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Fix bug in like terms collection in expression simplification Like term collection would lose the actual "variable" part of the term if the second term collected happened to have no coefficient. This would cause the expression to take the value of the calculated coefficient which is obviously wrong. Thanks to hider <stego@satx.rr.com> for reporting the bug and providing a proper test case. Observation: this bug has been present since the first pre-release of lwtools 3.0 when the algebraic expression system was introduced. Apparently people tend not to create expressions that trigger the like terms handler. The specific conditions require the symbol to be undefined and the second operand to the addition has to have no coefficient so it's likely a fairly rare scenario. Still, it is somewhat surprising that nobody tripped on it before now.
author William Astle <lost@l-w.ca>
date Mon, 23 Jan 2017 22:58:36 -0700
parents b30091890d62
children
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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 >DECB Binaries</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="Output Formats"
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14 HREF="c21.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="Output Formats"
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17 HREF="c21.html"><LINK
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18 REL="NEXT"
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19 TITLE="ASCII Hexadecimal"
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20 HREF="x32.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="c21.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 2. Output Formats</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="x32.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="AEN27"
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77 >2.2. DECB Binaries</A
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78 ></H1
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79 ><P
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80 >A DECB binary is compatible with the LOADM command in Disk Extended
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81 Color Basic on the CoCo. They are also compatible with CLOADM from Extended
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82 Color Basic. These binaries include the load address of the binary as well
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83 as encoding an execution address. These binaries may contain multiple loadable
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84 sections, each of which has its own load address.</P
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85 ><P
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86 >Each binary starts with a preamble. Each preamble is five bytes long. The
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87 first byte is zero. The next two bytes specify the number of bytes to load
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88 and the last two bytes specify the address to load the bytes at. Then, a
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89 string of bytes follows. After this string of bytes, there may be another
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90 preamble or a postamble. A postamble is also five bytes in length. The first
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91 byte of the postamble is $FF, the next two are zero, and the last two are
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92 the execution address for the binary.</P
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93 ><P
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94 >Both LWASM and LWLINK can output this format.</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="c21.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="x32.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 >Output Formats</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="c21.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 >ASCII Hexadecimal</TD
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155 ></TR
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156 ></TABLE
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157 ></DIV
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parents:
diff changeset
158 ></BODY
b30091890d62 Add documentation of the new hex output formats.
William Astle <lost@l-w.ca>
parents:
diff changeset
159 ></HTML
b30091890d62 Add documentation of the new hex output formats.
William Astle <lost@l-w.ca>
parents:
diff changeset
160 >