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LLVM backend for 6502
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25b7d54e7f
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Chandler Carruth 25b7d54e7f [x86,SDAG] Sink the logic for folding shuffles of splats more 
aggressively from the x86 shuffle lowering to the generic SDAG vector
shuffle formation code.

This code already tried to fold away shuffles of splats! It just had
lots of bugs and couldn't handle the case my new x86 shuffle lowering
needed.

First, it failed to correctly compute whether N2 was undef because it
pre-computed this, then did transformations which could *make* N2 undef,
then failed to ever re-consider the precomputed state.

Second, it didn't look through bitcasts at all, even in the safe cases
where they are just element-type bitcasts with no change to the number
of elements.

Third, it didn't handle all-zero bit casts nicely the way my code in the
x86 side of things did, which is essential to getting good zext-shuffle
lowerings.

But all of these are generic. I just ported the code down to this layer
and fixed the surrounding bugs. Tests exercising this in the x86 backend
still pass and some silly code in widen_cast-6.ll gets better. I updated
that test to be a bit more precise but it's still pretty unclear what
the value of the test is in this day and age.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212517 91177308-0d34-0410-b5e6-96231b3b80d8
2014-07-08 08:45:38 +00:00
autoconf Remove path_tclsh.m4. 2014-06-02 12:54:32 +00:00
bindings [OCaml] Documentation improvements. 2014-07-02 22:17:20 +00:00
cmake [CMake] Introduce LLVM_ENABLE_PLUGINS as an internal option. BUILD_SHARED_LIBS may not control enable/disable plugins. 2014-07-04 04:45:40 +00:00
docs fixed typos 2014-07-04 19:40:43 +00:00
examples Try to fix the msvc build. 2014-04-29 23:37:02 +00:00
include [SDAG] Build up a more rich set of APIs for querying build-vector SDAG 2014-07-08 07:19:55 +00:00
lib [x86,SDAG] Sink the logic for folding shuffles of splats more 2014-07-08 08:45:38 +00:00
projects Remove projects/sample. 2014-03-12 22:40:22 +00:00
test [x86,SDAG] Sink the logic for folding shuffles of splats more 2014-07-08 08:45:38 +00:00
tools Use raw_fd_ostream instead of std::ofstream. 2014-07-07 20:34:51 +00:00
unittests These should be EXPECT_TRUE, not EXPECT_FALSE. Amends r212415. 2014-07-06 20:20:02 +00:00
utils [testing]: lld generally lives in tools/, so fix llvm-lit. 2014-07-07 15:26:53 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.gitignore Add Polly to the ignored trees. 2014-06-25 13:13:36 +00:00
CMakeLists.txt [CMake] Introduce LLVM_SHLIB_OUTPUT_INTDIR. 2014-07-04 04:23:26 +00:00
CODE_OWNERS.TXT ARM Linux support 2014-04-02 23:03:28 +00:00
configure Touch configure to force clang's config.h.in reconfiguration on the build servers 2014-06-06 10:36:38 +00:00
CREDITS.TXT Update Credits. 2014-05-29 19:59:58 +00:00
LICENSE.TXT Remove projects/sample. 2014-03-12 22:40:22 +00:00
llvm.spec.in
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile [configure/make] Propagate names of build host tools when making BuildTools 2014-03-25 21:45:41 +00:00
Makefile.common
Makefile.config.in Add a --enable-clang-plugin-support option to configure. 2014-03-10 16:58:35 +00:00
Makefile.rules [Make] Fix dependencies for td.expanded 2014-06-20 19:00:41 +00:00
README.txt Trivial test commit. 2014-04-26 19:05:45 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

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Please see the documentation provided in docs/ for further
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