llvm-6502

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LLVM backend for 6502

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Andrew Trick 64925c55c6 Enable LSR IV Chains with sufficient heuristics. These heuristics are sufficient for enabling IV chains by default. Performance analysis has been done for i386, x86_64, and thumbv7. The optimization is rarely important, but can significantly speed up certain cases by eliminating spill code within the loop. Unrolled loops are prime candidates for IV chains. In many cases, the final code could still be improved with more target specific optimization following LSR. The goal of this feature is for LSR to make the best choice of induction variables. Instruction selection may not completely take advantage of this feature yet. As a result, there could be cases of slight code size increase. Code size can be worse on x86 because it doesn't support postincrement addressing. In fact, when chains are formed, you may see redundant address plus stride addition in the addressing mode. GenerateIVChains tries to compensate for the common cases. On ARM, code size increase can be mitigated by using postincrement addressing, but downstream codegen currently misses some opportunities. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147826 91177308-0d34-0410-b5e6-96231b3b80d8		2012-01-10 01:45:08 +00:00
autoconf	revert r147542 after comments from Joerg Sonnenberger	2012-01-05 18:28:46 +00:00
bindings	Update OCaml bindings for the new half float type.	2011-12-28 18:51:08 +00:00
cmake	revert r147542 after comments from Joerg Sonnenberger	2012-01-05 18:28:46 +00:00
docs	Fix dead link	2012-01-07 04:11:27 +00:00
examples	LLVMBuild: Remove trailing newline, which irked me.	2011-12-12 19:48:00 +00:00
include	Enable LSR IV Chains with sufficient heuristics.	2012-01-10 01:45:08 +00:00
lib	Enable LSR IV Chains with sufficient heuristics.	2012-01-10 01:45:08 +00:00
projects	revert r147542 after comments from Joerg Sonnenberger	2012-01-05 18:28:46 +00:00
runtime	LLVMBuild: Remove trailing newline, which irked me.	2011-12-12 19:48:00 +00:00
test	Enable LSR IV Chains with sufficient heuristics.	2012-01-10 01:45:08 +00:00
tools	Remove the logging streamer.	2012-01-10 00:40:39 +00:00
unittests	Undo the hack in r147427 and move this unittest to a better home. This	2012-01-02 09:19:48 +00:00
utils	Use descriptive variable name and remove incorrect operand number check.	2012-01-09 21:30:46 +00:00
.gitignore	git: Add tools/lldb to the ignore list.	2011-11-10 22:55:50 +00:00
CMakeLists.txt	capitalize project name, reference bugzilla	2011-12-18 18:50:16 +00:00
configure	revert r147542 after comments from Joerg Sonnenberger	2012-01-05 18:28:46 +00:00
CREDITS.TXT	CREDITS.TXT: Add a line. (test commit)	2011-10-29 23:42:14 +00:00
LICENSE.TXT	Happy new year 2012!	2012-01-01 08:16:56 +00:00
llvm.spec.in
LLVMBuild.txt	LLVMBuild: Introduce a common section which currently has a list of the	2011-12-12 22:45:54 +00:00
Makefile	llvm-config: Replace with C++ version (was llvm-config-2).	2011-12-01 20:18:09 +00:00
Makefile.common	Removed trailing whitespace from Makefiles.	2009-01-09 16:44:42 +00:00
Makefile.config.in	capitalize project name, reference bugzilla	2011-12-18 18:50:16 +00:00
Makefile.rules	PR11642 has been fixed, enable -fvisibility-inlines-hidden everywhere.	2011-12-27 21:37:11 +00:00
README.txt	Undo test commit	2011-11-22 20:05:48 +00:00

README.txt

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