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Make pcr relative forward references better able to select 8 bit offsets
author William Astle <lost@l-w.ca>
date Wed, 28 Feb 2018 23:00:59 -0700
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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
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2 <HTML
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3 ><HEAD
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4 ><TITLE
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5 >Convenience Instructions</TITLE
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6 ><META
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7 NAME="GENERATOR"
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8 CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
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9 REL="HOME"
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10 TITLE="LW Tool Chain"
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11 HREF="index.html"><LINK
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12 REL="UP"
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13 TITLE="LWASM"
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14 HREF="c62.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="Assembler Modes and Pragmas"
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17 HREF="x659.html"><LINK
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18 REL="NEXT"
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19 TITLE="Cycle Counts"
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20 HREF="x805.html"></HEAD
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21 ><BODY
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22 CLASS="SECTION"
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23 BGCOLOR="#FFFFFF"
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24 TEXT="#000000"
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25 LINK="#0000FF"
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26 VLINK="#840084"
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27 ALINK="#0000FF"
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28 ><DIV
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29 CLASS="NAVHEADER"
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30 ><TABLE
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31 SUMMARY="Header navigation table"
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32 WIDTH="100%"
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33 BORDER="0"
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34 CELLPADDING="0"
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35 CELLSPACING="0"
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36 ><TR
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37 ><TH
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38 COLSPAN="3"
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39 ALIGN="center"
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40 >LW Tool Chain</TH
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41 ></TR
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42 ><TR
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43 ><TD
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44 WIDTH="10%"
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45 ALIGN="left"
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46 VALIGN="bottom"
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47 ><A
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48 HREF="x659.html"
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49 ACCESSKEY="P"
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50 >Prev</A
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51 ></TD
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52 ><TD
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53 WIDTH="80%"
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54 ALIGN="center"
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55 VALIGN="bottom"
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56 >Chapter 3. LWASM</TD
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57 ><TD
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58 WIDTH="10%"
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59 ALIGN="right"
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60 VALIGN="bottom"
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61 ><A
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62 HREF="x805.html"
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63 ACCESSKEY="N"
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64 >Next</A
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65 ></TD
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66 ></TR
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67 ></TABLE
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68 ><HR
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69 ALIGN="LEFT"
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70 WIDTH="100%"></DIV
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71 ><DIV
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72 CLASS="SECTION"
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73 ><H1
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74 CLASS="SECTION"
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75 ><A
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76 NAME="CONVINST"
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77 >3.11. Convenience Instructions</A
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78 ></H1
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79 ><P
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80 >&#13;Similar to the 6800 compatibility instructions (pragma 6800compat) these
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81 pragma 6809conv and pragma 6309conv enable convenience extensions to the
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82 6809 and 6309 instruction set. Originally intended for compatibility with
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83 the MACRO-80c assembler, these have proven useful in large codebases that
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84 target both the 6809 and the 6309.</P
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85 ><P
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86 >&#13;The 6809 extensions are straightforward with the exception of "TSTD" which
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87 assembles as "STD -2,S". A benefit of using these is they will "just work"
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88 and take on their 6309 equivalent when you enable 6309 assembly mode.
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89 Supported instructions: ASRD, CLRD, COMD, LSLD, LSRD, NEGD, TSTD.</P
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90 ><P
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91 >&#13;6309 extensions are based on common patterns described by Chris Burke and
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92 Darren Atkinson in their 6309 documentation and include the following
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93 instructions: ASRQ, CLRQ, COMQ, LSLE, LSLF, LSLQ, LSRQ, NEGE,
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94 NEGF, NEGW, NEGQ, TSTQ.</P
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95 ></DIV
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96 ><DIV
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97 CLASS="NAVFOOTER"
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98 ><HR
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99 ALIGN="LEFT"
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100 WIDTH="100%"><TABLE
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101 SUMMARY="Footer navigation table"
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102 WIDTH="100%"
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103 BORDER="0"
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104 CELLPADDING="0"
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105 CELLSPACING="0"
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106 ><TR
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107 ><TD
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108 WIDTH="33%"
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109 ALIGN="left"
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110 VALIGN="top"
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111 ><A
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112 HREF="x659.html"
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113 ACCESSKEY="P"
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114 >Prev</A
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115 ></TD
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116 ><TD
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117 WIDTH="34%"
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118 ALIGN="center"
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119 VALIGN="top"
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120 ><A
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121 HREF="index.html"
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122 ACCESSKEY="H"
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123 >Home</A
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124 ></TD
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125 ><TD
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126 WIDTH="33%"
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127 ALIGN="right"
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128 VALIGN="top"
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129 ><A
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130 HREF="x805.html"
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131 ACCESSKEY="N"
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132 >Next</A
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133 ></TD
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134 ></TR
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135 ><TR
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136 ><TD
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137 WIDTH="33%"
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138 ALIGN="left"
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139 VALIGN="top"
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140 >Assembler Modes and Pragmas</TD
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141 ><TD
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142 WIDTH="34%"
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143 ALIGN="center"
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144 VALIGN="top"
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145 ><A
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146 HREF="c62.html"
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147 ACCESSKEY="U"
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148 >Up</A
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149 ></TD
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150 ><TD
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151 WIDTH="33%"
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152 ALIGN="right"
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153 VALIGN="top"
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154 >Cycle Counts</TD
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155 ></TR
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156 ></TABLE
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157 ></DIV
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158 ></BODY
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159 ></HTML
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160 >