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LLVM backend for 6502
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James Molloy d594ba0815 Reapply r237539 with a fix for the Chromium build. 
Make sure if we're truncating a constant that would then be sign extended
that the sign extension of the truncated constant is the same as the
original constant.

> Canonicalize min/max expressions correctly.
>
> This patch introduces a canonical form for min/max idioms where one operand
> is extended or truncated. This often happens when the other operand is a
> constant. For example:
>
> %1 = icmp slt i32 %a, i32 0
> %2 = sext i32 %a to i64
> %3 = select i1 %1, i64 %2, i64 0
>
> Would now be canonicalized into:
>
> %1 = icmp slt i32 %a, i32 0
> %2 = select i1 %1, i32 %a, i32 0
> %3 = sext i32 %2 to i64
>
> This builds upon a patch posted by David Majenemer
> (https://www.marc.info/?l=llvm-commits&m=143008038714141&w=2). That pass
> passively stopped instcombine from ruining canonical patterns. This
> patch additionally actively makes instcombine canonicalize too.
>
> Canonicalization of expressions involving a change in type from int->fp
> or fp->int are not yet implemented.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237821 91177308-0d34-0410-b5e6-96231b3b80d8
2015-05-20 18:41:25 +00:00
autoconf Deprecate in-source autotools builds 2015-05-04 02:04:54 +00:00
bindings IR: Give 'DI' prefix to debug info metadata 2015-04-29 16:38:44 +00:00
cmake Try to fix the build with MSVC 2015 by disabling sized deallocation 2015-05-19 23:28:23 +00:00
docs Dereferenceable, dereferenceable_or_null metadata for loads 2015-05-19 20:10:19 +00:00
examples BrainF.cpp: Update CreateCall() according to r237624. 2015-05-19 06:50:19 +00:00
include MC: Use MCSymbol in LocalCommon, NFC 2015-05-20 18:25:40 +00:00
lib Reapply r237539 with a fix for the Chromium build. 2015-05-20 18:41:25 +00:00
projects build: make libunwind a proper project 2015-04-25 01:47:39 +00:00
test Reapply r237539 with a fix for the Chromium build. 2015-05-20 18:41:25 +00:00
tools [DWARF parser] Make DWARF parser more robust against missing compile/type units. 2015-05-19 21:54:32 +00:00
unittests Get Triple::getARMCPUForArch() to use TargetParser 2015-05-20 15:05:07 +00:00
utils Improve check on git-svnrevert, better error message 2015-05-16 10:23:48 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitignore Ignore compile_commands.json only at the root of the tree. 2015-03-26 18:55:42 +00:00
CMakeLists.txt Enable solid lzma compression for cpack, decreases setup size by ~30% 2015-05-14 17:07:41 +00:00
CODE_OWNERS.TXT Added Andrey Churbanov as the owner of the OpenMP runtime library code 2015-05-05 20:17:53 +00:00
configure Deprecate in-source autotools builds 2015-05-04 02:04:54 +00:00
CREDITS.TXT
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in Deprecate in-source autotools builds 2015-05-04 02:04:54 +00:00
Makefile.rules
README.txt Revert test commit at revision 233535. 2015-03-30 12:39:03 +00:00

README.txt 

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