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Mirror of https://github.com/RPCS3/llvm-mirror
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Sanjay Patel c3aa82cda9 [InstCombine] try harder to form rotate (funnel shift) (PR20750) 
We have a similar match for patterns ending in a truncate. This
should be ok for all targets because the default expansion would
still likely be better from replacing 2 'and' ops with 1.

Attempt to show the logic equivalence in Alive (which doesn't
currently have funnel-shift in its vocabulary AFAICT):

  %shamt = zext i8 %i to i32
  %m = and i32 %shamt, 31
  %neg = sub i32 0, %shamt
  %and4 = and i32 %neg, 31
  %shl = shl i32 %v, %m
  %shr = lshr i32 %v, %and4
  %or = or i32 %shr, %shl
  =>
  %a = and i8 %i, 31
  %shamt2 = zext i8 %a to i32
  %neg2 = sub i32 0, %shamt2
  %and4 = and i32 %neg2, 31
  %shl = shl i32 %v, %shamt2
  %shr = lshr i32 %v, %and4
  %or = or i32 %shr, %shl

https://rise4fun.com/Alive/V9r

llvm-svn: 360605
2019-05-13 17:28:19 +00:00
benchmarks Pull google/benchmark library to the LLVM tree 2018-08-28 09:42:41 +00:00
bindings [OCaml] Update api to account for FNeg and CallBr instructions 2019-04-16 15:00:19 +00:00
cmake [cmake] Remove MSVC C4800 override 2019-05-10 10:22:13 +00:00
docs Add constrained fptrunc and fpext intrinsics. 2019-05-13 13:23:30 +00:00
examples [JITLink] Update BuildingAJIT tutorials to account for API changes in r358818. 2019-04-20 17:35:28 +00:00
include Add constrained fptrunc and fpext intrinsics. 2019-05-13 13:23:30 +00:00
lib [InstCombine] try harder to form rotate (funnel shift) (PR20750) 2019-05-13 17:28:19 +00:00
projects Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
resources
runtimes [CMake] Replace the sanitizer support in runtimes build with multilib 2019-04-22 23:31:39 +00:00
test [InstCombine] try harder to form rotate (funnel shift) (PR20750) 2019-05-13 17:28:19 +00:00
tools Simplify llvm-cat help 2019-05-13 11:29:25 +00:00
unittests FileCheck [5/12]: Introduce regular numeric variables 2019-05-13 12:39:08 +00:00
utils Stop defining negative versions of some lit feature keywords: 2019-05-13 17:18:58 +00:00
.arcconfig [llvm] Set up .arcconfig to point to Diffusion L repository 2018-01-12 15:37:41 +00:00
.clang-format
.clang-tidy Disable tidy checks with too many hits 2019-02-01 11:20:13 +00:00
.gitattributes [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 2018-05-09 02:40:45 +00:00
.gitignore [clangd] Store index in '.clangd/index' instead of '.clangd-index' 2019-02-20 19:08:06 +00:00
CMakeLists.txt build: add option to disable unwind tables 2019-05-02 19:37:26 +00:00
CODE_OWNERS.TXT [llvm-mca] Move llvm-mca library to llvm/lib/MCA. 2018-12-17 08:08:31 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT add Qiu Chaofan (qiucf@cn.ibm.com) to the CREDITS.txt 2019-04-23 02:37:48 +00:00
LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
llvm.spec.in Update structured references to the license to the new license. 2019-01-19 11:30:51 +00:00
LLVMBuild.txt Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
README.txt Testing commit access 2019-02-19 20:38:51 +00:00
RELEASE_TESTERS.TXT Update the list of platforms & archs 2018-12-16 14:47:16 +00:00

README.txt 

The LLVM Compiler Infrastructure
================================

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.