</p>
<p>Note: If VORPD is encoded with VEX.L= 1, an attempt to execute the instruction encoded with VEX.L= 1 will cause an #UD exception.</p>
<h2>Operation</h2>
<p><strong>ORPD (128-bit Legacy SSE version)</strong></p>
<pre>DEST[63:0] ← DEST[63:0] BITWISE OR SRC[63:0]
DEST[127:64] ← DEST[127:64] BITWISE OR SRC[127:64]
DEST[VLMAX-1:128] (Unmodified)</pre>
<p><strong>VORPD (VEX.128 encoded version)</strong></p>
<pre>DEST[63:0] ← SRC1[63:0] BITWISE OR SRC2[63:0]
DEST[127:64] ← SRC1[127:64] BITWISE OR S