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Michael Kuperstein 2a93bda6e9 [CGP] Be less conservative about tail-duplicating a ret to allow tail calls 
CGP tail-duplicates rets into blocks that end with a call that feed the ret.
This puts the call in tail position, potentially allowing the DAG builder to
lower it as a tail call. To avoid tail duplication in cases where we won't
form the tail call, CGP tried to predict whether this is going to be possible,
and avoids doing it when lowering as a tail call will definitely fail.
However, it was being too conservative by always throwing away calls to
functions with a signext/zeroext attribute on the return type.

Instead, we can use the same logic the builder uses to determine whether the
attributes work out.

Differential Revision: https://reviews.llvm.org/D24315


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280894 91177308-0d34-0410-b5e6-96231b3b80d8
2016-09-08 00:48:37 +00:00
bindings Formatting with clang-format patch r280700 2016-09-06 17:03:02 +00:00
cmake [CMake] Cleanup LLVM_OPTIMIZED_TABLEGEN 2016-09-06 20:27:07 +00:00
docs [CUDA] Rework "optimizations" and "publication" section in CompileCudaWithLLVM.rst. 2016-09-07 21:46:53 +00:00
examples Fix singlton -> singleton typo. 2016-08-26 02:00:21 +00:00
include [CGP] Be less conservative about tail-duplicating a ret to allow tail calls 2016-09-08 00:48:37 +00:00
lib [CGP] Be less conservative about tail-duplicating a ret to allow tail calls 2016-09-08 00:48:37 +00:00
projects
resources
runtimes [CMake] Connecting check-all and test-depends targets correctly 2016-09-01 18:26:01 +00:00
test [CGP] Be less conservative about tail-duplicating a ret to allow tail calls 2016-09-08 00:48:37 +00:00
tools [lib/LTO] Add a way to run a custom pipeline 2016-09-07 17:46:16 +00:00
unittests [CMake] Use CMake's default RPATH for the unit tests 2016-09-07 08:37:15 +00:00
utils [lit] Downgrade error to warning on gtest crashes during discovery. 2016-09-05 20:53:14 +00:00
.arcconfig Upgrade all the .arcconfigs to https. 2016-07-14 13:15:37 +00:00
.clang-format
.clang-tidy Don't use misc-unused-parameters check on LLVM. 2016-04-13 08:58:52 +00:00
.gitignore gitignore: ignore VS Code editor files 2016-09-02 22:54:26 +00:00
CMakeLists.txt Try to fix a circular dependency in the modules build. 2016-09-06 20:16:19 +00:00
CODE_OWNERS.TXT CODE_OWNERS: bring my entry up to date 2016-09-05 17:42:46 +00:00
configure
CREDITS.TXT Shamelessly add myself to CREDITS.TXT 2016-08-04 16:28:22 +00:00
LICENSE.TXT Remove autoconf references from LICENSE.TXT 2016-08-12 20:11:03 +00:00
llvm.spec.in
LLVMBuild.txt
README.txt Revert rL277454 2016-08-02 13:26:07 +00:00
RELEASE_TESTERS.TXT Adding RELEASE_TESTERS.TXT 2016-07-21 16:46:44 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

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.