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Florian Hahn 476c0607dd [TargetLower] Update shouldFormOverflowOp check if math is used. 
On some targets, like SPARC, forming overflow ops is only profitable if
the math result is used: https://godbolt.org/z/DxSmdB
This patch adds a new MathUsed parameter to allow the targets
to make the decision and defaults to only allowing it
if the math result is used. That is the conservative choice.

This patch also updates AArch64ISelLowering, X86ISelLowering,
ARMISelLowering.h, SystemZISelLowering.h to allow forming overflow
ops if the math result is not used. On those targets using the
overflow intrinsic for the overflow check only generates better code.

Reviewers: nikic, RKSimon, lebedev.ri, spatel

Reviewed By: lebedev.ri

Differential Revision: https://reviews.llvm.org/D74722
2020-02-19 11:28:33 +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 [TargetLower] Update shouldFormOverflowOp check if math is used. 2020-02-19 11:28:33 +01:00
lib [TargetLower] Update shouldFormOverflowOp check if math is used. 2020-02-19 11:28:33 +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 [TargetLower] Update shouldFormOverflowOp check if math is used. 2020-02-19 11:28:33 +01:00
tools [Coroutines][5/6] Add coroutine passes to pipeline 2020-02-19 00:57:14 -05:00
unittests [LazyCallGraph] Fix ambiguous index value 2020-02-18 23:32:55 -05:00
utils [gn build] Port ca9ba76481f 2020-02-19 00:02:12 +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 Remove autoconf support 2016-01-26 21:29:08 +00:00
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,
optimizers, and runtime environments.

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
assistance with LLVM, and in particular docs/GettingStarted.rst for getting
started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you are writing a package for LLVM, see docs/Packaging.rst for our
suggestions.