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2025-07-08 02:23:29 -03:00
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<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>MOVDDUP
— Replicate Double Precision Floating-Point Values</title></head><body><header><nav><ul><li><a href='index.html'>Index</a></li><li>December 2023</li></ul></nav></header><h1>MOVDDUP
— Replicate Double Precision Floating-Point Values</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>F2 0F 12 /r MOVDDUP xmm1, xmm2/m64</td>
<td>A</td>
<td>V/V</td>
<td>SSE3</td>
<td>Move double precision floating-point value from xmm2/m64 and duplicate into xmm1.</td></tr>
<tr>
<td>VEX.128.F2.0F.WIG 12 /r VMOVDDUP xmm1, xmm2/m64</td>
<td>A</td>
<td>V/V</td>
<td>AVX</td>
<td>Move double precision floating-point value from xmm2/m64 and duplicate into xmm1.</td></tr>
<tr>
<td>VEX.256.F2.0F.WIG 12 /r VMOVDDUP ymm1, ymm2/m256</td>
<td>A</td>
<td>V/V</td>
<td>AVX</td>
<td>Move even index double precision floating-point values from ymm2/mem and duplicate each element into ymm1.</td></tr>
<tr>
<td>EVEX.128.F2.0F.W1 12 /r VMOVDDUP xmm1 {k1}{z}, xmm2/m64</td>
<td>B</td>
<td>V/V</td>
<td>AVX512VL AVX512F</td>
<td>Move double precision floating-point value from xmm2/m64 and duplicate each element into xmm1 subject to writemask k1.</td></tr>
<tr>
<td>EVEX.256.F2.0F.W1 12 /r VMOVDDUP ymm1 {k1}{z}, ymm2/m256</td>
<td>B</td>
<td>V/V</td>
<td>AVX512VL AVX512F</td>
<td>Move even index double precision floating-point values from ymm2/m256 and duplicate each element into ymm1 subject to writemask k1.</td></tr>
<tr>
<td>EVEX.512.F2.0F.W1 12 /r VMOVDDUP zmm1 {k1}{z}, zmm2/m512</td>
<td>B</td>
<td>V/V</td>
<td>AVX512F</td>
<td>Move even index double precision floating-point values from zmm2/m512 and duplicate each element into zmm1 subject to writemask k1.</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>Tuple Type</th>
<th>Operand 1</th>
<th>Operand 2</th>
<th>Operand 3</th>
<th>Operand 4</th></tr>
<tr>
<td>A</td>
<td>N/A</td>
<td>ModRM:reg (w)</td>
<td>ModRM:r/m (r)</td>
<td>N/A</td>
<td>N/A</td></tr>
<tr>
<td>B</td>
<td>MOVDDUP</td>
<td>ModRM:reg (w)</td>
<td>ModRM:r/m (r)</td>
<td>N/A</td>
<td>N/A</td></tr></table>
<h2 id="description">Description<a class="anchor" href="#description">
</a></h2>
<p>For 256-bit or higher versions: Duplicates even-indexed double precision floating-point values from the source operand (the second operand) and into adjacent pair and store to the destination operand (the first operand).</p>
<p>For 128-bit versions: Duplicates the low double precision floating-point value from the source operand (the second operand) and store to the destination operand (the first operand).</p>
<p>128-bit Legacy SSE version: Bits (MAXVL-1:128) of the corresponding destination register are unchanged. The source operand is XMM register or a 64-bit memory location.</p>
<p>VEX.128 and EVEX.128 encoded version: Bits (MAXVL-1:128) of the destination register are zeroed. The source operand is XMM register or a 64-bit memory location. The destination is updated conditionally under the writemask for EVEX version.</p>
<p>VEX.256 and EVEX.256 encoded version: Bits (MAXVL-1:256) of the destination register are zeroed. The source operand is YMM register or a 256-bit memory location. The destination is updated conditionally under the write-mask for EVEX version.</p>
<p>EVEX.512 encoded version: The destination is updated according to the writemask. The source operand is ZMM register or a 512-bit memory location.</p>
<p>Note: VEX.vvvv and EVEX.vvvv are reserved and must be 1111b otherwise instructions will #UD.</p>
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<figcaption><a href='movddup.html#fig-4-2'>Figure 4-2</a>. VMOVDDUP Operation</figcaption></figure>
<h2 id="operation">Operation<a class="anchor" href="#operation">
</a></h2>
<h3 id="vmovddup--evex-encoded-versions-">VMOVDDUP (EVEX Encoded Versions)<a class="anchor" href="#vmovddup--evex-encoded-versions-">
</a></h3>
<pre>(KL, VL) = (2, 128), (4, 256), (8, 512)
TMP_SRC[63:0] := SRC[63:0]
TMP_SRC[127:64] := SRC[63:0]
IF VL &gt;= 256
TMP_SRC[191:128] := SRC[191:128]
TMP_SRC[255:192] := SRC[191:128]
FI;
IF VL &gt;= 512
TMP_SRC[319:256] := SRC[319:256]
TMP_SRC[383:320] := SRC[319:256]
TMP_SRC[477:384] := SRC[477:384]
TMP_SRC[511:484] := SRC[477:384]
FI;
FOR j := 0 TO KL-1
i := j * 64
IF k1[j] OR *no writemask*
THEN DEST[i+63:i] := TMP_SRC[i+63:i]
ELSE
IF *merging-masking*
THEN *DEST[i+63:i] remains unchanged*
ELSE
; zeroing-masking
DEST[i+63:i] := 0
; zeroing-masking
FI
FI;
ENDFOR
DEST[MAXVL-1:VL] := 0
</pre>
<h3 id="vmovddup--vex-256-encoded-version-">VMOVDDUP (VEX.256 Encoded Version)<a class="anchor" href="#vmovddup--vex-256-encoded-version-">
</a></h3>
<pre>DEST[63:0] := SRC[63:0]
DEST[127:64] := SRC[63:0]
DEST[191:128] := SRC[191:128]
DEST[255:192] := SRC[191:128]
DEST[MAXVL-1:256] := 0
</pre>
<h3 id="vmovddup--vex-128-encoded-version-">VMOVDDUP (VEX.128 Encoded Version)<a class="anchor" href="#vmovddup--vex-128-encoded-version-">
</a></h3>
<pre>DEST[63:0] := SRC[63:0]
DEST[127:64] := SRC[63:0]
DEST[MAXVL-1:128] := 0
</pre>
<h3 id="movddup--128-bit-legacy-sse-version-">MOVDDUP (128-bit Legacy SSE Version)<a class="anchor" href="#movddup--128-bit-legacy-sse-version-">
</a></h3>
<pre>DEST[63:0] := SRC[63:0]
DEST[127:64] := SRC[63:0]
DEST[MAXVL-1:128] (Unmodified)
</pre>
<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>VMOVDDUP __m512d _mm512_movedup_pd( __m512d a);
</pre>
<pre>VMOVDDUP __m512d _mm512_mask_movedup_pd(__m512d s, __mmask8 k, __m512d a);
</pre>
<pre>VMOVDDUP __m512d _mm512_maskz_movedup_pd( __mmask8 k, __m512d a);
</pre>
<pre>VMOVDDUP __m256d _mm256_mask_movedup_pd(__m256d s, __mmask8 k, __m256d a);
</pre>
<pre>VMOVDDUP __m256d _mm256_maskz_movedup_pd( __mmask8 k, __m256d a);
</pre>
<pre>VMOVDDUP __m128d _mm_mask_movedup_pd(__m128d s, __mmask8 k, __m128d a);
</pre>
<pre>VMOVDDUP __m128d _mm_maskz_movedup_pd( __mmask8 k, __m128d a);
</pre>
<pre>MOVDDUP __m256d _mm256_movedup_pd (__m256d a);
</pre>
<pre>MOVDDUP __m128d _mm_movedup_pd (__m128d a);
</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>Non-EVEX-encoded instruction, see <span class="not-imported">Table 2-22</span>, “Type 5 Class Exception Conditions.”</p>
<p>EVEX-encoded instruction, see <span class="not-imported">Table 2-52</span>, “Type E5NF Class Exception Conditions.”</p>
<p>Additionally:</p>
<table>
<tr>
<td>#UD</td>
<td>If EVEX.vvvv != 1111B or VEX.vvvv != 1111B.</td></tr></table><footer><p>
This UNOFFICIAL, mechanically-separated, non-verified reference is provided for convenience, but it may be
inc<span style="opacity: 0.2">omp</span>lete or b<sub>r</sub>oke<sub>n</sub> in various obvious or non-obvious
ways. Refer to <a href="https://software.intel.com/en-us/download/intel-64-and-ia-32-architectures-sdm-combined-volumes-1-2a-2b-2c-2d-3a-3b-3c-3d-and-4">Intel® 64 and IA-32 Architectures Software Developer’s Manual</a> for anything serious.
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