llvm-6502

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LLVM backend for 6502

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Chris Lattner 7fb64347d7 Substantially revamp the local spiller, causing it to actually improve the generated code over the simple spiller. The new local spiller generates substantially better code than the simple one in some cases, by reusing values that are loaded out of stack slots and kept available in registers. This primarily helps programs that are spilling a lot, and there is still stuff that can be done to improve it. This patch makes the local spiller the default, as it's only a tiny bit slower than the simple spiller (it increases the runtime of llc by < 1%). Here are some numbers with speedups. Program #reuse old(s) new(s) Speedup Povray: 3452, 16.87 -> 15.93 (5.5%) 177.mesa: 2176, 2.77 -> 2.76 (0%) 179.art: 35, 28.43 -> 28.01 (1.5%) 183.equake: 55, 61.44 -> 61.41 (0%) 188.ammp: 869, 174 -> 149 (15%) 164.gzip: 43, 40.73 -> 40.71 (0%) 175.vpr: 351, 18.54 -> 17.34 (6.5%) 176.gcc: 2471, 5.01 -> 4.92 (1.8%) 181.mcf 42, 79.30 -> 75.20 (5.2%) 186.crafty: 484, 29.73 -> 30.04 (-1%) 197.parser: 251, 10.47 -> 10.67 (-1%) 252.eon: 1501, 1.98 -> 1.75 (12%) 253.perlbm: 1183, 14.83 -> 14.42 (2.8%) 254.gap: 825, 7.46 -> 7.29 (2.3%) 255.vortex: 285, 10.51 -> 10.27 (2.3%) 256.bzip2: 63, 55.70 -> 55.20 (0.9%) 300.twolf: 830, 21.63 -> 22.00 (-1%) PtrDist/ks 14, 32.75 -> 17.53 (46.5%) Olden/tsp 46, 8.71 -> 8.24 (5.4%) Free/distray 70, 1.09 -> 0.99 (9.2%) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16629 91177308-0d34-0410-b5e6-96231b3b80d8		2004-10-01 19:04:51 +00:00
autoconf	Improve warning	2004-09-27 07:35:19 +00:00
docs	Add note about converting Skeleton to a useful backend and using it in the	2004-10-01 18:36:22 +00:00
examples	Correct the file header to reflect the new "examples" home for the file.	2004-09-11 20:30:11 +00:00
include/llvm	Add const version of getLastBlock() member function.	2004-09-30 21:42:02 +00:00
lib	Substantially revamp the local spiller, causing it to actually improve the	2004-10-01 19:04:51 +00:00
projects	Stacker compiler library doesn't need to be shared and it can cause	2004-09-15 06:22:54 +00:00
runtime	Disable libprofile as it breaks the build on Sparc (autoconf issues).	2004-09-08 20:30:26 +00:00
test	The verifier takes 50s on this testcase, that is not good n stuff	2004-09-29 20:07:25 +00:00
tools	Hrm, if there is an error loading a file, try printing a message so the	2004-09-27 16:41:01 +00:00
utils	#include DataTypes.h to compile on MinGW, patch by Henrik Bach.	2004-09-30 18:27:39 +00:00
.cvsignore	Ok, try #2 , this time I'll not be stupid	2003-08-03 18:33:24 +00:00
configure	Improve warning	2004-09-27 07:35:19 +00:00
CREDITS.TXT	Update email address	2004-09-23 04:39:30 +00:00
LICENSE.TXT	Adjust the license files based on the actual content of llvm and llvm-test	2004-09-16 16:41:31 +00:00
llvm.spec	Updated for 1.3.	2004-08-16 15:17:40 +00:00
llvm.spec.in	Updated for 1.3.	2004-08-16 15:17:40 +00:00
Makefile	Changed the distclean target to handle the new location of config.h.	2004-09-17 15:08:25 +00:00
Makefile.common	Standardize header comments of top-level Makefiles.	2004-04-24 00:10:56 +00:00
Makefile.config.in	PAPI is not used here.	2004-09-07 17:34:34 +00:00
Makefile.rules	Corrected spelling of Makefile variable, thereby re-enabling profile	2004-09-28 14:52:58 +00:00
README.txt	Make the text of this file a little more useful.	2004-09-02 22:49:27 +00:00

README.txt

Low Level Virtual Machine (LLVM)
================================

This directory and its subdirectories contain source code for the Low Level 
Virtual Machine, a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments. 

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the HTML documentation provided in docs/index.html for further
assistance with LLVM.