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Simon Pilgrim 4cbc84cfa7 [X86][SSE] Allow folding of store/zext with PEXTRW of 0'th element 
Under normal circumstances we prefer the higher performance MOVD to extract the 0'th element of a v8i16 vector instead of PEXTRW.

But as detailed on PR27265, this prevents the SSE41 implementation of PEXTRW from folding the store of the 0'th element. Additionally it prevents us from making use of the fact that the (SSE2) reg-reg version of PEXTRW implicitly zero-extends the i16 element to the i32/i64 destination register.

This patch only preferentially lowers to MOVD if we will not be zero-extending the extracted i16, nor prevent a store from being folded (on SSSE41).

Fix for PR27265.

Differential Revision: https://reviews.llvm.org/D22509

llvm-svn: 276289
2016-07-21 14:54:17 +00:00
bindings [OCaml] Add functions for accessing metadata nodes. 2016-06-22 03:30:24 +00:00
cmake Add AIX support to Path.inc, Host.h, and CMake. 2016-07-19 22:46:39 +00:00
docs [docs] Update release docs 2016-07-21 12:00:50 +00:00
examples [Kaleidoscope][BuildingAJIT] Start filling in text for chapter 3. 2016-07-15 01:39:49 +00:00
include [DenseMap] Add a C++17-style try_emplace method. 2016-07-21 13:37:53 +00:00
lib [X86][SSE] Allow folding of store/zext with PEXTRW of 0'th element 2016-07-21 14:54:17 +00:00
projects
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runtimes [CMake] Add LLVM runtimes directory 2016-06-23 22:07:21 +00:00
test [X86][SSE] Allow folding of store/zext with PEXTRW of 0'th element 2016-07-21 14:54:17 +00:00
tools [profdata] Remove constructor that MSVC 2013 pretends to not understand. 2016-07-21 14:29:11 +00:00
unittests [DenseMap] Add a C++17-style try_emplace method. 2016-07-21 13:37:53 +00:00
utils GlobalISel: Remove explicit enumerator values from .def file. 2016-07-20 22:58:01 +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 [CMake] Add LLVM runtimes directory 2016-06-23 22:07:21 +00:00
CMakeLists.txt Add AIX support to Path.inc, Host.h, and CMake. 2016-07-19 22:46:39 +00:00
CODE_OWNERS.TXT Transfer ownership of the gold plugin. 2016-07-05 20:49:50 +00:00
configure
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
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Low Level Virtual Machine (LLVM)
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