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LLVM backend for 6502
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Chandler Carruth 927a5f45e0 [x86] Don't form overly fragmented blends when splitting and 
re-combining shuffles because nothing was available in the wider vector
type.

The key observation (which I've put in the comments for future
maintainers) is that at this point, no further combining is really
possible. And so even though these shuffles trivially could be combined,
we need to actually do that as we produce them when producing them this
late in the lowering.

This fixes another (huge) part of the Halide vector shuffle regressions.
As it happens, this was already well covered by the tests, but I hadn't
noticed how bad some of these got. The specific patterns that turn
directly into unpckl/h patterns were occurring *many* times in common
vector processing code.

There are still more problems here sadly, but trying to incrementally
tease them apart and it looks like this is the core of the problem in
the splitting logic.

There is some chance of regression here, you can see it in the test
changes. Specifically, where we stop forming pshufb in some cases, it is
possible that pshufb was in fact faster. Intel "says" that pshufb is
slower than the instruction sequences replacing it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221852 91177308-0d34-0410-b5e6-96231b3b80d8
2014-11-13 02:42:08 +00:00
autoconf Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
bindings [OCaml] Fix mismatched CAMLparam/CAMLreturn. 2014-11-03 11:47:14 +00:00
cmake Pass PRIVATE to target_link_libraries if using shared libraries. 2014-11-07 15:33:56 +00:00
docs configure.ac lives in autoconf/, not autotools/ 2014-11-10 22:36:04 +00:00
examples [CMake] llvm/examples: Update libdeps for unoptimized builds. 2014-10-31 15:27:16 +00:00
include CMake: stop setting (well, #undef'ing) HOST_LINK_VERSION; it's used in Clang, not LLVM 2014-11-13 00:51:12 +00:00
lib [x86] Don't form overly fragmented blends when splitting and 2014-11-13 02:42:08 +00:00
projects
test [x86] Don't form overly fragmented blends when splitting and 2014-11-13 02:42:08 +00:00
tools Revert "[dwarfdump] Add support for dumping accelerator tables." 2014-11-13 00:15:15 +00:00
unittests Drop a few unneeded ctor calls (missed code review comment). 2014-11-13 00:36:34 +00:00
utils Make TreePattern::error use Twine 2014-11-11 23:48:11 +00:00
.arcconfig
.clang-format
.clang-tidy Enable display of compiler diagnostics in clang-tidy by default. 2014-10-29 17:29:38 +00:00
.gitignore Initial version of Go bindings. 2014-10-16 22:48:02 +00:00
CMakeLists.txt Pass PRIVATE to target_link_libraries if using shared libraries. 2014-11-07 15:33:56 +00:00
CODE_OWNERS.TXT
configure Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
CREDITS.TXT
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
Makefile.rules Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
README.txt

README.txt 

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