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2ca896a175
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Sanjay Patel 2ca896a175 [x86][SSE/AVX] optimize pcmp results better (PR28484) 
We know that pcmp produces all-ones/all-zeros bitmasks, so we can use that behavior to avoid unnecessary constant loading.

One could argue that load+and is actually a better solution for some CPUs (Intel big cores) because shifts don't have the
same throughput potential as load+and on those cores, but that should be handled as a CPU-specific later transformation if
it ever comes up. Removing the load is the more general x86 optimization. Note that the uneven usage of vpbroadcast in the
test cases is filed as PR28505:
https://llvm.org/bugs/show_bug.cgi?id=28505

Differential Revision: http://reviews.llvm.org/D22225



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@275276 91177308-0d34-0410-b5e6-96231b3b80d8
2016-07-13 16:04:07 +00:00
bindings [OCaml] Add functions for accessing metadata nodes. 2016-06-22 03:30:24 +00:00
cmake [cmake] Create the LLVM_BUILD_UTILS option. 2016-07-10 02:43:47 +00:00
docs fix incorrect xref in sphinx doc 2016-07-13 06:10:37 +00:00
examples New Kaleidoscope chapter: Creating object files 2016-07-02 17:01:59 +00:00
include [BFI] Add new LazyBFI analysis pass 2016-07-13 05:01:48 +00:00
lib [x86][SSE/AVX] optimize pcmp results better (PR28484) 2016-07-13 16:04:07 +00:00
projects Remove autoconf support 2016-01-26 21:29:08 +00:00
resources In MSVC builds embed a VERSIONINFO resource in our exe and DLL files. 2015-06-12 15:58:29 +00:00
runtimes [CMake] Add LLVM runtimes directory 2016-06-23 22:07:21 +00:00
test [x86][SSE/AVX] optimize pcmp results better (PR28484) 2016-07-13 16:04:07 +00:00
tools Rename llc's -fpreserve-as-comments flag -preserve-as-comments. 2016-07-13 14:20:41 +00:00
unittests [llvm-pdbdump] Propagate errors a little more consistently 2016-07-10 03:34:47 +00:00
utils vim: separate the keywords into one per line 2016-07-13 03:47:58 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.clang-tidy Don't use misc-unused-parameters check on LLVM. 2016-04-13 08:58:52 +00:00
.gitignore [CMake] Add LLVM runtimes directory 2016-06-23 22:07:21 +00:00
CMakeLists.txt [cmake] Create the LLVM_BUILD_UTILS option. 2016-07-10 02:43:47 +00:00
CODE_OWNERS.TXT Transfer ownership of the gold plugin. 2016-07-05 20:49:50 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Update my email address. 2016-05-10 16:23:54 +00:00
LICENSE.TXT Update copyright year to 2016. 2016-03-30 22:41:06 +00:00
llvm.spec.in [Sparc] Implement i64 load/store support for 32-bit sparc. 2015-08-10 19:11:39 +00:00
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
README.txt Revert previous test commit. 2016-01-04 19:13:29 +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.