4066
I spent a while spelunking into the code generated by C compilers before realizing that ignoring the order of arguments for 'cmp' instructions clarifies everything.
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@ -226,7 +226,7 @@ if ('onhashchange' in window) {
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<span id="L161" class="LineNr">161 </span><span class="traceContains">+run: SF=0; ZF=0; OF=0</span>
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<span id="L162" class="LineNr">162 </span>
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<span id="L163" class="LineNr">163 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
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<span id="L164" class="LineNr">164 </span><span class="Normal">case</span> <span class="Constant">0x39</span>: <span class="Delimiter">{</span> <span class="Comment">// compare r32 with r/m32</span>
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<span id="L164" class="LineNr">164 </span><span class="Normal">case</span> <span class="Constant">0x39</span>: <span class="Delimiter">{</span> <span class="Comment">// set SF if r/m32 < r32</span>
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<span id="L165" class="LineNr">165 </span> <span class="Normal">uint8_t</span> modrm = <a href='010core.cc.html#L210'>next</a><span class="Delimiter">();</span>
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<span id="L166" class="LineNr">166 </span> <span class="Normal">uint8_t</span> reg2 = <span class="Delimiter">(</span>modrm>><span class="Constant">3</span><span class="Delimiter">)</span>&<span class="Constant">0x7</span><span class="Delimiter">;</span>
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<span id="L167" class="LineNr">167 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"compare <a href='010core.cc.html#L15'>reg</a> "</span> << <a href='010core.cc.html#L228'>NUM</a><span class="Delimiter">(</span>reg2<span class="Delimiter">)</span> << <span class="Constant">" with effective address"</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
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@ -302,7 +302,7 @@ if ('onhashchange' in window) {
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<span id="L238" class="LineNr">238 </span><span class="traceContains">+run: SF=0; ZF=0; OF=0</span>
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<span id="L239" class="LineNr">239 </span>
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<span id="L240" class="LineNr">240 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
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<span id="L241" class="LineNr">241 </span><span class="Normal">case</span> <span class="Constant">0x3b</span>: <span class="Delimiter">{</span> <span class="Comment">// compare r/m32 with r32</span>
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<span id="L241" class="LineNr">241 </span><span class="Normal">case</span> <span class="Constant">0x3b</span>: <span class="Delimiter">{</span> <span class="Comment">// set SF if r32 < r/m32</span>
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<span id="L242" class="LineNr">242 </span> <span class="Normal">uint8_t</span> modrm = <a href='010core.cc.html#L210'>next</a><span class="Delimiter">();</span>
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<span id="L243" class="LineNr">243 </span> <span class="Normal">uint8_t</span> reg1 = <span class="Delimiter">(</span>modrm>><span class="Constant">3</span><span class="Delimiter">)</span>&<span class="Constant">0x7</span><span class="Delimiter">;</span>
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<span id="L244" class="LineNr">244 </span> <a href='003trace.cc.html#L160'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"compare effective address with <a href='010core.cc.html#L15'>reg</a> "</span> << <a href='010core.cc.html#L228'>NUM</a><span class="Delimiter">(</span>reg1<span class="Delimiter">)</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
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@ -161,7 +161,7 @@ case 0xf7: { // xor r32 with r/m32
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+run: SF=0; ZF=0; OF=0
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:(before "End Single-Byte Opcodes")
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case 0x39: { // compare r32 with r/m32
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case 0x39: { // set SF if r/m32 < r32
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uint8_t modrm = next();
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uint8_t reg2 = (modrm>>3)&0x7;
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trace(2, "run") << "compare reg " << NUM(reg2) << " with effective address" << end();
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@ -238,7 +238,7 @@ case 0x33: { // xor r/m32 with r32
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+run: SF=0; ZF=0; OF=0
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:(before "End Single-Byte Opcodes")
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case 0x3b: { // compare r/m32 with r32
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case 0x3b: { // set SF if r32 < r/m32
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uint8_t modrm = next();
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uint8_t reg1 = (modrm>>3)&0x7;
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trace(2, "run") << "compare effective address with reg " << NUM(reg1) << end();
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