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Zvi Rackover 42694a3a7e [X86] Prefer reduced width multiplication over pmulld on Silvermont 
Summary:
Prefer expansions such as: pmullw,pmulhw,unpacklwd,unpackhwd over pmulld.
On Silvermont [source: Optimization Reference Manual]:
PMULLD has a throughput of 1/11 [instruction/cycles].
PMULHUW/PMULHW/PMULLW have a throughput of 1/2 [instruction/cycles].

Fixes pr31202.

Analysis of this issue was done by Fahana Aleen.

Reviewers: wmi, delena, mkuper

Subscribers: RKSimon, llvm-commits

Differential Revision: https://reviews.llvm.org/D27203

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288844 91177308-0d34-0410-b5e6-96231b3b80d8
2016-12-06 19:35:20 +00:00
bindings Fix go binding to adapt the new attribute API 2016-11-18 10:11:02 +00:00
cmake [CMake] Fixing clang standalone build 2016-12-06 17:09:29 +00:00
docs [doc] Add .arcconfig setup to the "how to work with a monorepo" section 2016-12-03 01:04:40 +00:00
examples ExceptionDemo: remove some undefined behaviour 2016-11-20 02:36:38 +00:00
include GlobalISel: allow G_SELECT instructions for pointers. 2016-12-06 18:38:34 +00:00
lib [X86] Prefer reduced width multiplication over pmulld on Silvermont 2016-12-06 19:35:20 +00:00
projects [CMake] Correct configuration order of the sub-projects based on ther dependancies 2016-10-09 20:38:29 +00:00
resources
runtimes [CMake] Make the runtimes directory work with bootstrap builds 2016-10-19 21:50:25 +00:00
test [X86] Prefer reduced width multiplication over pmulld on Silvermont 2016-12-06 19:35:20 +00:00
tools [llvm-readobj] - Teach readobj to print PT_OPENBSD_BOOTDATA header 2016-12-06 17:55:52 +00:00
unittests Refactor TargetParserTests. 2016-12-06 02:22:08 +00:00
utils Summary: Currently there is no way to disable deprecated warning from asm like this 2016-12-05 23:55:13 +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 .clang-tidy: correct style name is 'camelBack' not 'lowerCase'. 2016-09-13 19:04:26 +00:00
.gitignore
CMakeLists.txt [CMake] Fixing clang standalone build 2016-12-06 17:09:29 +00:00
CODE_OWNERS.TXT CODE_OWNERS: Take ownership of IR Linker as discussed on llvm-dev 2016-12-02 14:06:53 +00:00
configure
CREDITS.TXT Test Commit, removing a blank line in CREDITS.TXT 2016-11-24 15:40:19 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
README.txt Test commit, deleted empty line at the end of README.txt 2016-11-07 18:31:21 +00:00
RELEASE_TESTERS.TXT

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.