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Roman Lebedev c7d0aba459 [InstCombine] Inefficient pattern for high-bits checking 3 (PR38708) 
Summary:
It is sometimes important to check that some newly-computed value
is non-negative and only n bits wide (where n is a variable.)
There are many ways to check that:
https://godbolt.org/z/o4RB8D
The last variant seems best?
(I'm sure there are some other variations i haven't thought of..)

The last (as far i know?) pattern, non-canonical due to the extra use.
https://godbolt.org/z/aCMsPk
https://rise4fun.com/Alive/I6f

https://bugs.llvm.org/show_bug.cgi?id=38708

Reviewers: spatel, craig.topper, RKSimon

Reviewed By: spatel

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D52062

llvm-svn: 342321
2018-09-15 12:04:13 +00:00
benchmarks Pull google/benchmark library to the LLVM tree 2018-08-28 09:42:41 +00:00
bindings [bindings/go] Add DebugLoc parameter to InsertXXXAtEnd() 2018-09-13 21:16:39 +00:00
cmake Test commit access 2018-09-14 19:43:11 +00:00
docs Add flag to llvm-profdata to allow symbols in profile data to be remapped, and 2018-09-13 20:22:02 +00:00
examples [ORC] Update JITCompileCallbackManager to support multi-threaded code. 2018-05-30 01:57:45 +00:00
include [PDB] Make the pretty dumper output modified types. 2018-09-14 22:29:19 +00:00
lib [InstCombine] Inefficient pattern for high-bits checking 3 (PR38708) 2018-09-15 12:04:13 +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 Revert "[CMake] Pass Clang defaults to runtimes builds" 2018-07-13 20:01:55 +00:00
test [InstCombine] Inefficient pattern for high-bits checking 3 (PR38708) 2018-09-15 12:04:13 +00:00
tools [PDB] Make the pretty dumper output modified types. 2018-09-14 22:29:19 +00:00
unittests Fix filesystem race issue in SampleProfTest introduced in rL342283. 2018-09-15 00:04:15 +00:00
utils Fix lit/example/many-tests pickling issue 2018-09-14 19:44:09 +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 [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 2018-05-09 02:40:45 +00:00
.gitignore gitignore: Ignore .vs folder (VS2017 config files) 2017-04-08 00:16:58 +00:00
CMakeLists.txt [benchmark] Re-enable benchmarks on all platforms including Windows 2018-09-07 21:47:00 +00:00
CODE_OWNERS.TXT Add owner for llvm-objcopy 2018-08-09 22:05:19 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Update my information in the CREDITS file. 2018-06-15 20:02:11 +00:00
LICENSE.TXT Update copyright year to 2018. 2018-06-18 12:22:17 +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: remove a blank line 2018-06-08 21:21:55 +00:00
RELEASE_TESTERS.TXT Remove myself from the release testers list. (NFC) 2018-06-20 21:25:50 +00:00

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