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LLVM backend for 6502
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Louis Gerbarg 78874456fc Add support for combining GEPs across PHI nodes 
Currently LLVM will generally merge GEPs. This allows backends to use more
complex addressing modes. In some cases this is not happening because there
is PHI inbetween the two GEPs:

  GEP1--\
        |-->PHI1-->GEP3
  GEP2--/

This patch checks to see if GEP1 and GEP2 are similiar enough that they can be
cloned (GEP12) in GEP3's BB, allowing GEP->GEP merging (GEP123):

  GEP1--\                     --\                           --\
        |-->PHI1-->GEP3  ==>    |-->PHI2->GEP12->GEP3 == >    |-->PHI2->GEP123
  GEP2--/                     --/                           --/

This also breaks certain use chains that are preventing GEP->GEP merges that the
the existing instcombine would merge otherwise.

Tests included.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209843 91177308-0d34-0410-b5e6-96231b3b80d8
2014-05-29 20:29:47 +00:00
autoconf Don't hard-code ld when extracting host linker version, use ${LD} if 2014-05-28 15:12:55 +00:00
bindings [OCaml] Add an ocamlfind package llvm.all_backends. 2014-05-01 21:00:52 +00:00
cmake AArch64/ARM64: move ARM64 into AArch64's place 2014-05-24 12:50:23 +00:00
docs fixed a few typos 2014-05-28 20:07:37 +00:00
examples Try to fix the msvc build. 2014-04-29 23:37:02 +00:00
include [ADT] Delete the Twine assignment operator 2014-05-29 17:12:05 +00:00
lib Add support for combining GEPs across PHI nodes 2014-05-29 20:29:47 +00:00
projects Remove projects/sample. 2014-03-12 22:40:22 +00:00
test Add support for combining GEPs across PHI nodes 2014-05-29 20:29:47 +00:00
tools [elf2yaml][ELF] Move Info field to the RelocationSection structure. This 2014-05-29 11:05:31 +00:00
unittests Use std::unique_ptr instead of OwningPtr in the MemoryBuffer unittests. 2014-05-18 21:01:46 +00:00
utils utils: Teach lldbDataFormatters to load automatically 2014-05-28 05:45:17 +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 Remove projects/sample. 2014-03-12 22:40:22 +00:00
CMakeLists.txt AArch64/ARM64: move ARM64 into AArch64's place 2014-05-24 12:50:23 +00:00
CODE_OWNERS.TXT ARM Linux support 2014-04-02 23:03:28 +00:00
configure Don't hard-code ld when extracting host linker version, use ${LD} if 2014-05-28 15:12:55 +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 autoconf: Fix libLLVM-Major-Minor-Patch.so symlink 2014-05-15 19:50:25 +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
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.