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Florian Hahn aaa658ee7c [PatternMatch] Match XOR variant of unsigned-add overflow check. 
Instcombine folds (a + b <u a) to (a ^ -1 <u b) and that does not match
the expected pattern in CodeGenPerpare via UAddWithOverflow.

This causes a regression over Clang 7 on both X86 and AArch64:
https://gcc.godbolt.org/z/juhXYV

This patch extends UAddWithOverflow to also catch the XOR case, if the
XOR is only used in the ICMP. This covers just a single case, but I'd
like to make sure I am not missing anything before tackling the other
cases.

Reviewers: nikic, RKSimon, lebedev.ri, spatel

Reviewed By: nikic, lebedev.ri

Differential Revision: https://reviews.llvm.org/D74228
2020-02-19 15:25:18 +01:00
benchmarks
bindings Rework go bindings so that validation works fine 2020-02-13 14:13:03 +01:00
cmake llvm: Use quotes around MSVC_DIA_SDK_DIR CMake variable 2020-02-18 14:42:19 +02:00
docs Add coding standard recommending use of qualifiers in cpp files 2020-02-18 14:08:56 -08:00
examples Fix compilation breakage introduced by 8404aeb56a73ab24f9b295111de3b37a37f0b841. 2020-02-14 11:17:18 -05:00
include [PatternMatch] Match XOR variant of unsigned-add overflow check. 2020-02-19 15:25:18 +01:00
lib [PatternMatch] Match XOR variant of unsigned-add overflow check. 2020-02-19 15:25:18 +01:00
projects Add few docs and implementation of strcpy and strcat. 2019-10-04 17:30:54 +00:00
resources
runtimes [runtimes] Add umbrella targets for runtimes 2020-02-12 09:46:14 -08:00
test [PatternMatch] Match XOR variant of unsigned-add overflow check. 2020-02-19 15:25:18 +01:00
tools Recommit: "[llvm-exegesis] Improve error reporting in Assembler.cpp" 2020-02-19 14:40:28 +01:00
unittests Recommit: "[llvm-exegesis] Improve error reporting in Assembler.cpp" 2020-02-19 14:40:28 +01:00
utils [TableGen] Diagnose undefined fields when generating searchable tables 2020-02-19 14:03:48 +00:00
.arcconfig
.clang-format
.clang-tidy - Update .clang-tidy to ignore parameters of main like functions for naming violations in clang and llvm directory 2020-01-31 16:49:45 +00:00
.gitattributes Fix the "git modified" issue on the preserve-comments-crlf.s. 2019-09-10 12:17:49 +00:00
.gitignore Continue removing llgo. 2020-02-10 10:33:58 -08:00
CMakeLists.txt Fix integration of pass plugins with llvm dylib 2020-02-13 14:18:08 +01:00
CODE_OWNERS.TXT Continue removing llgo. 2020-02-10 10:33:58 -08:00
configure
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,
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LLVM is open source software. You may freely distribute it under the terms of
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Please see the documentation provided in docs/ for further
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If you are writing a package for LLVM, see docs/Packaging.rst for our
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