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<title>PCMPGTB/PCMPGTW/PCMPGTD: Compare Packed Signed Integers for Greater Than (x86 Instruction Set Reference)</title>
</head>
<body>
<div class="main_container"><h1>x86 Instruction Set Reference</h1>
<title>PCMPGTB/PCMPGTW/PCMPGTD: Compare Packed Signed Integers for Greater Than (x86 Instruction Set Reference)</title>
<h1>PCMPGTB/PCMPGTW/PCMPGTD</h1>
<h2>Compare Packed Signed Integers for Greater Than</h2>
<object>
<table class="box">
<tr>
<th>Opcode</th>
<th>Mnemonic</th>
<th>Description</th>
</tr>
<tr>
<td class="grid"><code>0F 64 /r</code></td>
<td class="grid"><code>PCMPGTB mm, mm/m64</code></td>
<td class="grid">Compare packed signed byte integers in mm and mm/m64 for greater than.</td>
</tr>
<tr>
<td class="grid"><code>66 0F 64 /r</code></td>
<td class="grid"><code>PCMPGTB xmm1, xmm2/m128</code></td>
<td class="grid">Compare packed signed byte integers in xmm1 and xmm2/m128 for greater than.</td>
</tr>
<tr>
<td class="grid"><code>0F 65 /r</code></td>
<td class="grid"><code>PCMPGTW mm, mm/m64</code></td>
<td class="grid">Compare packed signed word integers in mm and mm/m64 for greater than.</td>
</tr>
<tr>
<td class="grid"><code>66 0F 65 /r</code></td>
<td class="grid"><code>PCMPGTW xmm1, xmm2/m128</code></td>
<td class="grid">Compare packed signed word integers in xmm1 and xmm2/m128 for greater than.</td>
</tr>
<tr>
<td class="grid"><code>0F 66 /r</code></td>
<td class="grid"><code>PCMPGTD mm, mm/m64</code></td>
<td class="grid">Compare packed signed doubleword integers in mm and mm/m64 for greater than.</td>
</tr>
<tr>
<td class="grid"><code>66 0F 66 /r</code></td>
<td class="grid"><code>PCMPGTD xmm1, xmm2/m128</code></td>
<td class="grid">Compare packed signed doubleword integers in xmm1 and xmm2/m128 for greater than.</td>
</tr>
</table>
</object>
<object>
<table class="box">
<tr>
<th>Description</th>
</tr>
<tr>
<td class="instruction_set_reference_box">
<p>Performs an SIMD signed compare for the greater value of the packed byte, word, or doubleword integers in the destination operand (first operand) and the source operand (second operand). If a data element in the destination operand is greater than the corresponding date element in the source operand, the corresponding data element in the destination operand is set to all 1s; otherwise, it is set to all 0s. The source operand can be an MMX technology register or a 64-bit memory location, or it can be an XMM register or a 128-bit memory location. The destination operand can be an MMX technology register or an XMM register.</p>
<p>The PCMPGTB instruction compares the corresponding signed byte integers in the destination and source operands; the PCMPGTW instruction compares the corresponding signed word integers in the destination and source operands; and the PCMPGTD instruction compares the corresponding signed doubleword integers in the destination and source operands.</p>
</td>
</tr>
</table>
</object>
<object>
<table class="box">
<tr>
<th>Operation</th>
</tr>
<tr>
<td class="instruction_set_reference_box">
<pre><span class="keyword">if</span><span class="operator">(</span>Instruction<span class="operator">)</span> {
	<span class="keyword">case</span> PCMPGTB<span class="operator">:</span>
		<span class="keyword">if</span><span class="operator">(</span>OperandSize <span class="operator">==</span> <span class="number">64</span><span class="operator">)</span> {
			<span class="comment">//PCMPGTB instruction with 64-bit operands:</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">0..7</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">0..7</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">0..7</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">0..7</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">8..15</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">8..15</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">8..15</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">8..15</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">16..23</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">16..23</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">16..23</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">16..23</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">24..31</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">24..31</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">24..31</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">24..31</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">32..39</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">32..39</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">32..39</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">32..39</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">40..47</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">40..47</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">40..47</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">40..47</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">48..55</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">48..55</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">48..55</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">48..55</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">56..63</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">56..63</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">56..63</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">56..63</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
		}
		<span class="keyword">else</span> {
			<span class="comment">//PCMPGTB instruction with 128-bit operands:</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">0..7</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">0..7</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">0..7</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">0..7</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">8..15</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">8..15</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">8..15</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">8..15</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">16..23</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">16..23</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">16..23</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">16..23</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">24..31</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">24..31</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">24..31</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">24..31</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">32..39</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">32..39</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">32..39</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">32..39</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">40..47</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">40..47</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">40..47</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">40..47</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">48..55</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">48..55</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">48..55</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">48..55</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">56..63</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">56..63</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">56..63</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">56..63</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">64..71</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">64..71</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">64..71</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">64..71</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">72..79</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">72..79</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">72..79</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">72..79</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">80..87</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">80..87</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">80..87</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">80..87</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">88..95</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">88..95</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">88..95</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">88..95</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">96..103</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">96..103</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">96..103</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">96..103</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">104..111</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">104..111</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">104..111</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">104..111</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">112..119</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">112..119</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">112..119</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">112..119</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">120..127</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">120..127</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">120..127</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">120..127</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
		<span class="keyword">break</span><span class="operator">;</span>
	<span class="keyword">case</span> PCMPGTW<span class="operator">:</span>
		<span class="keyword">if</span><span class="operator">(</span>OperandSize <span class="operator">==</span> <span class="number">64</span><span class="operator">)</span> {
			<span class="comment">//PCMPGTW instruction with 64-bit operands:</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">0..15</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">0..15</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">0..15</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">0..15</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">16..31</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">16..31</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">16..31</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">16..31</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">32..47</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">32..47</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">32..47</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">32..47</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">48..63</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">48..63</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">48..63</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">48..63</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
		}
		<span class="keyword">else</span> {
			<span class="comment">//PCMPGTW instruction with 128-bit operands:</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">0..15</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">0..15</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">0..15</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">0..15</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">16..31</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">16..31</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">16..31</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">16..31</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">32..47</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">32..47</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">32..47</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">32..47</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">48..63</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">48..63</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">48..63</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">48..63</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">64..79</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">64..79</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">64..79</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">64..79</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">80..95</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">80..95</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">80..95</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">80..95</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">96..111</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">96..111</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">96..111</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">96..111</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">112..127</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">112..127</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">112..127</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">112..127</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
		}
		<span class="keyword">break</span><span class="operator">:</span>
	<span class="keyword">case</span> PCMPGTD<span class="operator">:</span>
		<span class="keyword">if</span><span class="operator">(</span>OperandSize <span class="operator">==</span> <span class="number">64</span><span class="operator">)</span> {
			<span class="comment">//PCMPGTD instruction with 64-bit operands:</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">0..31</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">0..31</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">0..31</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFFFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">0..31</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">32..63</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">32..63</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">32..63</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFFFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">32..63</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
		}
		<span class="keyword">else</span> {
			<span class="comment">//PCMPGTD instruction with 128-bit operands:</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">0..31</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">0..31</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">0..31</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFFFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">0..31</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">32..63</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">32..63</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">32..63</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFFFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">32..63</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">64..95</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">64..95</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">64..95</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFFFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">64..95</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
			<span class="keyword">if</span><span class="operator">(</span>Destination<span class="operator">[</span><span class="number">96..127</span><span class="operator">]</span> <span class="operator">&gt;</span> Source<span class="operator">[</span><span class="number">96..127</span><span class="operator">]</span><span class="operator">)</span> Destination<span class="operator">[</span><span class="number">96..127</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0xFFFFFFFF</span><span class="operator">;</span>
			<span class="keyword">else</span> Destination<span class="operator">[</span><span class="number">96..127</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span><span class="operator">;</span>
		}
		<span class="keyword">break</span><span class="operator">;</span>
}
</pre>
</td>
</tr>
</table>
</object>
<object>
<table class="box">
<tr>
<th>Flags affected</th>
</tr>
<tr>
<td class="instruction_set_reference_box">
<p>None.
</p>
</td>
</tr>
</table>
</object>
<object>
<table class="box">
<tr>
<th>Protected Mode Exceptions</th>
</tr>
<tr>
<td class="instruction_set_reference_box">
<div>
<table class="operations_table">
<tr><td><code>#GP(0)</code></td><td>If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit. (128-bit operations only) If a memory operand is not aligned on a 16-byte boundary, regardless of segment.</td></tr>
<tr><td><code>#GP(0)</code></td><td>If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit. (128-bit operations only) If a memory operand is not aligned on a 16-byte boundary, regardless of segment.</td></tr>
<tr><td><code>#SS(0)</code></td><td>If a memory operand effective address is outside the SS segment limit.</td></tr>
<tr><td><code>#UD</code></td><td>If EM in CR0 is set. 128-bit operations will generate #UD only if OSFXSR in CR4 is 0. Execution of 128-bit instructions on a non-SSE2 capable processor (one that is MMX technology capable) will result in the instruction operating on the mm registers, not #UD.</td></tr>
<tr><td><code>#NM</code></td><td>If TS in CR0 is set.</td></tr>
<tr><td><code>#MF</code></td><td>(64-bit operations only) If there is a pending x87 FPU exception.</td></tr>
<tr><td><code>#PF(fault-code)</code></td><td>If a page fault occurs.</td></tr>
</table>
</div>
</td>
</tr>
</table>
</object>
<object>
<table class="box">
<tr>
<th>Real-Address Mode Exceptions</th>
</tr>
<tr>
<td class="instruction_set_reference_box">
<div>
<table class="operations_table">
<tr><td><code>#GP(0)</code></td><td>(128-bit operations only) If a memory operand is not aligned on a 16-byte boundary, regardless of segment. If any part of the operand lies outside of the effective address space from 0 to FFFFH.</td></tr>
<tr><td><code>#GP(0)</code></td><td>(128-bit operations only) If a memory operand is not aligned on a 16-byte boundary, regardless of segment. If any part of the operand lies outside of the effective address space from 0 to FFFFH.</td></tr>
<tr><td><code>#UD</code></td><td>If EM in CR0 is set. 128-bit operations will generate #UD only if OSFXSR in CR4 is 0. Execution of 128-bit instructions on a non-SSE2 capable processor (one that is MMX technology capable) will result in the instruction operating on the mm registers, not #UD.</td></tr>
<tr><td><code>#NM</code></td><td>If TS in CR0 is set.</td></tr>
</table>
</div>
</td>
</tr>
</table>
</object>
<object>
<table class="box">
<tr>
<th>Virtual-8086 Mode Exceptions</th>
</tr>
<tr>
<td class="instruction_set_reference_box">
Same exceptions as in Real Address Mode
<div>
<table class="operations_table">
<tr><td><code>#PF(fault-code)</code></td><td>For a page fault.</td></tr>
<tr><td><code>#PF(fault-code)</code></td><td>For a page fault.</td></tr>
</table>
</div>
</td>
</tr>
</table>
</object>
<object>
<table class="box">
<tr>
<th>Numeric Exceptions</th>
</tr>
<tr>
<td class="instruction_set_reference_box">
None.
</td>
</tr>
</table>
</object>
<object>
<table class="box">
<tr>
<th>Instruction</th>
<th>Latency</th>
<th>Throughput</th>
<th>Execution Unit</th>
</tr>
<tr><td class="grid"><code>CPUID</code></td><td class="grid">0F3n/0F2n/069n</td><td class="grid">0F3n/0F2n/069n</td><td class="grid">0F2n</td></tr>
<tr><td class="grid"><code>PCMPGTB/PCMPGTD/PCMPGTW mm, mm</code></td><td class="grid">2/2/-</td><td class="grid">1/1/-</td><td class="grid">MMX_ALU</td></tr>
<tr><td class="grid"><code>PCMPGTB/PCMPGTD/PCMPGTW xmm, xmm</code></td><td class="grid">2/2/1</td><td class="grid">2/2/1</td><td class="grid">MMX_ALU</td></tr>
</table>
</object>
</div>
</body>
</html>
Fossil version [1205ec86cb] 2025-04-30 16:57:32