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Jay Foad f21bfff407 [AMDGPU] Use reductions instead of scans in the atomic optimizer 
If the result of an atomic operation is not used then it can be more
efficient to build a reduction across all lanes instead of a scan. Do
this for GFX10, where the permlanex16 instruction makes it viable. For
wave64 this saves a couple of dpp operations. For wave32 it saves one
readlane (which are generally bad for performance) and one dpp
operation.

Differential Revision: https://reviews.llvm.org/D98953
2021-03-26 15:38:14 +00:00
benchmarks
bindings [OCaml] Fix a possible crash in llvm_struct_name 2021-03-26 11:49:13 +00:00
cmake [CMAKE] Fix cross-compilation build 2021-03-23 13:24:08 +03:00
docs [NFC][AMDGPU] Corrections to AMD GPU initial kernel launch documentation 2021-03-26 02:05:45 +00:00
examples [ORC] Fix some comments in the LLJITWithObjectLinkingLayerPlugin example. 2021-03-12 19:13:42 -08:00
include [GlobalISel] Add G_ROTR and G_ROTL opcodes for rotates. 2021-03-25 17:23:30 -07:00
lib [AMDGPU] Use reductions instead of scans in the atomic optimizer 2021-03-26 15:38:14 +00:00
projects llvmbuildectomy - replace llvm-build by plain cmake 2020-11-13 10:35:24 +01:00
resources
runtimes [runtimes] Add the libc project to the list of runtimes. 2021-03-23 17:33:03 +00:00
test [AMDGPU] Use reductions instead of scans in the atomic optimizer 2021-03-26 15:38:14 +00:00
tools [NFC] Reordering parameters in getFile and getFileOrSTDIN 2021-03-25 09:47:49 -04:00
unittests [Triple][Driver] Add muslx32 environment and use /lib/ld-musl-x32.so.1 for -dynamic-linker 2021-03-25 16:25:47 -07:00
utils [NFC] Reordering parameters in getFile and getFileOrSTDIN 2021-03-25 09:47:49 -04:00
.clang-format
.clang-tidy
.gitattributes
.gitignore
CMakeLists.txt [CMAKE] Fix cross-compilation build 2021-03-23 13:24:08 +03:00
CODE_OWNERS.TXT [M68k][CODE_OWNERS](0/8) Add code owner for the M68k target 2021-03-08 12:30:56 -08:00
configure
CREDITS.TXT [NFC] Add contributors names to CREDITS.TXT 2020-10-07 13:22:55 -04:00
LICENSE.TXT
llvm.spec.in
README.txt
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,
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.