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David Majnemer d7465d2b1f [X86] Use the right type when folding xor (truncate (shift)) -> setcc 
The result type of setcc is dependent on whether or not AVX512 is
present.
We had an X86-specific DAG-combine which assumed that the result type
should be i8 when it could be i1.
This meant that we would generate illegal setccs which LowerSETCC did
not like.

Instead, use an appropriate type and zero extend to i8.

Also, there were some scenarios where the fold should have fired but
didn't because we were overly cautious about the types.  This meant that
we generated:

        shrl    $31, %edi
        andl    $1, %edi
        kmovw   %edi, %k0
        kxnorw  %k0, %k0, %k1
        kshiftrw        $15, %k1, %k1
        kxorw   %k1, %k0, %k0
        kmovw   %k0, %eax

instead of:

        testl   %edi, %edi
        setns   %al

This fixes PR27638.

llvm-svn: 268609
2016-05-05 06:00:56 +00:00
bindings Remove every uses of getGlobalContext() in LLVM (but the C API) 2016-04-14 21:59:01 +00:00
cmake Unify XDEBUG and EXPENSIVE_CHECKS (into the latter), and add an option to the cmake build to enable them. 2016-04-29 15:22:48 +00:00
docs [NVPTX:doc] Update code examples to conform to the latest IR. 2016-05-04 17:34:57 +00:00
examples Remove every uses of getGlobalContext() in LLVM (but the C API) 2016-04-14 21:59:01 +00:00
include [Profile] Raw profile header clean up 2016-05-05 04:07:30 +00:00
lib [X86] Use the right type when folding xor (truncate (shift)) -> setcc 2016-05-05 06:00:56 +00:00
projects Remove autoconf support 2016-01-26 21:29:08 +00:00
resources In MSVC builds embed a VERSIONINFO resource in our exe and DLL files. 2015-06-12 15:58:29 +00:00
test [X86] Use the right type when folding xor (truncate (shift)) -> setcc 2016-05-05 06:00:56 +00:00
tools [codeview] Move dumper into lib/DebugInfo/CodeView 2016-05-05 00:34:33 +00:00
unittests Fix build of DebugInfoPDBTests. 2016-05-04 21:06:12 +00:00
utils Win packaging script: include the OpenMP run-time 2016-05-03 16:43:40 +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
.clang-tidy Don't use misc-unused-parameters check on LLVM. 2016-04-13 08:58:52 +00:00
.gitignore Minor updates to gitignore so that symlinks are ignored in the projects dir. 2015-07-07 20:24:58 +00:00
CMakeLists.txt cmake: Prefix Polly options with LLVM_ to avoid variable shadowing 2016-05-04 20:04:40 +00:00
CODE_OWNERS.TXT Update owners to reflect recent changes 2016-04-01 20:40:49 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Fix typos 2016-05-02 19:06:51 +00:00
LICENSE.TXT Update copyright year to 2016. 2016-03-30 22:41:06 +00:00
llvm.spec.in [Sparc] Implement i64 load/store support for 32-bit sparc. 2015-08-10 19:11:39 +00:00
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
README.txt Revert previous test commit. 2016-01-04 19:13:29 +00:00

README.txt 

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

This directory and its subdirectories contain source code for LLVM,
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 are writing a package for LLVM, see docs/Packaging.rst for our
suggestions.