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Sanjay Patel eab9da7e7d [InstCombine] allow undef elements when forming splat from chain of insertelements
We allow forming a splat (broadcast) shuffle, but we were conservatively limiting
that to cases where all elements of the vector are specified. It should be safe
from a codegen perspective to allow undefined lanes of the vector because the
expansion of a splat shuffle would become the chain of inserts again.

Forming splat shuffles can reduce IR and help enable further IR transforms.
Motivating bugs:
https://bugs.llvm.org/show_bug.cgi?id=42174
https://bugs.llvm.org/show_bug.cgi?id=16739

Differential Revision: https://reviews.llvm.org/D63848

llvm-svn: 365147
2019-07-04 16:45:34 +00:00
benchmarks Pull google/benchmark library to the LLVM tree 2018-08-28 09:42:41 +00:00
bindings [IR/DIVar] Add the flag for params that have unmodified value 2019-06-26 11:19:26 +00:00
cmake [cmake] With utils disabled, don't build tblgen in cross mode 2019-07-01 23:15:07 +00:00
docs Document legacy pass manager extension points 2019-07-04 14:03:11 +00:00
examples Add a HowToUseLLJIT example project. 2019-05-22 21:38:41 +00:00
include Fix -Wdocumentation warning. 2019-07-04 10:33:21 +00:00
lib [InstCombine] allow undef elements when forming splat from chain of insertelements 2019-07-04 16:45:34 +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 In MSVC builds embed a VERSIONINFO resource in our exe and DLL files. 2015-06-12 15:58:29 +00:00
runtimes Setup testing target dependencies for default runtimes 2019-06-11 00:25:57 +00:00
test [InstCombine] allow undef elements when forming splat from chain of insertelements 2019-07-04 16:45:34 +00:00
tools llvm-c-test avoid calling malloc(0) 2019-07-04 14:36:34 +00:00
unittests [Remarks] Require an explicit format to the parser 2019-07-04 00:31:03 +00:00
utils [TableGen] Allow DAG isel patterns to override default operands. 2019-07-04 08:43:20 +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 gitignore: Ignore Qt Creator project configuration files. NFC 2019-06-12 08:28:31 +00:00
CMakeLists.txt build: extract LLVM distribution target handling 2019-06-14 18:28:57 +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 [test commit] Add my name to the CREDITS.TXT 2019-05-27 07:48:28 +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

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