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Chandler Carruth 2fe75b3a73 [shuffle] Stand back! I'm about to (try to) do math! 
Especially with blends and large tree heights there was a problem with
the fuzzer where it would end up with enough undef shuffle elements in
enough parts of the tree that in a birthday-attack kind of way we ended
up regularly having large numbers of undef elements in the result. I was
seeing reasonably frequent cases of *all* results being undef which
prevents us from doing any correctness checking at all. While having
undef lanes is important, this was too much.

So I've tried to apply some math to the probabilities of having an undef
lane and balance them against the tree height. Please be gentle, I'm
really terrible at math. I probably made a bunch of amateur mistakes
here. Fixes, etc. are quite welcome. =D At least in running it some, it
seems to be producing more interesting (for correctness testing)
results.

llvm-svn: 215540
 		2014-08-13 12:27:18 +00:00
..
autoconf [autoconf] Fixup s/3.5/3.6/. Clang's ident was 3.5.0svn in autoconf build. 2014-07-29 08:35:03 +00:00
bindings [OCaml] Expose Llvm.get_operand_use. 2014-08-12 02:55:45 +00:00
cmake Fix for #20408 - CMake LLVM_ENABLE_FFI=ON build fails on reconfigure 2014-08-08 14:32:56 +00:00
docs Fix examples of "named metadata" (some of which isn't named). 2014-08-13 04:54:05 +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 [SKX] Extended non-temporal load/store instructions for AVX512VL subsets. 2014-08-13 10:46:00 +00:00
lib [optnone] Make the optnone attribute effective at suppressing function 2014-08-13 10:49:33 +00:00
projects [cmake] Use the external project machinery for libcxxabi so that it can 2014-07-25 10:27:40 +00:00
test [optnone] Make the optnone attribute effective at suppressing function 2014-08-13 10:49:33 +00:00
tools llvm-objdump: print contents of MachO __unwind_info sections 2014-08-12 11:52:59 +00:00
unittests Asserting that the call to chdir succeeds in this test. Fixes some -Wunused-result warnings. 2014-08-13 11:17:41 +00:00
utils [shuffle] Stand back! I'm about to (try to) do math! 2014-08-13 12:27:18 +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
CREDITS.TXT Test commit access 2014-08-09 16:05:23 +00:00
LICENSE.TXT
…
LLVMBuild.txt
…
Makefile
…
Makefile.common
…
Makefile.config.in Track clang r213171 2014-07-16 16:50:34 +00:00
Makefile.rules Temporarily Revert "Nuke the old JIT." as it's not quite ready to 2014-08-07 22:02:54 +00:00
README.txt
…
configure [autoconf] Fixup s/3.5/3.6/. Clang's ident was 3.5.0svn in autoconf build. 2014-07-29 08:35:03 +00:00
llvm.spec.in
…

README.txt 

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

This directory and its subdirectories contain source code for the Low Level
Virtual Machine, a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments.

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
assistance with LLVM, and in particular docs/GettingStarted.rst for getting
started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you're writing a package for LLVM, see docs/Packaging.rst for our
suggestions.