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LLVM backend for 6502
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04402a6c13
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Chandler Carruth 04402a6c13 [x86] Undo a flawed transform I added to form UNPCK instructions when 
AVX is available, and generally tidy up things surrounding UNPCK
formation.

Originally, I was thinking that the only advantage of PSHUFD over UNPCK
instruction variants was its free copy, and otherwise we should use the
shorter encoding UNPCK instructions. This isn't right though, there is
a larger advantage of being able to fold a load into the operand of
a PSHUFD. For UNPCK, the operand *must* be in a register so it can be
the second input.

This removes the UNPCK formation in the target-specific DAG combine for
v4i32 shuffles. It also lifts the v8 and v16 cases out of the
AVX-specific check as they are potentially replacing multiple
instructions with a single instruction and so should always be valuable.
The floating point checks are simplified accordingly.

This also adjusts the formation of PSHUFD instructions to attempt to
match the shuffle mask to one which would fit an UNPCK instruction
variant. This was originally motivated to allow it to match the UNPCK
instructions in the combiner, but clearly won't now.

Eventually, we should add a MachineCombiner pass that can form UNPCK
instructions post-RA when the operand is known to be in a register and
thus there is no loss.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217755 91177308-0d34-0410-b5e6-96231b3b80d8
2014-09-15 10:35:41 +00:00
autoconf
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] Undo a flawed transform I added to form UNPCK instructions when 2014-09-15 10:35:41 +00:00
projects
test [x86] Undo a flawed transform I added to form UNPCK instructions when 2014-09-15 10:35:41 +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
CREDITS.TXT
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

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