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LLVM backend for 6502
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a6cc351c5b
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Chandler Carruth a6cc351c5b [x86] Teach the new vector shuffle lowering to use 'punpcklwd' and 
'punpckhwd' instructions when suitable rather than falling back to the
generic algorithm.

While we could canonicalize to these patterns late in the process, that
wouldn't help when the freedom to use them is only visible during
initial lowering when undef lanes are well understood. This, it turns
out, is very important for matching the shuffle patterns that are used
to lower sign extension. Fixes a small but relevant regression in
gcc-loops with the new lowering.

When I changed this I noticed that several 'pshufd' lowerings became
unpck variants. This is bad because it removes the ability to freely
copy in the same instruction. I've adjusted the widening test to handle
undef lanes correctly and now those will correctly continue to use
'pshufd' to lower. However, this caused a bunch of churn in the test
cases. No functional change, just churn.

Both of these changes are part of addressing a general weakness in the
new lowering -- it doesn't sufficiently leverage undef lanes. I've at
least a couple of patches that will help there at least in an academic
sense.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217752 91177308-0d34-0410-b5e6-96231b3b80d8
2014-09-15 09:02:37 +00:00
autoconf Delete support for AuroraUX. 2014-08-14 15:15:09 +00:00
bindings Reinstate "Nuke the old JIT." 2014-09-02 22:28:02 +00:00
cmake Add CMake check for libatomic. 2014-09-12 11:08:59 +00:00
docs [docs] Mention character array constants in docs/LangRef.rst 2014-09-11 12:02:59 +00:00
examples Add doInitialization/doFinalization to DataLayoutPass. 2014-09-10 21:27:43 +00:00
include Move replaceAllUsesWith() from DIType to DIDescriptor. 2014-09-15 07:50:36 +00:00
lib [x86] Teach the new vector shuffle lowering to use 'punpcklwd' and 2014-09-15 09:02:37 +00:00
projects [cmake] Use the external project machinery for libcxxabi so that it can 2014-07-25 10:27:40 +00:00
test [x86] Teach the new vector shuffle lowering to use 'punpcklwd' and 2014-09-15 09:02:37 +00:00
tools llvm-cov: Clean up some redundancy in the view API (NFC) 2014-09-15 03:41:04 +00:00
unittests Support: Use llvm::COFF::BigObjMagic 2014-09-11 22:34:32 +00:00
utils [lit] Parse all strings as UTF-8 rather than ASCII. 2014-09-12 16:46:05 +00:00
.arcconfig
.clang-format
.clang-tidy Add .clang-tidy configuration file to provide LLVM-optimized defaults for 2014-09-08 13:30:00 +00:00
.gitignore
CMakeLists.txt Enabling LLVM & Clang to be cross-compiled using CMake from a single configuration command line 2014-09-03 23:21:18 +00:00
CODE_OWNERS.TXT Add Tom Stellard's role as 3.5 release manager. 2014-09-12 08:07:31 +00:00
configure Delete support for AuroraUX. 2014-08-14 15:15:09 +00:00
CREDITS.TXT Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in
Makefile.rules Reinstate "Nuke the old JIT." 2014-09-02 22:28:02 +00:00
README.txt

README.txt 

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