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Andrea Di Biagio cfdf805286 [X86] Teach how to combine horizontal binop even in the presence of undefs. 
Before this change, the backend was unable to fold a build_vector dag
node with UNDEF operands into a single horizontal add/sub.

This patch teaches how to combine a build_vector with UNDEF operands into a
horizontal add/sub when possible. The algorithm conservatively avoids to combine
a build_vector with only a single non-UNDEF operand.

Added test haddsub-undef.ll to verify that we correctly fold horizontal binop
even in the presence of UNDEFs.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211265 91177308-0d34-0410-b5e6-96231b3b80d8
2014-06-19 10:29:41 +00:00
autoconf Remove path_tclsh.m4. 2014-06-02 12:54:32 +00:00
bindings [OCaml] Unbreak Llvm_target.TargetMachine.set_verbose_asm 2014-06-09 17:34:34 +00:00
cmake Remove clang-specific libxml2 check from CMake 2014-06-06 05:08:42 +00:00
docs Revert r211066, 211067, 211068, 211069, 211070. 2014-06-16 22:49:41 +00:00
examples Try to fix the msvc build. 2014-04-29 23:37:02 +00:00
include Remove OwningPtr.h and associated tests 2014-06-19 07:25:18 +00:00
lib [X86] Teach how to combine horizontal binop even in the presence of undefs. 2014-06-19 10:29:41 +00:00
projects Remove projects/sample. 2014-03-12 22:40:22 +00:00
test [X86] Teach how to combine horizontal binop even in the presence of undefs. 2014-06-19 10:29:41 +00:00
tools Move -dwarf-version to an MC level command line option so it's 2014-06-19 06:22:08 +00:00
unittests Remove OwningPtr.h and associated tests 2014-06-19 07:25:18 +00:00
utils Remove OwningPtr.h and associated tests 2014-06-19 07:25:18 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format
.gitignore Remove projects/sample. 2014-03-12 22:40:22 +00:00
CMakeLists.txt Delete trailing whitespace. 2014-06-12 21:27:03 +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
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 Add the coverage cflags to the link step as well to make sure 2014-06-17 23:27:32 +00:00
README.txt Trivial test commit. 2014-04-26 19:05:45 +00:00

README.txt 

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

This directory and its subdirectories contain source code for the Low Level
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LLVM is open source software. You may freely distribute it under the terms of
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Please see the documentation provided in docs/ for further
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documentation setup.

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