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Sanjay Patel 219e228d73 [InstSimplify] fold identity shuffles (recursing if needed) 
This patch simplifies the examples from D31509 and D31927 (PR30630) and catches 
the basic identity shuffle tests that Zvi recently added.

I'm not sure if we have something like this in DAGCombiner, but we should?

It's worth noting that "MaxRecurse / RecursionLimit" is only 3 on entry at the moment. 
We might want to bump that up if there are longer shuffle chains like this in the wild.

For now, we're ignoring shuffles that have undef mask elements because it's not
clear how those should be handled.

Differential Revision: https://reviews.llvm.org/D31960

llvm-svn: 300714
2017-04-19 16:48:22 +00:00
bindings Introducing LLVMMetadataRef 2017-04-17 11:52:54 +00:00
cmake Add a linker script to version LLVM symbols 2017-04-17 20:51:50 +00:00
docs PR32382: Fix emitting complex DWARF expressions. 2017-04-18 01:21:53 +00:00
examples Module::getOrInsertFunction is using C-style vararg instead of variadic templates. 2017-04-11 15:01:18 +00:00
include Add an #include for <climits> for CHAR_BIT. 2017-04-19 15:50:43 +00:00
lib [InstSimplify] fold identity shuffles (recursing if needed) 2017-04-19 16:48:22 +00:00
projects [cmake] Include openmp with add_llvm_external_project 2017-03-07 18:54:17 +00:00
resources
runtimes [CMake][runtimes] Use -nodefaultlibs for the runtimes build 2017-04-13 21:29:03 +00:00
test [InstSimplify] fold identity shuffles (recursing if needed) 2017-04-19 16:48:22 +00:00
tools [XRay][tools] Add option to llvm-xray extract to symbolize functions 2017-04-18 23:23:54 +00:00
unittests [Support] Add some helpers to generate bitmasks. 2017-04-19 15:45:31 +00:00
utils build_llvm_package.bat: Move to VS2017 2017-04-13 23:13:23 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitignore gitignore: Ignore .vs folder (VS2017 config files) 2017-04-08 00:16:58 +00:00
CMakeLists.txt Allow suppressing host and target info in VersionPrinter 2017-04-19 00:03:36 +00:00
CODE_OWNERS.TXT CODE_OWNERS: Take code ownership of instruction scheduling. 2017-03-10 18:34:37 +00:00
configure
CREDITS.TXT CODE_OWNERS: Take code ownership of instruction scheduling. 2017-03-10 18:34:37 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
README.txt Test commit. Added a blank line. 2017-03-06 20:45:33 +00:00
RELEASE_TESTERS.TXT Update the release tester for MIPS. NFC. 2017-01-17 11:00:28 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
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