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Nikita Popov a01112ce3c [InstCombine] Optimize overflow check base on uadd.with.overflow result 
Fix for https://bugs.llvm.org/show_bug.cgi?id=40846.

This adds a combine for cases where a (a + b) < a style overflow
check is performed, but with a + b being the result of
uadd.with.overflow, so the overflow result is also already available
and we can just use it. Subsequently GVN/CSE will deduplicate the extracts.

We can run into this situation if you have both a uadd.with.overflow
and a manual add + overflow check in the same function (on the same
operands), in which case GVN will rewrite the add to the with.overflow
result and leave you with this pattern.

The implementation is a bit ugly because I'm handling the various
canonicalization edge cases.

This does not yet handle the negated version of this pattern.

Differential Revision: https://reviews.llvm.org/D58644
2019-12-11 20:52:04 +01:00
benchmarks
bindings [llvm][bindings][go] Fix typo 2019-12-03 09:30:32 +01:00
cmake [cmake] Disable GCC 9's -Wredundant-move 2019-12-09 11:01:50 +01:00
docs [TableGen] Add bang-operators !getop and !setop. 2019-12-11 12:05:22 +00:00
examples [ORC] Remove the automagic Main JITDylib fram ExecutionSession. 2019-12-05 01:36:49 -08:00
include Add intrinsics for unary narrowing operations 2019-12-11 18:55:51 +00:00
lib [InstCombine] Optimize overflow check base on uadd.with.overflow result 2019-12-11 20:52:04 +01:00
projects Add few docs and implementation of strcpy and strcat. 2019-10-04 17:30:54 +00:00
resources
runtimes Adding support for overriding LLVM_ENABLE_RUNTIMES for runtimes builds. 2019-09-24 22:38:18 +00:00
test [InstCombine] Optimize overflow check base on uadd.with.overflow result 2019-12-11 20:52:04 +01:00
tools [llvm-readobj][llvm-readelf] - Remove excessive empty lines when reporting errors and warnings. 2019-12-11 15:06:33 +03:00
unittests [VFS] Disable check for ../foo on Windows 2019-12-11 10:53:35 -08:00
utils [TableGen] Remove unused target intrinsic generation logic 2019-12-11 07:38:45 -08:00
.arcconfig
.clang-format
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CMakeLists.txt Revert "[Examples] Add IRTransformations directory to examples." 2019-12-01 22:20:20 +00:00
CODE_OWNERS.TXT
configure
CREDITS.TXT
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
README.txt Test commit. 2019-10-03 14:57:49 +00:00
RELEASE_TESTERS.TXT

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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