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477f28c48d
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Chandler Carruth 477f28c48d [x86] Fix PR20540 where the x86 shuffle DAG combiner had completely 
broken logic for merging shuffle masks in the face of SM_SentinelZero
mask operands.

While these are '-1' they don't mean 'undef' the way '-1' means in the
pre-legalized shuffle masks. Instead, they mean that the shuffle
operation is forcibly zeroing that lane. Reflect this and explicitly
handle it in a bunch of places. In one place the effect is equivalent
but much more clear. In the rest it was really weirdly broken.

Also, rewrite the entire merging thing to be a more directy operation
with a single loop and just doing math to map the indices through the
various masks.

Also add a bunch of asserts to try to make in extremely clear what the
different masks can possibly look like.

Finally, add some comments to clarify that we're merging shuffle masks
*up* here rather than *down* as we do everywhere else, and thus the
logic is quite confusing.

Thanks to several different people for sending test cases, and for
Robert Khasanov for an initial attempt at fixing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215687 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-15 02:43:18 +00:00
autoconf Delete support for AuroraUX. 2014-08-14 15:15:09 +00:00
bindings [OCaml] Expose Llvm.get_operand_use. 2014-08-12 02:55:45 +00:00
cmake Make message about building sphinx documentation with CMake more 2014-08-14 11:57:16 +00:00
docs Delete support for AuroraUX. 2014-08-14 15:15:09 +00:00
examples Temporarily Revert "Nuke the old JIT." as it's not quite ready to 2014-08-07 22:02:54 +00:00
include Revert several FastISel commits to track down a buildbot error. 2014-08-14 19:56:28 +00:00
lib [x86] Fix PR20540 where the x86 shuffle DAG combiner had completely 2014-08-15 02:43:18 +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] Fix PR20540 where the x86 shuffle DAG combiner had completely 2014-08-15 02:43:18 +00:00
tools Silencing some -Wcast-qual warnings and removing some C-style casts at the same time. NFC. 2014-08-14 13:53:19 +00:00
unittests Simplify memory ownership with std::unique_ptr. 2014-08-13 18:59:01 +00:00
utils Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
.arcconfig
.clang-format
.gitignore Add Polly to the ignored trees. 2014-06-25 13:13:36 +00:00
CMakeLists.txt Fix building with in-tree libc++abi on FreeBSD 2014-08-01 19:23:15 +00:00
CODE_OWNERS.TXT Add a sentence that all entries should include an email address. 2014-08-04 19:33:25 +00:00
configure Delete support for AuroraUX. 2014-08-14 15:15:09 +00:00
CREDITS.TXT Test commit access 2014-08-09 16:05:23 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in Track clang r213171 2014-07-16 16:50:34 +00:00
Makefile.rules Delete support for AuroraUX. 2014-08-14 15:15:09 +00:00
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