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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 >ASCII Hexadecimal</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="DECB Binaries"
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17 HREF="x27.html"><LINK
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18 REL="NEXT"
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19 TITLE="Motorola S-Record"
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20 HREF="x36.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="x27.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="x36.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="AEN32"
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77 >2.3. ASCII Hexadecimal</A
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78 ></H1
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79 ><P
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80 >This human-readable ASCII hexadecimal format consists of CR+LF terminated
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81 lines of ASCII text. Each line has the following structure: a zero-padded
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82 four-digit ASCII hex address, a colon separator, and one or more zero-padded
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83 two-digit hex values separated by commas. ASCII Hexadecimal format favors
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84 paragraph-aligned addresses (i.e. a least significant address nybble value
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85 of zero). During output, the number of hex values on each line are adjusted
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86 to align the address of the next line on a paragraph boundary. The sequence
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87 of addresses in the ASCII Hexadecimal file directly follows that of the source
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88 file; multiple ORG directives in the source code may result in out-of-sequence
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89 addresses in the ASCII Hexadecimal output.</P
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90 ><P
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91 >LWASM can output this format since version 4.10.</P
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92 ></DIV
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93 ><DIV
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94 CLASS="NAVFOOTER"
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95 ><HR
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96 ALIGN="LEFT"
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97 WIDTH="100%"><TABLE
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98 SUMMARY="Footer navigation table"
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99 WIDTH="100%"
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100 BORDER="0"
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101 CELLPADDING="0"
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102 CELLSPACING="0"
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103 ><TR
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104 ><TD
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105 WIDTH="33%"
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106 ALIGN="left"
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107 VALIGN="top"
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108 ><A
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109 HREF="x27.html"
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110 ACCESSKEY="P"
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111 >Prev</A
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112 ></TD
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113 ><TD
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114 WIDTH="34%"
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115 ALIGN="center"
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116 VALIGN="top"
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117 ><A
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118 HREF="index.html"
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119 ACCESSKEY="H"
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120 >Home</A
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121 ></TD
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122 ><TD
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123 WIDTH="33%"
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124 ALIGN="right"
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125 VALIGN="top"
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126 ><A
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127 HREF="x36.html"
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128 ACCESSKEY="N"
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129 >Next</A
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130 ></TD
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131 ></TR
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132 ><TR
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133 ><TD
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134 WIDTH="33%"
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135 ALIGN="left"
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136 VALIGN="top"
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137 >DECB Binaries</TD
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138 ><TD
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139 WIDTH="34%"
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140 ALIGN="center"
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141 VALIGN="top"
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142 ><A
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143 HREF="c21.html"
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144 ACCESSKEY="U"
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145 >Up</A
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146 ></TD
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147 ><TD
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148 WIDTH="33%"
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149 ALIGN="right"
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150 VALIGN="top"
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151 >Motorola S-Record</TD
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152 ></TR
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153 ></TABLE
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154 ></DIV
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155 ></BODY
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156 ></HTML
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157 >