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LLVM backend for 6502
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Arnold Schwaighofer f28a29b776 Merge load/store sequences with adresses: base + index + offset 
We would also like to merge sequences that involve a variable index like in the
example below.

    int index = *idx++
    int i0 = c[index+0];
    int i1 = c[index+1];
    b[0] = i0;
    b[1] = i1;

By extending the parsing of the base pointer to handle dags that contain a
base, index, and offset we can handle examples like the one above.

The dag for the code above will look something like:

 (load (i64 add (i64 copyfromreg %c)
                (i64 signextend (i8 load %index))))

 (load (i64 add (i64 copyfromreg %c)
                (i64 signextend (i32 add (i32 signextend (i8 load %index))
                                         (i32 1)))))

The code that parses the tree ignores the intermediate sign extensions. However,
if there is a sign extension it needs to be on all indexes.

 (load (i64 add (i64 copyfromreg %c)
                (i64 signextend (add (i8 load %index)
                                     (i8 1))))
 vs

 (load (i64 add (i64 copyfromreg %c)
                (i64 signextend (i32 add (i32 signextend (i8 load %index))
                                         (i32 1)))))
radar://13536387

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178483 91177308-0d34-0410-b5e6-96231b3b80d8
2013-04-01 18:12:58 +00:00
autoconf Refine fenv.h handling: check if the desired macros exist, before using 2013-03-25 13:13:33 +00:00
bindings
cmake Add CMake option LLVM_USE_SANITIZER={Address,Memory,MemoryWithOrigins} to simplify bootstrap of LLVM/Clang under ASan/MSan 2013-03-26 07:49:46 +00:00
docs Add start of user documentation for NVPTX 2013-03-30 16:41:14 +00:00
examples
include Add support for vector data types in the LLVM interpreter. 2013-04-01 15:53:30 +00:00
lib Merge load/store sequences with adresses: base + index + offset 2013-04-01 18:12:58 +00:00
projects
runtime
test Merge load/store sequences with adresses: base + index + offset 2013-04-01 18:12:58 +00:00
tools Run the ObjCARCContract pass for LTO. <rdar://problem/13538084> 2013-03-29 23:28:55 +00:00
unittests SmallVector and SmallPtrSet allocations now power-of-two aligned. 2013-03-29 22:07:12 +00:00
utils Fix TableGen subtarget-emitter to handle A9/Swift. 2013-03-29 19:08:31 +00:00
.arcconfig
.gitignore
CMakeLists.txt Add CMake option LLVM_USE_SANITIZER={Address,Memory,MemoryWithOrigins} to simplify bootstrap of LLVM/Clang under ASan/MSan 2013-03-26 07:49:46 +00:00
CODE_OWNERS.TXT Update 2013-03-18 17:47:33 +00:00
configure Refine fenv.h handling: check if the desired macros exist, before using 2013-03-25 13:13:33 +00:00
CREDITS.TXT Update 2013-03-18 17:47:33 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in Turn anonymous type in anonymous union warning back on after cleaning up 2013-03-15 00:43:00 +00:00
Makefile.rules Turn anonymous type in anonymous union warning back on after cleaning up 2013-03-15 00:43:00 +00:00
README.txt

README.txt 

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

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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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