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Simon Pilgrim 511d5dc0be [X86][SSE] Optimize the truncation of vector comparison results with PACKSS We currently default to using either generic shuffles or MASK+PACKUS/PACKSS to truncate all integer vectors. For vector comparisons, we know that the result will be either all or zero bits in every element, which can be efficiently truncated by directly using PACKSS to repeatedly halve the size of each element. Due to the limited input values (-1 or 0) we don't need to account for vector element size, so for simplicity we just use the PACKSS(vXi16,vXi16) implementation in all cases. Additionally for AVX2 PACKSS of 256bit data we must perform a PERMQ shuffle to reorder the data into the correct order. I did investigate performing a single shuffle after all the PACKSS calls but the need to cross 128bit lanes makes this difficult to achieve efficiently. We avoid performing this on AVX512 as it should have better alternative truncation instructions. Differential Revision: https://reviews.llvm.org/D22814 llvm-svn: 277132		2016-07-29 10:23:10 +00:00
bindings	[OCaml] Add functions for accessing metadata nodes.	2016-06-22 03:30:24 +00:00
cmake	Add LLVM_ENABLE_LLD option to use LLD as C/C++ linker.	2016-07-29 00:46:13 +00:00
docs	[IR] Introduce a non-integral pointer type	2016-07-28 23:43:38 +00:00
examples	[Kaleidoscope][BuildingAJIT] Start filling in text for chapter 3.	2016-07-15 01:39:49 +00:00
include	TargetInstrInfo: add virtual function getInstSizeInBytes	2016-07-29 08:16:16 +00:00
lib	[X86][SSE] Optimize the truncation of vector comparison results with PACKSS	2016-07-29 10:23:10 +00:00
projects	Remove autoconf support	2016-01-26 21:29:08 +00:00
resources	In MSVC builds embed a VERSIONINFO resource in our exe and DLL files.	2015-06-12 15:58:29 +00:00
runtimes	[CMake] Add LLVM runtimes directory	2016-06-23 22:07:21 +00:00
test	[X86][SSE] Optimize the truncation of vector comparison results with PACKSS	2016-07-29 10:23:10 +00:00
tools	Rework CFG simplification in bugpoint	2016-07-28 22:29:25 +00:00
unittests	Fix some sign compare warnings breaking the -Werror build	2016-07-28 21:42:12 +00:00
utils	build_llvm_package.bat: try tests three times	2016-07-27 20:38:01 +00:00
.arcconfig	Upgrade all the .arcconfigs to https.	2016-07-14 13:15:37 +00:00
.clang-format	Test commit.	2014-03-02 13:08:46 +00:00
.clang-tidy	Don't use misc-unused-parameters check on LLVM.	2016-04-13 08:58:52 +00:00
.gitignore	[CMake] Add LLVM runtimes directory	2016-06-23 22:07:21 +00:00
CMakeLists.txt	Add LLVM_ENABLE_LLD option to use LLD as C/C++ linker.	2016-07-29 00:46:13 +00:00
CODE_OWNERS.TXT	CODE_OWNERS: Take ownership of the MIPS backend	2016-07-23 17:40:48 +00:00
configure	Remove autoconf support	2016-01-26 21:29:08 +00:00
CREDITS.TXT	Update my email address.	2016-05-10 16:23:54 +00:00
LICENSE.TXT	Update copyright year to 2016.	2016-03-30 22:41:06 +00:00
llvm.spec.in	[Sparc] Implement i64 load/store support for 32-bit sparc.	2015-08-10 19:11:39 +00:00
LLVMBuild.txt	Remove the very substantial, largely unmaintained legacy PGO	2013-10-02 15:42:23 +00:00
README.txt	Revert previous test commit.	2016-01-04 19:13:29 +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,
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Please see the documentation provided in docs/ for further
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