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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 Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT Update for a new year. 2015-03-12 01:25:29 +00:00
llvm.spec.in
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
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 

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