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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:svg="http://www.w3.org/2000/svg" xmlns:x86="http://www.felixcloutier.com/x86"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><link rel="stylesheet" type="text/css" href="style.css"></link><title>PEXT
— Parallel Bits Extract</title></head><body><header><nav><ul><li><a href='index.html'>Index</a></li><li>December 2023</li></ul></nav></header><h1>PEXT
— Parallel Bits Extract</h1>
<table>
<tr>
<th>Opcode/Instruction</th>
<th>Op/En</th>
<th>64/32-bit Mode</th>
<th>CPUID Feature Flag</th>
<th>Description</th></tr>
<tr>
<td>VEX.LZ.F3.0F38.W0 F5 /r PEXT r32a, r32b, r/m32</td>
<td>RVM</td>
<td>V/V</td>
<td>BMI2</td>
<td>Parallel extract of bits from r32b using mask in r/m32, result is written to r32a.</td></tr>
<tr>
<td>VEX.LZ.F3.0F38.W1 F5 /r PEXT r64a, r64b, r/m64</td>
<td>RVM</td>
<td>V/N.E.</td>
<td>BMI2</td>
<td>Parallel extract of bits from r64b using mask in r/m64, result is written to r64a.</td></tr></table>
<h2 id="instruction-operand-encoding">Instruction Operand Encoding<a class="anchor" href="#instruction-operand-encoding">
</a></h2>
<table>
<tr>
<th>Op/En</th>
<th>Operand 1</th>
<th>Operand 2</th>
<th>Operand 3</th>
<th>Operand 4</th></tr>
<tr>
<td>RVM</td>
<td>ModRM:reg (w)</td>
<td>VEX.vvvv (r)</td>
<td>ModRM:r/m (r)</td>
<td>N/A</td></tr></table>
<h2 id="description">Description<a class="anchor" href="#description">
</a></h2>
<p>PEXT uses a mask in the second source operand (the third operand) to transfer either contiguous or non-contiguous bits in the first source operand (the second operand) to contiguous low order bit positions in the destination (the first operand). For each bit set in the MASK, PEXT extracts the corresponding bits from the first source operand and writes them into contiguous lower bits of destination operand. The remaining upper bits of destination are zeroed.</p>
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<text lengthAdjust="spacingAndGlyphs" style="font-size: 16.97010000000006pt; fill: #000" textLength="123.44112" x="125.76" y="15.064799999999991">SRC1 S31S30 S29S28S27</text>
<text lengthAdjust="spacingAndGlyphs" style="font-size: 12.829800000000034pt; fill: #000" textLength="147.91920000000005" x="316.02" y="15.064799999999991">S7 S6 S5 S4 S3 S2 S1 S0</text>
<text lengthAdjust="spacingAndGlyphs" style="font-size: 15.54630000000003pt; fill: #000" textLength="121.94460000000002" x="123.89970000000001" y="58.64099999999996">SRC2 0 0 0 1 0</text>
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<text lengthAdjust="spacingAndGlyphs" style="font-size: 10.925999999999988pt; fill: #000" textLength="32.36400000000002" x="123.89970000000001" y="64.9403999999999">(mask)</text>
<text lengthAdjust="spacingAndGlyphs" style="font-size: 14.74980000000005pt; fill: #000" textLength="140.71859999999998" x="324.54060000000004" y="117.4848">0 0 0 0 S28 S7 S5 S2</text>
<text lengthAdjust="spacingAndGlyphs" style="font-size: 11.285999999999945pt; fill: #000" textLength="123.20490000000002" x="125.76" y="115.28099999999995">DEST 0 0 0 0 0</text>
<text lengthAdjust="spacingAndGlyphs" style="font-size: 10.925999999999988pt; fill: #000" textLength="20.489399999999932" x="449.70000000000005" y="137.96099999999996">bit 0</text>
<text lengthAdjust="spacingAndGlyphs" style="font-size: 10.925999999999988pt; fill: #000" textLength="26.189999999999998" x="152.16000000000003" y="140.48099999999994">bit 31</text></g></svg>
<figcaption><a href='pext.html#fig-4-9'>Figure 4-9</a>. PEXT Example</figcaption></figure>
<p>This instruction is not supported in real mode and virtual-8086 mode. The operand size is always 32 bits if not in 64-bit mode. In 64-bit mode operand size 64 requires VEX.W1. VEX.W1 is ignored in non-64-bit modes. An attempt to execute this instruction with VEX.L not equal to 0 will cause #UD.</p>
<h2 id="operation">Operation<a class="anchor" href="#operation">
</a></h2>
<pre>TEMP := SRC1;
MASK := SRC2;
DEST := 0 ;
m := 0, k := 0;
DO WHILE m &lt; OperandSize
IF MASK[ m] = 1 THEN
DEST[ k] := TEMP[ m];
k := k+ 1;
FI
m := m+ 1;
OD
</pre>
<h2 id="flags-affected">Flags Affected<a class="anchor" href="#flags-affected">
</a></h2>
<p>None.</p>
<h2 id="intel-c-c++-compiler-intrinsic-equivalent">Intel C/C++ Compiler Intrinsic Equivalent<a class="anchor" href="#intel-c-c++-compiler-intrinsic-equivalent">
</a></h2>
<pre>PEXT unsigned __int32 _pext_u32(unsigned __int32 src, unsigned __int32 mask);
</pre>
<pre>PEXT unsigned __int64 _pext_u64(unsigned __int64 src, unsigned __int32 mask);
</pre>
<h2 class="exceptions" id="simd-floating-point-exceptions">SIMD Floating-Point Exceptions<a class="anchor" href="#simd-floating-point-exceptions">
</a></h2>
<p>None.</p>
<h2 class="exceptions" id="other-exceptions">Other Exceptions<a class="anchor" href="#other-exceptions">
</a></h2>
<p>See <span class="not-imported">Table 2-29</span>, “Type 13 Class Exception Conditions.”</p><footer><p>
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