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Simon Pilgrim 75121ab2d6 [SelectionDAG] Optimization of BITREVERSE legalization for power-of-2 integer scalar/vector types 
An extension of D19978, this patch replaces the default BITREVERSE evaluation of individual bit masks+shifts with block mask+shifts when we have integer elements of power-of-2 bits in size.

After calling BSWAP to reverse the order of the constituent bytes (which typically follows a similar approach), every neighbouring 4-bits, 2-bits and finally 1-bit pairs are masked off and swapped over with shifts.

In doing so we can significantly reduce the number of operations required.

Differential Revision: https://reviews.llvm.org/D21578

llvm-svn: 276432
2016-07-22 16:46:25 +00:00
bindings [OCaml] Add functions for accessing metadata nodes. 2016-06-22 03:30:24 +00:00
cmake Add AIX support to Path.inc, Host.h, and CMake. 2016-07-19 22:46:39 +00:00
docs [docs] Move GitHub to GitHubSubMod 2016-07-21 19:52:27 +00:00
examples [Kaleidoscope][BuildingAJIT] Start filling in text for chapter 3. 2016-07-15 01:39:49 +00:00
include [Profile] Cleanup: remove unused interface 2016-07-22 16:11:56 +00:00
lib [SelectionDAG] Optimization of BITREVERSE legalization for power-of-2 integer scalar/vector types 2016-07-22 16:46:25 +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 [SelectionDAG] Optimization of BITREVERSE legalization for power-of-2 integer scalar/vector types 2016-07-22 16:46:25 +00:00
tools [pdb] Round-trip module & file info to/from YAML. 2016-07-22 15:46:37 +00:00
unittests [Support] Make ErrorAsOutParameter take an Error* rather than an Error&. 2016-07-22 16:11:25 +00:00
utils [lit] Use full config path in diagnostics. 2016-07-21 23:20:41 +00:00
.arcconfig Upgrade all the .arcconfigs to https. 2016-07-14 13:15:37 +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] Move the including of utils/unittests under LLVM_INCLUDE_UTILS instead of LLVM_INCLUDE_TESTS. 2016-07-21 21:35:23 +00:00
CODE_OWNERS.TXT Transfer ownership of the XCore backend. 2016-07-21 19:20:57 +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
README.txt Revert previous test commit. 2016-01-04 19:13:29 +00:00
RELEASE_TESTERS.TXT Adding RELEASE_TESTERS.TXT 2016-07-21 16:46:44 +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.