to not handle
branches with weight 0. To maintain the current behaviour, I changed it
to use 1 when it finds 0, but perhaps the algorithm needs changes to
tolerate branches with weight zero.

Reviewers: hansw

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D9533

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236617 91177308-0d34-0410-b5e6-96231b3b80d8
2015-05-06 17:55:11 +00:00
autoconf Deprecate in-source autotools builds 2015-05-04 02:04:54 +00:00
bindings IR: Give 'DI' prefix to debug info metadata 2015-04-29 16:38:44 +00:00
cmake [CMake] Also search for prefixed versions of ld.gold 2015-05-01 11:58:30 +00:00
docs Document some of the options in test/lit.cfg 2015-05-04 21:37:00 +00:00
examples [Orc] Reapply r236465 with fixes for the MSVC bots. 2015-05-05 17:37:18 +00:00
include Add missing dereferenceable_or_null getters 2015-05-06 17:41:54 +00:00
lib Allow 0-weight branches in BranchProbabilityInfo. 2015-05-06 17:55:11 +00:00
projects build: make libunwind a proper project 2015-04-25 01:47:39 +00:00
test Allow 0-weight branches in BranchProbabilityInfo. 2015-05-06 17:55:11 +00:00
tools [Orc] Reapply r236465 with fixes for the MSVC bots. 2015-05-05 17:37:18 +00:00
unittests Add bitcode test to verify functions can be materialized out of order. 2015-05-06 16:52:35 +00:00
utils Vim: Fix some bugs in llvm indent plugin. 2015-05-04 21:41:25 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitignore
CMakeLists.txt [CMake] Updates to llvm-shlib to support overriding exports list and added an option to export all symbols. 2015-04-13 21:29:46 +00:00
CODE_OWNERS.TXT Added Andrey Churbanov as the owner of the OpenMP runtime library code 2015-05-05 20:17:53 +00:00
configure Deprecate in-source autotools builds 2015-05-04 02:04:54 +00:00
CREDITS.TXT
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in Deprecate in-source autotools builds 2015-05-04 02:04:54 +00:00
Makefile.rules
README.txt Revert test commit at revision 233535. 2015-03-30 12:39:03 +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're writing a package for LLVM, see docs/Packaging.rst for our
suggestions.