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Fix code generation error in gcc6809 It turned out that under some circumstances, the gcc optimizer would select an instruction sequence that had the sense of a branch inverted. It seems this was due to a particular instruction pattern included in the machine description not being quite right with respect to how the condition codes were tracked. Removing that instruction pattern seems to fix things (subtraction with the arguments reversed). gcc seems to be smart enough to figure out how to reorganize code to work without this reversed sense subtraction and then do the right thing.
author William Astle <lost@l-w.ca>
date Thu, 24 Mar 2016 20:07:20 -0600
parents 84eb35251849
children 92cabf300986
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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84eb35251849 Added extra scripts that can be used to run gcc6809 with lwtools as its binutils
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1 #!/bin/sh
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2 #
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3 #
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4 # Copyright 2009 by William Astle <lost@l-w.ca>
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5 #
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6 #This file is part of LWTOOLS.
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7 #
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8 #LWTOOLS is free software: you can redistribute it and/or modify it under the
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9 #terms of the GNU General Public License as published by the Free Software
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10 #Foundation, either version 3 of the License, or (at your option) any later
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11 #version.
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12 #
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13 #This program is distributed in the hope that it will be useful, but WITHOUT
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14 #ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 #FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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16 #more details.
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17 #
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18 #You should have received a copy of the GNU General Public License along with
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19 #this program. If not, see <http://www.gnu.org/licenses/>.
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20
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21 # this was based somewhat on the "ar" script from gcc6809
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22
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23 # This script is a frontend to the lwar library manager, to make it
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24 # look more like GNU ar. Not all ar features are supported here.
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25 # It basically translates ar style options into lwar format.
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26
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27 # Parse and translate command-line options
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28
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29 # ar options cheatsheet:
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30 # r: insert (with replace)
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31 # c: create archive
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32 # u: only replace newer files
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33 # v: verbose mode
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34 # x: extract files from archive
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35
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36 options=$1; shift
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37 case $options in
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38 rc|cru|-rc|-cru)
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39 options="--replace --create"
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40 ;;
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41 rv)
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42 options="--replace"
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43 ;;
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44 x|-x)
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45 options="--extract"
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46 ;;
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47 -C|--cache)
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48 exit 0
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49 ;;
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50 *)
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51 options="--replace --create $options"
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52 if [ "$libname" = "" ]; then
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53 libname=$options
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54 fi
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55 ;;
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56 esac
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57
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58 if [ "x$options" = "x" ]; then
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59 echo "ar (m6809): no options given"
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60 exit 1
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61 fi
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62
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63 # Run the real lwar with translated options.
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64 exec lwar $options $*