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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 >Output Formats</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="PREVIOUS"
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13 TITLE="Introduction"
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14 HREF="c13.html"><LINK
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15 REL="NEXT"
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16 TITLE="DECB Binaries"
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17 HREF="x27.html"></HEAD
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18 ><BODY
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19 CLASS="CHAPTER"
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20 BGCOLOR="#FFFFFF"
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21 TEXT="#000000"
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22 LINK="#0000FF"
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23 VLINK="#840084"
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24 ALINK="#0000FF"
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25 ><DIV
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26 CLASS="NAVHEADER"
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27 ><TABLE
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28 SUMMARY="Header navigation table"
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29 WIDTH="100%"
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30 BORDER="0"
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31 CELLPADDING="0"
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32 CELLSPACING="0"
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33 ><TR
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34 ><TH
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35 COLSPAN="3"
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36 ALIGN="center"
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37 >LW Tool Chain</TH
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38 ></TR
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39 ><TR
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40 ><TD
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41 WIDTH="10%"
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43 VALIGN="bottom"
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44 ><A
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45 HREF="c13.html"
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46 ACCESSKEY="P"
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47 >Prev</A
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48 ></TD
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49 ><TD
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50 WIDTH="80%"
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51 ALIGN="center"
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52 VALIGN="bottom"
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53 ></TD
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54 ><TD
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55 WIDTH="10%"
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56 ALIGN="right"
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57 VALIGN="bottom"
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58 ><A
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59 HREF="x27.html"
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60 ACCESSKEY="N"
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61 >Next</A
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62 ></TD
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63 ></TR
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64 ></TABLE
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65 ><HR
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66 ALIGN="LEFT"
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67 WIDTH="100%"></DIV
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68 ><DIV
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69 CLASS="CHAPTER"
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70 ><H1
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71 ><A
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72 NAME="AEN21"
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73 ></A
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74 >Chapter 2. Output Formats</H1
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75 ><P
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76 >The LW tool chain supports multiple output formats. Each format has its
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77 advantages and disadvantages. Each format is described below.</P
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78 ><DIV
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79 CLASS="SECTION"
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80 ><H1
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81 CLASS="SECTION"
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82 ><A
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83 NAME="AEN24"
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84 >2.1. Raw Binaries</A
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85 ></H1
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86 ><P
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87 >A raw binary is simply a string of bytes. There are no headers or other
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88 niceties. Both LWLINK and LWASM support generating raw binaries. ORG directives
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89 in the source code only serve to set the addresses that will be used for
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90 symbols but otherwise have no direct impact on the resulting binary.</P
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91 ></DIV
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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="c13.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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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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125 VALIGN="top"
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126 ><A
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127 HREF="x27.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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136 VALIGN="top"
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137 >Introduction</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 >&nbsp;</TD
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143 ><TD
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144 WIDTH="33%"
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145 ALIGN="right"
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146 VALIGN="top"
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147 >DECB Binaries</TD
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148 ></TR
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149 ></TABLE
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150 ></DIV
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151 ></BODY
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152 ></HTML
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153 >