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LLVM backend for 6502
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Sanjoy Das e836f05d00 SCEVExpander incorrectly marks generated subtractions as nuw/nsw 
It is not sound to mark the increment operation as `nuw` or `nsw`
based on a proof off of the add recurrence if the increment operation
we emit happens to be a `sub` instruction.

I could not come up with a test case for this -- the cases where
SCEVExpander decides to emit a `sub` instruction is quite small, and I
cannot think of a way I'd be able to get SCEV to prove that the
increment does not overflow in those cases.

Differential Revision: http://reviews.llvm.org/D7899



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230673 91177308-0d34-0410-b5e6-96231b3b80d8
2015-02-26 19:51:35 +00:00
autoconf Support bitrig in autoconf build system. 2015-02-26 19:46:32 +00:00
bindings [PM] Remove the old 'PassManager.h' header file at the top level of 2015-02-13 10:01:29 +00:00
cmake [CMake] Fix the clang-cl self host build. 2015-02-25 20:42:19 +00:00
docs Try to fix a docs link. 2015-02-26 19:48:43 +00:00
examples [Orc][Kaleidoscope] Fix a missed symbol mangling operation in the fully lazy tutorial. 2015-02-26 19:28:37 +00:00
include Use ".arch_extension" ARM directive to specify the additional CPU features 2015-02-26 18:07:35 +00:00
lib SCEVExpander incorrectly marks generated subtractions as nuw/nsw 2015-02-26 19:51:35 +00:00
projects
test [MC] Use the non-EH register mapping in the debug_frame section. 2015-02-26 19:48:07 +00:00
tools gold-plugin: "Upgrade" debug info and handle its warnings. 2015-02-26 18:24:37 +00:00
unittests Object: Handle Mach-O kext bundle files 2015-02-25 22:59:20 +00:00
utils FileCheck: Add CHECK-SAME 2015-02-26 04:53:00 +00:00
.arcconfig
.clang-format
.clang-tidy Enable display of compiler diagnostics in clang-tidy by default. 2014-10-29 17:29:38 +00:00
.gitignore Add one more vim swap file pattern 2015-01-30 21:59:28 +00:00
CMakeLists.txt [CMake] Set policy CMP0051 to OLD globally. 2015-02-24 23:32:47 +00:00
CODE_OWNERS.TXT Assume code ownership for the PS4 to ensure patches get reviewed, per the Developer Policy. 2015-01-28 18:33:39 +00:00
configure Support bitrig in autoconf build system. 2015-02-26 19:46:32 +00:00
CREDITS.TXT Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
Makefile.rules Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
README.txt Revert test commit 2015-02-04 18:46:00 +00:00

README.txt 

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