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7bd6e166d9
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Roman Lebedev 7bd6e166d9 [ConstantRange] makeGuaranteedNoWrapRegion(): shl support 
Summary:
If all the shifts amount are already poison-producing,
then we can add more poison-producing flags ontop:
https://rise4fun.com/Alive/Ocwi

Otherwise, we should only consider the possible range of shift amts that don't result in poison.

For unsigned range not not overflow, we must not shift out any set bits,
and the actual limit for `x` can be computed by backtransforming
the maximal value we could ever get out of the `shl` - `-1` through
`lshr`. If the `x` is any larger than that then it will overflow.

Likewise for signed range, but just in signed domain..

This is based on the general idea outlined by @nikic in https://reviews.llvm.org/D68672#1714990

Reviewers: nikic, sanjoy

Reviewed By: nikic

Subscribers: hiraditya, llvm-commits, nikic

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D69217

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375370 91177308-0d34-0410-b5e6-96231b3b80d8
2019-10-20 19:36:55 +00:00
benchmarks Pull google/benchmark library to the LLVM tree 2018-08-28 09:42:41 +00:00
bindings Reapply r374743 with a fix for the ocaml binding 2019-10-14 16:15:14 +00:00
cmake [cmake] Pass external project source directories to sub-configures 2019-10-17 19:24:58 +00:00
docs Explicit in the doc the current list of projects (with easy copy and paste) 2019-10-19 09:55:24 +00:00
examples [examples] Fix some comments in the LLJITWithJITLink example 2019-10-18 18:35:02 +00:00
include [yaml2obj][obj2yaml] - Do not create a symbol table by default. 2019-10-20 14:47:17 +00:00
lib [ConstantRange] makeGuaranteedNoWrapRegion(): shl support 2019-10-20 19:36:55 +00:00
projects Add few docs and implementation of strcpy and strcat. 2019-10-04 17:30:54 +00:00
resources
runtimes Adding support for overriding LLVM_ENABLE_RUNTIMES for runtimes builds. 2019-09-24 22:38:18 +00:00
test AMDGPU: Increase vcc liveness scan threshold 2019-10-20 17:44:17 +00:00
tools [yaml2obj][obj2yaml] - Do not create a symbol table by default. 2019-10-20 14:47:17 +00:00
unittests [ConstantRange] makeGuaranteedNoWrapRegion(): shl support 2019-10-20 19:36:55 +00:00
utils gn build: Build compiler-rt code with -fvisibility=hidden. 2019-10-18 22:52:17 +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 Fix the "git modified" issue on the preserve-comments-crlf.s. 2019-09-10 12:17:49 +00:00
.gitignore gitignore: Ignore Qt Creator project configuration files. NFC 2019-06-12 08:28:31 +00:00
CMakeLists.txt Add few docs and implementation of strcpy and strcat. 2019-10-04 17:30:54 +00:00
CODE_OWNERS.TXT Update email address in CODE_OWNERS 2019-07-01 16:01:15 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Update email address. 2019-07-17 07:02:02 +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 Test commit. 2019-10-03 14:57:49 +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.