i>May 2018</li></ul></nav></header><h1>VRSQRT28PD
		— Approximation to the Reciprocal Square Root of Packed Double-Precision Floating-Point Values with Less Than 2^-28 Relative Error</h1>

<table>
<tr>
<th>Opcode/Instruction</th>
<th>Op/En</th>
<th>64/32 bit Mode Support</th>
<th>CPUID Feature Flag</th>
<th>Description</th></tr>
<tr>
<td>EVEX.512.66.0F38.W1 CC /r VRSQRT28PD zmm1 {k1}{z}, zmm2/m512/m64bcst {sae}</td>
<td>A</td>
<td>V/V</td>
<td>AVX512ER</td>
<td>Computes approximations to the Reciprocal sq