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annotate extra/ld @ 418:3832a68d83ef
Fix internal compiler error on "var2 = var1 + 1" patterns
This appears to be the correct fix. It was provided by Tormod Volden
(debian.tormod@gmail.com). The final commit is substantially different from
Tormod's submission mostly due to housecleaning (removing the old patches
and updating the README). Tormod's comments follow.
The original addhi_mem_1 "insn" instruction pattern /matches/ two
memory operands, just with the /constraint/ that these are the same
location. A pattern match tells the compiler "you should be able to use
this, but you might have to work on it to meet the constraints". For
typical constraints on registers the compiler can add "reloads", moving
stuff between registers or from memory, until the constraints are met
and the instruction can be used. However, in this case, no amount of
reloads can make two memory locations the same if they already weren't,
so the compiler breaks down and cries "unable to generate reloads".
It seems this issue only appears if optimization is enabled. The proof
is in gcc's reload.c and is left as an exercise to the reader.
Limiting the matching pattern to identical memory operands avoids
these situations, while allowing the common "var++" cases.
References:
The pattern/constraints difference is explained in
https://gcc.gnu.org/onlinedocs/gccint/Simple-Constraints.html#index-other-register-constraints-3335
author | William Astle <lost@l-w.ca> |
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date | Tue, 29 Mar 2016 21:21:49 -0600 |
parents | 26d2791672b1 |
children | a3711f5ac569 |
rev | line source |
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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 "as" script from gcc6809 |
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22 |
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23 #echo "LWTOOLS-ld $0 $*" |
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24 path_to_lwlink=lwlink |
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25 |
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26 # Set defaults. Some are based on the target type, which is |
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27 # determined by the name by which the program was invoked. |
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28 output_file=a.out |
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29 libpaths= |
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30 libs= |
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31 stdlibpaths="-L=/usr/local/lib -L=/usr/lib -L=/lib" |
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32 verbose= |
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33 |
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34 if [ "$verbose" = 1 ]; then |
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35 echo "$0 $@" |
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36 fi |
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37 |
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38 case $0 in |
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39 *m6809-coco-*) |
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40 options="--format=decb" |
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41 # options="-b .text=0x2000 -b .data=0x7000 -b .bss=0x7C00 -b .ctors=0x7F00 -b .dtors=0x7F80 -b vector=0x7FF0" |
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42 # aslink_options="-nwxst" |
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43 # exe_suffix=.bin |
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44 ;; |
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45 *) |
395 | 46 options="--format=raw" |
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47 # options="-b .text=0x8000 -b .data=0x1000 -b .bss=0x0100 -b .ctors=0xFD00 -b .dtors=0xFE00 -b vector=0xFFF0" |
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48 # aslink_options="-nwxso" |
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49 # exe_suffix=.s19 |
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50 ;; |
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51 esac |
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52 |
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53 |
184 | 54 while [ "$*" != "" ]; do |
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55 arg=$1; shift |
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56 case $arg in |
184 | 57 -d|-dc|-dp) |
58 # force allocation of space to common symbols | |
59 # even if relocatable output file is specified | |
60 # not supported by targets | |
61 ;; | |
62 -X) | |
63 # strip unneeded stuff | |
64 # ignored - really just a no-op | |
65 ;; | |
72
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66 -gn) |
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67 # Generate NoICE debug file |
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68 # ignored because debugging not supported by targets |
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69 ;; |
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70 -gs) |
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71 # Generate SDCC debug file |
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72 # ignored because debugging not supported by targets |
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73 ;; |
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74 -o) |
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75 output_file=$1; shift |
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76 ;; |
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77 -L*) |
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78 arg=${arg#-L} |
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79 libpaths="$libpaths --library-path=$arg" |
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80 ;; |
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81 -l*) |
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82 arg=${arg#-l} |
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83 libs="$libs --library=$arg" |
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84 ;; |
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85 --section-start) |
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86 section_value=$1; shift |
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87 options="$options --section-base=$section_value" |
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88 ;; |
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89 |
395 | 90 -Map=*) |
91 arg=${arg#-Map=}; shift | |
92 options="$options --map=$arg" | |
197
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93 ;; |
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94 |
395 | 95 --script=*) |
96 options="$options $arg" | |
97 ;; | |
98 -T) | |
99 options="$options --script=$1"; shift | |
100 ;; | |
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101 -Tbss) |
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102 options="$options --section-base=.bss=$1"; shift |
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103 ;; |
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104 -Tdata) |
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105 options="$options --section-base=.data=$1"; shift |
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106 ;; |
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107 -Ttext|-Tcode) |
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108 options="$options --section-base=.text=$1"; shift |
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109 ;; |
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110 -v|--verbose) |
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111 verbose=1 |
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112 ;; |
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113 *crt0.o) |
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114 startup_files=$arg |
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115 ;; |
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116 -g) |
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117 # Ignored by GNU ld; we should do the same |
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118 ;; |
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119 -h|--help) |
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120 echo "ld (m6809)" |
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121 exit 0 |
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122 ;; |
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123 --format-lwex) |
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124 options="$options --format=lwex" |
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125 ;; |
179
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126 |
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127 --sysroot=*) |
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128 options="$options $arg" |
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129 ;; |
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130 |
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131 -nostdlib) |
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132 stdlibpaths= |
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133 ;; |
184 | 134 |
135 -e) | |
136 options="$options --entry=$1" | |
137 shift | |
138 ;; | |
139 | |
140 --entry) | |
141 options="$options $arg" | |
142 ;; | |
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143 |
395 | 144 --relax) |
145 ;; | |
146 --start-group) | |
147 ;; | |
148 --end-group) | |
149 ;; | |
150 --gc-sections) | |
151 ;; | |
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152 -*) |
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153 echo "ld (m6809): unknown option $arg" |
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154 exit 1 |
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155 ;; |
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156 *) |
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157 input_files="$input_files $arg" |
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158 ;; |
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159 esac |
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160 done |
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161 |
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162 options="$options -o $output_file" |
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163 |
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164 if [ "$verbose" = "1" ]; then |
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165 echo "$path_to_lwlink $options $input_files $startup_files $libpaths $stdlibpaths $libs" |
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166 fi |
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167 |
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168 $path_to_lwlink $options $input_files $startup_files $libpaths $libs |
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169 rc=$? |
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170 |
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171 if [ "$rc" != "0" ]; then |
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172 rm -f $output_file |
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173 exit $rc |
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174 fi |