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LLVM backend for 6502
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Rafael Espindola e8075c6877 InstCombine: Improvement to check if signed addition overflows. 
This patch implements two things:

1. If we know one number is positive and another is negative, we return true as
   signed addition of two opposite signed numbers will never overflow.

2. Implemented TODO : If one of the operands only has one non-zero bit, and if
   the other operand has a known-zero bit in a more significant place than it
   (not including the sign bit) the ripple may go up to and fill the zero, but
   won't change the sign. e.x -  (x & ~4) + 1

We make sure that we are ignoring 0 at MSB.

Patch by Suyog Sarda.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209746 91177308-0d34-0410-b5e6-96231b3b80d8
2014-05-28 15:30:40 +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 Wording fix for llvm.global_dtors docs. 2014-05-27 21:35:17 +00:00
examples Try to fix the msvc build. 2014-04-29 23:37:02 +00:00
include remove BasePointer before delinearizing 2014-05-27 22:41:51 +00:00
lib InstCombine: Improvement to check if signed addition overflows. 2014-05-28 15:30:40 +00:00
projects Remove projects/sample. 2014-03-12 22:40:22 +00:00
test InstCombine: Improvement to check if signed addition overflows. 2014-05-28 15:30:40 +00:00
tools tools: avoid use of std::function 2014-05-25 21:37:59 +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 Test commit. 2014-04-10 22:25:51 +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 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)
================================

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