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LLVM backend for 6502
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49f69b8e25
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James Molloy 49f69b8e25 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@237453 91177308-0d34-0410-b5e6-96231b3b80d8
2015-05-15 16:10:59 +00:00
autoconf
bindings IR: Give 'DI' prefix to debug info metadata 2015-04-29 16:38:44 +00:00
cmake cmake: Use -fno-sanitize-recover=all - the old spelling is deprecated 2015-05-14 04:52:57 +00:00
docs Doxygen: Enable autobrief feature and update coding standards. 2015-05-15 03:34:01 +00:00
examples
include Allow min/max detection to see through casts. 2015-05-15 16:04:50 +00:00
lib Canonicalize min/max expressions correctly. 2015-05-15 16:10:59 +00:00
projects
test Canonicalize min/max expressions correctly. 2015-05-15 16:10:59 +00:00
tools [llvm-readobj] Teach llvm-readobj to print PT_MIPS_ABIFLAGS program header 2015-05-15 15:59:22 +00:00
unittests YAML: Add support for literal block scalar I/O. 2015-05-14 23:08:22 +00:00
utils [TableGen] Remove ListInit::size() in favor of getSize() which does the same thing and is already used in most places. NFC. 2015-05-14 05:53:56 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.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 Update for a new year. 2015-03-12 01:25:29 +00:00
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in
Makefile.rules Add support for SunOS function/data sections and associated 2015-03-03 20:54:29 +00:00
README.txt

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