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<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: operating directly on a register</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span><span class="Delimiter">:(scenario add_r32_to_r32)</span>
<span id="L4" class="LineNr"> 4 </span><span class="Special">% Reg[0].i = 0x10;</span>
<span id="L5" class="LineNr"> 5 </span><span class="Special">% Reg[3].i = 1;</span>
<span id="L6" class="LineNr"> 6 </span><span class="Comment"># op ModR/M SIB displacement immediate</span>
<span id="L7" class="LineNr"> 7 </span> <span class="PreProc">0</span><span class="Constant">1</span> d8 <span class="Comment"># add EBX (reg 3) to EAX (reg 0)</span>
<span id="L8" class="LineNr"> 8 </span><span class="traceContains">+run: add <a href='010core.cc.html#L15'>reg</a> 3 to effective address</span>
<span id="L9" class="LineNr"> 9 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L15'>reg</a> 0</span>
<span id="L10" class="LineNr"> 10 </span><span class="traceContains">+run: storing 0x00000011</span>
<span id="L11" class="LineNr"> 11 </span>
<span id="L12" class="LineNr"> 12 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L13" class="LineNr"> 13 </span><span class="Normal">case</span> <span class="Constant">0x01</span>: <span class="Delimiter">{</span> <span class="Comment">// add r32 to r/m32</span>
<span id="L14" class="LineNr"> 14 </span> <span class="Normal">uint8_t</span> modrm = <a href='010core.cc.html#L210'>next</a><span class="Delimiter">();</span>
<span id="L15" class="LineNr"> 15 </span> <span class="Normal">uint8_t</span> arg2 = <span class="Delimiter">(</span>modrm>><span class="Constant">3</span><span class="Delimiter">)</span>&<span class="Constant">0x7</span><span class="Delimiter">;</span>
<span id="L16" class="LineNr"> 16 </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">"add <a href='010core.cc.html#L15'>reg</a> "</span> << <a href='010core.cc.html#L228'>NUM</a><span class="Delimiter">(</span>arg2<span class="Delimiter">)</span> << <span class="Constant">" to effective address"</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L17" class="LineNr"> 17 </span> <span class="Normal">int32_t</span>* arg1 = <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
<span id="L18" class="LineNr"> 18 </span> <a href='010core.cc.html#L41'>BINARY_ARITHMETIC_OP</a><span class="Delimiter">(</span>+<span class="Delimiter">,</span> *arg1<span class="Delimiter">,</span> Reg[arg2]<span class="Delimiter">.</span><a href='010core.cc.html#L16'>i</a><span class="Delimiter">);</span>
<span id="L19" class="LineNr"> 19 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L20" class="LineNr"> 20 </span><span class="Delimiter">}</span>
<span id="L21" class="LineNr"> 21 </span>
<span id="L22" class="LineNr"> 22 </span><span class="Delimiter">:(code)</span>
<span id="L23" class="LineNr"> 23 </span><span class="Comment">// Implement tables 2-2 and 2-3 in the Intel manual, Volume 2.</span>
<span id="L24" class="LineNr"> 24 </span><span class="Comment">// We return a pointer so that instructions can write to multiple bytes in</span>
<span id="L25" class="LineNr"> 25 </span><span class="Comment">// 'Mem' at once.</span>
<span id="L26" class="LineNr"> 26 </span><span class="Normal">int32_t</span>* <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span><span class="Normal">uint8_t</span> modrm<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L27" class="LineNr"> 27 </span> <span class="Normal">uint8_t</span> mod = <span class="Delimiter">(</span>modrm>><span class="Constant">6</span><span class="Delimiter">);</span>
<span id="L28" class="LineNr"> 28 </span> <span class="Comment">// ignore middle 3 'reg opcode' bits</span>
<span id="L29" class="LineNr"> 29 </span> <span class="Normal">uint8_t</span> rm = modrm & <span class="Constant">0x7</span><span class="Delimiter">;</span>
<span id="L30" class="LineNr"> 30 </span> <span class="Normal">int32_t</span>* result = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L31" class="LineNr"> 31 </span> <span class="Normal">switch</span> <span class="Delimiter">(</span>mod<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L32" class="LineNr"> 32 </span> <span class="Normal">case</span> <span class="Constant">3</span>:
<span id="L33" class="LineNr"> 33 </span> <span class="Conceal">¦</span> <span class="Comment">// mod 3 is just register direct addressing</span>
<span id="L34" class="LineNr"> 34 </span> <span class="Conceal">¦</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">"effective address is <a href='010core.cc.html#L15'>reg</a> "</span> << <a href='010core.cc.html#L228'>NUM</a><span class="Delimiter">(</span>rm<span class="Delimiter">)</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L35" class="LineNr"> 35 </span> <span class="Conceal">¦</span> result = &Reg[rm]<span class="Delimiter">.</span><a href='010core.cc.html#L16'>i</a><span class="Delimiter">;</span>
<span id="L36" class="LineNr"> 36 </span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L37" class="LineNr"> 37 </span> <span class="Comment">// End Mod Special-cases</span>
<span id="L38" class="LineNr"> 38 </span> <span class="Normal">default</span>:
<span id="L39" class="LineNr"> 39 </span> <span class="Conceal">¦</span> cerr << <span class="Constant">"unrecognized mod bits: "</span> << <a href='010core.cc.html#L228'>NUM</a><span class="Delimiter">(</span>mod<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L40" class="LineNr"> 40 </span> <span class="Conceal">¦</span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L41" class="LineNr"> 41 </span> <span class="Delimiter">}</span>
<span id="L42" class="LineNr"> 42 </span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L43" class="LineNr"> 43 </span><span class="Delimiter">}</span>
<span id="L44" class="LineNr"> 44 </span>
<span id="L45" class="LineNr"> 45 </span><span class="SalientComment">//:: subtract</span>
<span id="L46" class="LineNr"> 46 </span>
<span id="L47" class="LineNr"> 47 </span><span class="Delimiter">:(scenario subtract_r32_from_r32)</span>
<span id="L48" class="LineNr"> 48 </span><span class="Special">% Reg[0].i = 10;</span>
<span id="L49" class="LineNr"> 49 </span><span class="Special">% Reg[3].i = 1;</span>
<span id="L50" class="LineNr"> 50 </span><span class="Comment"># op ModR/M SIB displacement immediate</span>
<span id="L51" class="LineNr"> 51 </span> <span class="Constant">29</span> d8 <span class="Comment"># subtract EBX (reg 3) from EAX (reg 0)</span>
<span id="L52" class="LineNr"> 52 </span><span class="traceContains">+run: subtract <a href='010core.cc.html#L15'>reg</a> 3 from effective address</span>
<span id="L53" class="LineNr"> 53 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L15'>reg</a> 0</span>
<span id="L54" class="LineNr"> 54 </span><span class="traceContains">+run: storing 0x00000009</span>
<span id="L55" class="LineNr"> 55 </span>
<span id="L56" class="LineNr"> 56 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L57" class="LineNr"> 57 </span><span class="Normal">case</span> <span class="Constant">0x29</span>: <span class="Delimiter">{</span> <span class="Comment">// subtract r32 from r/m32</span>
<span id="L58" class="LineNr"> 58 </span> <span class="Normal">uint8_t</span> modrm = <a href='010core.cc.html#L210'>next</a><span class="Delimiter">();</span>
<span id="L59" class="LineNr"> 59 </span> <span class="Normal">uint8_t</span> arg2 = <span class="Delimiter">(</span>modrm>><span class="Constant">3</span><span class="Delimiter">)</span>&<span class="Constant">0x7</span><span class="Delimiter">;</span>
<span id="L60" class="LineNr"> 60 </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">"subtract <a href='010core.cc.html#L15'>reg</a> "</span> << <a href='010core.cc.html#L228'>NUM</a><span class="Delimiter">(</span>arg2<span class="Delimiter">)</span> << <span class="Constant">" from effective address"</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L61" class="LineNr"> 61 </span> <span class="Normal">int32_t</span>* arg1 = <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
<span id="L62" class="LineNr"> 62 </span> <a href='010core.cc.html#L41'>BINARY_ARITHMETIC_OP</a><span class="Delimiter">(</span>-<span class="Delimiter">,</span> *arg1<span class="Delimiter">,</span> Reg[arg2]<span class="Delimiter">.</span><a href='010core.cc.html#L16'>i</a><span class="Delimiter">);</span>
<span id="L63" class="LineNr"> 63 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L64" class="LineNr"> 64 </span><span class="Delimiter">}</span>
<span id="L65" class="LineNr"> 65 </span>
<span id="L66" class="LineNr"> 66 </span><span class="SalientComment">//:: and</span>
<span id="L67" class="LineNr"> 67 </span>
<span id="L68" class="LineNr"> 68 </span><span class="Delimiter">:(scenario and_r32_with_r32)</span>
<span id="L69" class="LineNr"> 69 </span><span class="Special">% Reg[0].i = 0x0a0b0c0d;</span>
<span id="L70" class="LineNr"> 70 </span><span class="Special">% Reg[3].i = 0x000000ff;</span>
<span id="L71" class="LineNr"> 71 </span><span class="Comment"># op ModR/M SIB displacement immediate</span>
<span id="L72" class="LineNr"> 72 </span> <span class="Constant">21</span> d8 <span class="Comment"># and EBX (reg 3) with destination EAX (reg 0)</span>
<span id="L73" class="LineNr"> 73 </span><span class="traceContains">+run: and <a href='010core.cc.html#L15'>reg</a> 3 with effective address</span>
<span id="L74" class="LineNr"> 74 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L15'>reg</a> 0</span>
<span id="L75" class="LineNr"> 75 </span><span class="traceContains">+run: storing 0x0000000d</span>
<span id="L76" class="LineNr"> 76 </span>
<span id="L77" class="LineNr"> 77 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L78" class="LineNr"> 78 </span><span class="Normal">case</span> <span class="Constant">0x21</span>: <span class="Delimiter">{</span> <span class="Comment">// and r32 with r/m32</span>
<span id="L79" class="LineNr"> 79 </span> <span class="Normal">uint8_t</span> modrm = <a href='010core.cc.html#L210'>next</a><span class="Delimiter">();</span>
<span id="L80" class="LineNr"> 80 </span> <span class="Normal">uint8_t</span> arg2 = <span class="Delimiter">(</span>modrm>><span class="Constant">3</span><span class="Delimiter">)</span>&<span class="Constant">0x7</span><span class="Delimiter">;</span>
<span id="L81" class="LineNr"> 81 </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">"and <a href='010core.cc.html#L15'>reg</a> "</span> << <a href='010core.cc.html#L228'>NUM</a><span class="Delimiter">(</span>arg2<span class="Delimiter">)</span> << <span class="Constant">" with effective address"</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L82" class="LineNr"> 82 </span> <span class="Normal">int32_t</span>* arg1 = <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
<span id="L83" class="LineNr"> 83 </span> <a href='010core.cc.html#L53'>BINARY_BITWISE_OP</a><span class="Delimiter">(</span>&<span class="Delimiter">,</span> *arg1<span class="Delimiter">,</span> Reg[arg2]<span class="Delimiter">.</span><a href='010core.cc.html#L17'>u</a><span class="Delimiter">);</span>
<span id="L84" class="LineNr"> 84 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L85" class="LineNr"> 85 </span><span class="Delimiter">}</span>
<span id="L86" class="LineNr"> 86 </span>
<span id="L87" class="LineNr"> 87 </span><span class="SalientComment">//:: or</span>
<span id="L88" class="LineNr"> 88 </span>
<span id="L89" class="LineNr"> 89 </span><span class="Delimiter">:(scenario or_r32_with_r32)</span>
<span id="L90" class="LineNr"> 90 </span><span class="Special">% Reg[0].i = 0x0a0b0c0d;</span>
<span id="L91" class="LineNr"> 91 </span><span class="Special">% Reg[3].i = 0xa0b0c0d0;</span>
<span id="L92" class="LineNr"> 92 </span><span class="Comment"># op ModR/M SIB displacement immediate</span>
<span id="L93" class="LineNr"> 93 </span> <span class="Error">09</span> d8 <span class="Comment"># or EBX (reg 3) with destination EAX (reg 0)</span>
<span id="L94" class="LineNr"> 94 </span><span class="traceContains">+run: or <a href='010core.cc.html#L15'>reg</a> 3 with effective address</span>
<span id="L95" class="LineNr"> 95 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L15'>reg</a> 0</span>
<span id="L96" class="LineNr"> 96 </span><span class="traceContains">+run: storing 0xaabbccdd</span>
<span id="L97" class="LineNr"> 97 </span>
<span id="L98" class="LineNr"> 98 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L99" class="LineNr"> 99 </span><span class="Normal">case</span> <span class="Constant">0x09</span>: <span class="Delimiter">{</span> <span class="Comment">// or r32 with r/m32</span>
<span id="L100" class="LineNr">100 </span> <span class="Normal">uint8_t</span> modrm = <a href='010core.cc.html#L210'>next</a><span class="Delimiter">();</span>
<span id="L101" class="LineNr">101 </span> <span class="Normal">uint8_t</span> arg2 = <span class="Delimiter">(</span>modrm>><span class="Constant">3</span><span class="Delimiter">)</span>&<span class="Constant">0x7</span><span class="Delimiter">;</span>
<span id="L102" class="LineNr">102 </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">"or <a href='010core.cc.html#L15'>reg</a> "</span> << <a href='010core.cc.html#L228'>NUM</a><span class="Delimiter">(</span>arg2<span class="Delimiter">)</span> << <span class="Constant">" with effective address"</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L103" class="LineNr">103 </span> <span class="Normal">int32_t</span>* arg1 = <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
<span id="L104" class="LineNr">104 </span> <a href='010core.cc.html#L53'>BINARY_BITWISE_OP</a><span class="Delimiter">(</span>|<span class="Delimiter">,</span> *arg1<span class="Delimiter">,</span> Reg[arg2]<span class="Delimiter">.</span><a href='010core.cc.html#L17'>u</a><span class="Delimiter">);</span>
<span id="L105" class="LineNr">105 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L106" class="LineNr">106 </span><span class="Delimiter">}</span>
<span id="L107" class="LineNr">107 </span>
<span id="L108" class="LineNr">108 </span><span class="SalientComment">//:: xor</span>
<span id="L109" class="LineNr">109 </span>
<span id="L110" class="LineNr">110 </span><span class="Delimiter">:(scenario xor_r32_with_r32)</span>
<span id="L111" class="LineNr">111 </span><span class="Special">% Reg[0].i = 0x0a0b0c0d;</span>
<span id="L112" class="LineNr">112 </span><span class="Special">% Reg[3].i = 0xaabbc0d0;</span>
<span id="L113" class="LineNr">113 </span><span class="Comment"># op ModR/M SIB displacement immediate</span>
<span id="L114" class="LineNr">114 </span> <span class="Constant">31</span> d8 <span class="Comment"># xor EBX (reg 3) with destination EAX (reg 0)</span>
<span id="L115" class="LineNr">115 </span><span class="traceContains">+run: xor <a href='010core.cc.html#L15'>reg</a> 3 with effective address</span>
<span id="L116" class="LineNr">116 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L15'>reg</a> 0</span>
<span id="L117" class="LineNr">117 </span><span class="traceContains">+run: storing 0xa0b0ccdd</span>
<span id="L118" class="LineNr">118 </span>
<span id="L119" class="LineNr">119 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L120" class="LineNr">120 </span><span class="Normal">case</span> <span class="Constant">0x31</span>: <span class="Delimiter">{</span> <span class="Comment">// xor r32 with r/m32</span>
<span id="L121" class="LineNr">121 </span> <span class="Normal">uint8_t</span> modrm = <a href='010core.cc.html#L210'>next</a><span class="Delimiter">();</span>
<span id="L122" class="LineNr">122 </span> <span class="Normal">uint8_t</span> arg2 = <span class="Delimiter">(</span>modrm>><span class="Constant">3</span><span class="Delimiter">)</span>&<span class="Constant">0x7</span><span class="Delimiter">;</span>
<span id="L123" class="LineNr">123 </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">"xor <a href='010core.cc.html#L15'>reg</a> "</span> << <a href='010core.cc.html#L228'>NUM</a><span class="Delimiter">(</span>arg2<span class="Delimiter">)</span> << <span class="Constant">" with effective address"</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L124" class="LineNr">124 </span> <span class="Normal">int32_t</span>* arg1 = <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
<span id="L125" class="LineNr">125 </span> <a href='010core.cc.html#L53'>BINARY_BITWISE_OP</a><span class="Delimiter">(</span>^<span class="Delimiter">,</span> *arg1<span class="Delimiter">,</span> Reg[arg2]<span class="Delimiter">.</span><a href='010core.cc.html#L17'>u</a><span class="Delimiter">);</span>
<span id="L126" class="LineNr">126 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L127" class="LineNr">127 </span><span class="Delimiter">}</span>
<span id="L128" class="LineNr">128 </span>
<span id="L129" class="LineNr">129 </span><span class="SalientComment">//:: not</span>
<span id="L130" class="LineNr">130 </span>
<span id="L131" class="LineNr">131 </span><span class="Delimiter">:(scenario not_r32)</span>
<span id="L132" class="LineNr">132 </span><span class="Special">% Reg[3].i = 0x0f0f00ff;</span>
<span id="L133" class="LineNr">133 </span><span class="Comment"># op ModR/M SIB displacement immediate</span>
<span id="L134" class="LineNr">134 </span> f7 c3 <span class="Comment"># not EBX (reg 3)</span>
<span id="L135" class="LineNr">135 </span><span class="traceContains">+run: 'not' of effective address</span>
<span id="L136" class="LineNr">136 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L15'>reg</a> 3</span>
<span id="L137" class="LineNr">137 </span><span class="traceContains">+run: storing 0xf0f0ff00</span>
<span id="L138" class="LineNr">138 </span>
<span id="L139" class="LineNr">139 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L140" class="LineNr">140 </span><span class="Normal">case</span> <span class="Constant">0xf7</span>: <span class="Delimiter">{</span> <span class="Comment">// xor r32 with r/m32</span>
<span id="L141" class="LineNr">141 </span> <span class="Normal">uint8_t</span> modrm = <a href='010core.cc.html#L210'>next</a><span class="Delimiter">();</span>
<span id="L142" class="LineNr">142 </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">"'not' of effective address"</span> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L143" class="LineNr">143 </span> <span class="Normal">int32_t</span>* arg1 = <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
<span id="L144" class="LineNr">144 </span> *arg1 = ~<span class="Delimiter">(</span>*arg1<span class="Delimiter">);</span>
<span id="L145" class="LineNr">145 </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">"storing 0x"</span> << <a href='010core.cc.html#L226'>HEXWORD</a> << *arg1 << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L146" class="LineNr">146 </span> SF = <span class="Delimiter">(</span>*arg1 >> <span class="Constant">31</span><span class="Delimiter">);</span>
<span id="L147" class="LineNr">147 </span> <a href='010core.cc.html#L30'>ZF</a> = <span class="Delimiter">(</span>*arg1 == <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L148" class="LineNr">148 </span> <a href='010core.cc.html#L31'>OF</a> = <span class="Constant">false</span><span class="Delimiter">;</span>
<span id="L149" class="LineNr">149 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L150" class="LineNr">150 </span><span class="Delimiter">}</span>
<span id="L151" class="LineNr">151 </span>
<span id="L152" class="LineNr">152 </span><span class="SalientComment">//:: compare</span>
<span id="L153" class="LineNr">153 </span>
<span id="L154" class="LineNr">154 </span><span class="Delimiter">:(scenario compare_r32_with_r32_greater)</span>
<span id="L155" class="LineNr">155 </span><span class="Special">% Reg[0].i = 0x0a0b0c0d;</span>
<span id="L156" class="LineNr">156 </span><span class="Special">% Reg[3].i = 0x0a0b0c07;</span>
<span id="L157" class="LineNr">157 </span><span class="Comment"># op ModRM SIB displacement immediate</span>
<span id="L158" class="LineNr">158 </span> <span class="Constant">39</span> d8 <span class="Comment"># compare EBX (reg 3) with EAX (reg 0)</span>
<span id="L159" class="LineNr">159 </span><span class="traceContains">+run: compare <a href='010core.cc.html#L15'>reg</a> 3 with effective address</span>
<span id="L160" class="LineNr">160 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L15'>reg</a> 0</span>
<span id="L161" class="LineNr">161 </span><span class="traceContains">+run: SF=0; ZF=0; OF=0</span>
<span id="L162" class="LineNr">162 </span>
<span id="L163" class="LineNr">163 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<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>
<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>
<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>
<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>
<span id="L168" class="LineNr">168 </span> <span class="Normal">int32_t</span>* arg1 = <a href='011direct_addressing.cc.html#L26'>effective_address</a><span class="Delimiter">(</span>modrm<span class="Delimiter">);</span>
<span id="L169" class="LineNr">169 </span> <span class="Normal">int32_t</span> arg2 = Reg[reg2]<span class="Delimiter">.</span><a href='010core.cc.html#L16'>i</a><span class="Delimiter">;</span>
<span id="L170" class="LineNr">170 </span> <span class="Normal">int32_t</span> tmp1 = *arg1 - arg2<span class="Delimiter">;</span>
<span id="L171" class="LineNr">171 </span> SF = <span class="Delimiter">(</span>tmp1 < <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L172" class="LineNr">172 </span> <a href='010core.cc.html#L30'>ZF</a> = <span class="Delimiter">(</span>tmp1 == <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L173" class="LineNr">173 </span> <span class="Normal">int64_t</span> tmp2 = *arg1 - arg2<span class="Delimiter">;</span>
<span id="L174" class="LineNr">174 </span> <a href='010core.cc.html#L31'>OF</a> = <span class="Delimiter">(</span>tmp1 != tmp2<span class="Delimiter">);</span>
<span id="L175" class="LineNr">175 </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">"SF="</span> << SF << <span class="Constant">"; ZF="</span> << <a href='010core.cc.html#L30'>ZF</a> << <span class="Constant">"; OF="</span> << <a href='010core.cc.html#L31'>OF</a> << <a href='003trace.cc.html#L184'>end</a><span class="Delimiter">();</span>
<span id="L176" class="LineNr">176 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L177" class="LineNr">177 </span><span class="Delimiter">}</span>
<span id="L178" class="LineNr">178 </span>
<span id="L179" class="LineNr">179 </span><span class="Delimiter">:(scenario compare_r32_with_r32_lesser)</span>
<span id="L180" class="LineNr">180 </span><span class="Special">% Reg[0].i = 0x0a0b0c07;</span>
<span id="L181" class="LineNr">181 </span><span class="Special">% Reg[3].i = 0x0a0b0c0d;</span>
<span id="L182" class="LineNr">182 </span><span class="Comment"># op ModRM SIB displacement immediate</span>
<span id="L183" class="LineNr">183 </span> <span class="Constant">39</span> d8 <span class="Comment"># compare EBX (reg 3) with EAX (reg 0)</span>
<span id="L184" class="LineNr">184 </span><span class="traceContains">+run: compare <a href='010core.cc.html#L15'>reg</a> 3 with effective address</span>
<span id="L185" class="LineNr">185 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L15'>reg</a> 0</span>
<span id="L186" class="LineNr">186 </span><span class="traceContains">+run: SF=1; ZF=0; OF=0</span>
<span id="L187" class="LineNr">187 </span>
<span id="L188" class="LineNr">188 </span><span class="Delimiter">:(scenario compare_r32_with_r32_equal)</span>
<span id="L189" class="LineNr">189 </span><span class="Special">% Reg[0].i = 0x0a0b0c0d;</span>
<span id="L190" class="LineNr">190 </span><span class="Special">% Reg[3].i = 0x0a0b0c0d;</span>
<span id="L191" class="LineNr">191 </span><span class="Comment"># op ModRM SIB displacement immediate</span>
<span id="L192" class="LineNr">192 </span> <span class="Constant">39</span> d8 <span class="Comment"># compare EBX (reg 3) with EAX (reg 0)</span>
<span id="L193" class="LineNr">193 </span><span class="traceContains">+run: compare <a href='010core.cc.html#L15'>reg</a> 3 with effective address</span>
<span id="L194" class="LineNr">194 </span><span class="traceContains">+run: effective address is <a href='010core.cc.html#L15'>reg</a> 0</span>
<span id="L195" class="LineNr">195 </span><span class="traceContains">+run: SF=0; ZF=1; OF=0</span>
</pre>
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