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LLVM backend for 6502
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d10a9fb25a
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Juergen Ributzka d10a9fb25a [DAG] During DAG legalization keep opaque constants even after expanding. 
The included test case would return the incorrect results, because the expansion
of an shift with a constant shift amount of 0 would generate undefined behavior.

This is because ExpandShiftByConstant assumes that all shifts by constants with
a value of 0 have already been optimized away. This doesn't happen for opaque
constants and usually this isn't a problem, because opaque constants won't take
this code path - they are not supposed to. In the case that the opaque constant
has to be expanded by the legalizer, the legalizer would drop the opaque flag.
In this case we hit the limitations of ExpandShiftByConstant and create incorrect
code.

This commit fixes the legalizer by not dropping the opaque flag when expanding
opaque constants and adding an assertion to ExpandShiftByConstant to catch this
not supported case in the future.

This fixes <rdar://problem/16718472>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207304 91177308-0d34-0410-b5e6-96231b3b80d8
2014-04-26 02:58:04 +00:00
autoconf ARM64: initial backend import 2014-03-29 10:18:08 +00:00
bindings [python] Fix getting section contents. 2014-04-25 06:25:15 +00:00
cmake Added Sphinx documentation generation to CMake build system. 2014-04-18 21:45:25 +00:00
docs Add 'musttail' marker to call instructions 2014-04-24 20:14:34 +00:00
examples
include [LCG] Refactor the duplicated code I added in my last commit here into 2014-04-26 01:03:46 +00:00
lib [DAG] During DAG legalization keep opaque constants even after expanding. 2014-04-26 02:58:04 +00:00
projects Remove projects/sample. 2014-03-12 22:40:22 +00:00
test [DAG] During DAG legalization keep opaque constants even after expanding. 2014-04-26 02:58:04 +00:00
tools Add an -mattr option to the gold plugin to support subtarget features in LTO 2014-04-25 21:46:51 +00:00
unittests DIE: Pass ownership of children via std::unique_ptr rather than raw pointer. 2014-04-25 20:00:34 +00:00
utils llvm-build: Get rid of 'import *' 2014-04-23 19:17:42 +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 Added Sphinx documentation generation to CMake build system. 2014-04-18 21:45:25 +00:00
CODE_OWNERS.TXT ARM Linux support 2014-04-02 23:03:28 +00:00
configure ARM64: initial backend import 2014-03-29 10:18:08 +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 Use -std=gnu++11 on cygwin and mingw. 2014-03-12 20:01:15 +00:00
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