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Simon Pilgrim 8e8c2917c1 [X86][SSE] Improve lowering of vXi64 multiply with known zero 32-bit halves 
vXi64 multiplication is lowered into 3 calls of vpmuludq with the upper/lower 32-bit halves.

If any of these halves are zero then we can remove individual calls. Although there was isBuildVectorAllZeros code to do this I don't think it ever worked (maybe just for constant folded cases that don't seem to be tested for any longer).

This requires additional X86ISD support for computeKnownBitsForTargetNode, so far I've just added support for X86ISD::VZEXT (VPMOVZX* - helping the AVX2+ cases).

Partial fix for PR30845

Differential Revision: https://reviews.llvm.org/D26590

llvm-svn: 287223
2016-11-17 12:14:49 +00:00
bindings [OCaml] Adapt to the new attribute C API. 2016-11-12 03:38:30 +00:00
cmake [cmake] Move LLVM_BUILD_STATIC check to an earlier point 2016-11-17 11:22:23 +00:00
docs [CUDA] Update docs to indicate that clang now supports std::complex in CUDA mode. 2016-11-17 01:03:42 +00:00
examples [Orc] Update the BuildingAJIT Chapter 5 server class for the recent RPC changes. 2016-11-11 21:55:25 +00:00
include [Orc] Clang-format the recent RPC update (r286620 and related). 2016-11-17 02:33:47 +00:00
lib [X86][SSE] Improve lowering of vXi64 multiply with known zero 32-bit halves 2016-11-17 12:14:49 +00:00
projects [CMake] Correct configuration order of the sub-projects based on ther dependancies 2016-10-09 20:38:29 +00:00
resources
runtimes [CMake] Make the runtimes directory work with bootstrap builds 2016-10-19 21:50:25 +00:00
test [X86][SSE] Improve lowering of vXi64 multiply with known zero 32-bit halves 2016-11-17 12:14:49 +00:00
tools llvm-dis: Remove dead code. 2016-11-17 00:42:08 +00:00
unittests Remove a stale test case. 2016-11-17 01:02:52 +00:00
utils Fix -Wunused introduced in r286945 for release builds. 2016-11-15 10:13:09 +00:00
.arcconfig project_id is from another era in phabricator land and does not provide any value. 2016-09-27 15:47:29 +00:00
.clang-format
.clang-tidy .clang-tidy: correct style name is 'camelBack' not 'lowerCase'. 2016-09-13 19:04:26 +00:00
.gitignore gitignore: ignore VS Code editor files 2016-09-02 22:54:26 +00:00
CMakeLists.txt [cmake] Move LLVM_BUILD_STATIC check to an earlier point 2016-11-17 11:22:23 +00:00
CODE_OWNERS.TXT CODE_OWNERS: Take ownership of the X86 backend. 2016-11-12 05:16:06 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Give SLP vectorizer credit where it's due. 2016-11-14 19:01:59 +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 Test commit, deleted empty line at the end of README.txt 2016-11-07 18:31:21 +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.