annotate docs/manual/x36.html @ 434:052c5f335a92

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 e95f07cbce4e
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 >Motorola S-Record</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="ASCII Hexadecimal"
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17 HREF="x32.html"><LINK
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18 REL="NEXT"
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19 TITLE="Intel Hex"
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20 HREF="x41.html"></HEAD
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21 ><BODY
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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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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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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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47 ><A
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48 HREF="x32.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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55 VALIGN="bottom"
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56 >Chapter 2. Output Formats</TD
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57 ><TD
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61 ><A
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62 HREF="x41.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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70 WIDTH="100%"></DIV
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73 ><H1
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75 ><A
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76 NAME="AEN36"
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77 >2.4. Motorola S-Record</A
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78 ></H1
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79 ><P
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80 >This ASCII format consists of a series of CR+LF terminated "records" of ASCII
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81 text. Each record has the following structure: a start-of-record character
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82 "S", an ASCII record type digit (0-9), a two-digit ASCII hex byte count, a
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83 four-digit ASCII hex address, an optional sequence of two-digit ASCII hex data
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84 values, and a two-digit ASCII hex checksum. The LW tool chain issues only S0,
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85 S1, S5 and S9 record types. S1 records are limited to maximum of 16 data bytes
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86 in length, and paragraph alignment of addresses is favored. The address
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87 sequence of the S-Records directly follows that of the source file; multiple
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88 ORG directives in the source code may result in out-of-sequence addresses in
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89 the S-Record output. </P
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90 ><P
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91 >Motorola S-Record format is a standard ASCII format accepted by most memory
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92 device programming equipment. It is particularly useful when the assembled
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93 code output is destined to reside within an EPROM or Flash memory device,
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94 for example.</P
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95 ><P
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96 >LWASM can output this format since version 4.10. LWLINK can output this format
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97 since version 4.11.</P
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98 ></DIV
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99 ><DIV
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100 CLASS="NAVFOOTER"
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101 ><HR
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103 WIDTH="100%"><TABLE
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104 SUMMARY="Footer navigation table"
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109 ><TR
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113 VALIGN="top"
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114 ><A
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115 HREF="x32.html"
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116 ACCESSKEY="P"
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117 >Prev</A
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118 ></TD
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119 ><TD
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123 ><A
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125 ACCESSKEY="H"
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126 >Home</A
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127 ></TD
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132 ><A
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133 HREF="x41.html"
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134 ACCESSKEY="N"
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135 >Next</A
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136 ></TD
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137 ></TR
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138 ><TR
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139 ><TD
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142 VALIGN="top"
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143 >ASCII Hexadecimal</TD
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144 ><TD
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148 ><A
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149 HREF="c21.html"
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150 ACCESSKEY="U"
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151 >Up</A
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152 ></TD
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153 ><TD
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157 >Intel Hex</TD
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William Astle <lost@l-w.ca>
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158 ></TR
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159 ></TABLE
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160 ></DIV
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161 ></BODY
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162 ></HTML
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163 >