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<title>UNPCKHPD: Unpack and Interleave High Packed Double- Precision Floating-Point Values (x86 Instruction Set Reference)</title>
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<div class="main_container"><h1>x86 Instruction Set Reference</h1>
<title>UNPCKHPD: Unpack and Interleave High Packed Double- Precision Floating-Point Values (x86 Instruction Set Reference)</title>
<h1>UNPCKHPD</h1>
<h2>Unpack and Interleave High Packed Double- Precision Floating-Point Values</h2>
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<th>Opcode</th>
<th>Mnemonic</th>
<th>Description</th>
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<td class="grid"><code>66 0F 15 /r</code></td>
<td class="grid"><code>UNPCKHPD xmm1, xmm2/m128</code></td>
<td class="grid">Unpack and interleave double-precision floating-point values from the high quadwords of xmm1 and xmm2/m128.</td>
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<th>Description</th>
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<p>Performs an interleaved unpack of the high double-precision floating-point values from the source operand (second operand) and the destination operand (first operand).</p>
<p>The source operand can be an XMM register or a 128-bit memory location; the destination operand is an XMM register.</p>
<p>When unpacking from a memory operand, an implementation may fetch only the appropriate 64 bits; however, alignment to 16-byte boundary and normal segment checking will still be enforced.</p>
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<pre>Destination<span class="operator">[</span><span class="number">0..63</span><span class="operator">]</span> <span class="operator">=</span> Destination<span class="operator">[</span><span class="number">64..127</span><span class="operator">]</span><span class="operator">;</span>
Destination<span class="operator">[</span><span class="number">64..127</span><span class="operator">]</span> <span class="operator">=</span> Source<span class="operator">[</span><span class="number">64..127</span><span class="operator">]</span><span class="operator">;</span>
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<th>Instruction</th>
<th>Latency</th>
<th>Throughput</th>
<th>Execution Unit</th>
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<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>UNPCKHPD xmm, xmm</code></td><td class="grid">6/6/1</td><td class="grid">2/2/1</td><td class="grid">MMX_SHFT</td></tr>
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