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Heejin Ahn d598826c8d [DAGCombiner] Fix a case of 1 in non-splat vector pow2 divisor 
Summary:
D42479 (rL329525) enabled SDIV combine for pow2 non-splat vector
dividers. But when there is a 1 in a vector, the instruction sequence to
be generated involves shifting a value by the number of its bit widths,
which is undefined
(c64f4dbfe3/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (L6000-L6006)).

Especially, in architectures that do not support vector instructions,
each of element in a vector will be computed separately using scalar
operations, and then the resulting value will be undef for '1' values
in a vector.

(All 1's vector is fine; only vectors mixed with 1 and others will be
affected.)

Reviewers: RKSimon, jgravelle-google

Subscribers: jfb, dschuff, sbc100, jgravelle-google, llvm-commits

Differential Revision: https://reviews.llvm.org/D46161

llvm-svn: 331092
2018-04-27 22:23:11 +00:00
bindings [AggressiveInstCombine] Add aggressive inst combiner to the LLVM C API. 2018-04-24 00:39:29 +00:00
cmake [cmake] Make linker detection take flags into account 2018-04-26 06:04:46 +00:00
docs [docs] add fp-cast-overflow-workaround options to release notes 2018-04-27 16:33:35 +00:00
examples Fix build breaks in examples due to moving stuff from Scalar.h to InstCombine.h 2018-04-24 00:58:57 +00:00
include [FastISel] Fix local value sinking algorithmic complexity 2018-04-27 21:48:51 +00:00
lib [DAGCombiner] Fix a case of 1 in non-splat vector pow2 divisor 2018-04-27 22:23:11 +00:00
projects [cmake] Support moving debuginfo-tests to llvm/projects 2017-12-12 17:06:08 +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] Enable warnings for runtimes 2018-04-27 15:10:50 +00:00
test [DAGCombiner] Fix a case of 1 in non-splat vector pow2 divisor 2018-04-27 22:23:11 +00:00
tools [llvm-objcopy] Add --weaken-symbol (-W) option 2018-04-27 19:16:27 +00:00
unittests [PatternMatch] Stabilize the matching order of commutative matchers 2018-04-27 21:23:20 +00:00
utils [Tablegen] SubtargetEmitter: move the logic that prints predicates for variant scheduling classes to helper functions. NFC 2018-04-26 18:03:24 +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 .clang-tidy: correct style name is 'camelBack' not 'lowerCase'. 2016-09-13 19:04:26 +00:00
.gitattributes [MC] Fix regression tests on Windows when git “core.autocrlf” is set to true. 2017-11-17 21:59:43 +00:00
.gitignore gitignore: Ignore .vs folder (VS2017 config files) 2017-04-08 00:16:58 +00:00
CMakeLists.txt Remove LLVM_INSTALL_CCTOOLS_SYMLINKS 2018-04-24 15:41:02 +00:00
CODE_OWNERS.TXT [CODE_OWNERS] Update my email address. 2018-04-23 19:09:49 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Add myself to CREDITS.txt 2018-01-29 17:02:34 +00:00
LICENSE.TXT Bump year to 2017 in LICENSE.txt 2017-01-12 18:02:42 +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 Test commit access 2017-08-18 02:39:28 +00:00
RELEASE_TESTERS.TXT Update my email addresses, NFC. 2017-10-26 10:16:54 +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.