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LLVM backend for 6502
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Chris Lattner 39e73f7c83 Special case tblgen generated code for patterns like (and X, 255) or (or X, 42). 
The dag/inst combiners often 'simplify' the masked value based on whether
or not the bits are live or known zero/one.  This is good and dandy, but
often causes special case patterns to fail, such as alpha's CMPBGE pattern,
which looks like "(set GPRC:$RC, (setuge (and GPRC:$RA, 255), (and GPRC:$RB, 255)))".
Here the pattern for (and X, 255) should match actual dags like (and X, 254) if
the dag combiner proved that the missing bits are already zero (one for 'or').

For CodeGen/Alpha/cmpbge.ll:test2 for example, this results in:

        sll $16,1,$0
        cmpbge $0,$17,$0
        ret $31,($26),1

instead of:

        sll $16,1,$0
        and $0,254,$0
        and $17,255,$1
        cmpule $1,$0,$0
        ret $31,($26),1

... and requires no target-specific code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30871 91177308-0d34-0410-b5e6-96231b3b80d8
2006-10-11 04:05:55 +00:00
autoconf Fix misleading warning message 2006-10-02 17:23:42 +00:00
docs Update documentaion of node annotation (coloring) in viewGraph. 2006-10-02 12:28:07 +00:00
examples Use llvm-config to determine what to link in 2006-09-04 06:04:03 +00:00
include/llvm add two helper methods. 2006-10-11 03:58:02 +00:00
lib add two helper methods. 2006-10-11 03:58:02 +00:00
projects Don't build the runtime library if LLVMGCC is not configured. 2006-10-02 19:10:56 +00:00
runtime Describe and date modifications we made per LGPL requirements. 2006-08-08 14:47:54 +00:00
test Both of these functions should turn into cmpbge instructions, even though 2006-10-11 03:59:48 +00:00
tools Make the bugpoint reduction heuristics more effective. Patch submitted by 2006-10-10 21:42:25 +00:00
utils Special case tblgen generated code for patterns like (and X, 255) or (or X, 42). 2006-10-11 04:05:55 +00:00
win32 Keep Visual Studio happy. 2006-05-03 00:28:50 +00:00
Xcode Adding new files. 2006-09-07 22:07:57 +00:00
.cvsignore Ignore stuff built by "make dist". 2006-04-07 15:55:18 +00:00
configure fix misleading warning 2006-10-02 17:24:55 +00:00
CREDITS.TXT The list is sorted by name. 2006-08-29 01:42:47 +00:00
LICENSE.TXT burg is gone 2006-09-11 17:28:11 +00:00
llvm.spec.in Minor technical correction in documentation. 2006-08-21 01:58:57 +00:00
Makefile Document build order dependencies. Make sure that llvm-config is built before 2006-09-04 04:27:07 +00:00
Makefile.common Update comments to reflect new variable names. Patch contributed by 2005-02-14 16:02:19 +00:00
Makefile.config.in Make the name of the project consistent with that specified in the 2006-08-07 23:23:39 +00:00
Makefile.rules Move CompileCommonOpts to the end of the list so that EXTRA_OPTIONS=-O0 will 2006-09-29 18:47:13 +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,
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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
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