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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>OR
— Logical Inclusive OR</title></head><body><header><nav><ul><li><a href='index.html'>Index</a></li><li>December 2023</li></ul></nav></header><h1>OR
— Logical Inclusive OR</h1>
<table>
<tr>
<th>Opcode</th>
<th>Instruction</th>
<th>Op/En</th>
<th>64-Bit Mode</th>
<th>Compat/Leg Mode</th>
<th>Description</th></tr>
<tr>
<td>0C ib</td>
<td>OR AL, imm8</td>
<td>I</td>
<td>Valid</td>
<td>Valid</td>
<td>AL OR imm8.</td></tr>
<tr>
<td>0D iw</td>
<td>OR AX, imm16</td>
<td>I</td>
<td>Valid</td>
<td>Valid</td>
<td>AX OR imm16.</td></tr>
<tr>
<td>0D id</td>
<td>OR EAX, imm32</td>
<td>I</td>
<td>Valid</td>
<td>Valid</td>
<td>EAX OR imm32.</td></tr>
<tr>
<td>REX.W + 0D id</td>
<td>OR RAX, imm32</td>
<td>I</td>
<td>Valid</td>
<td>N.E.</td>
<td>RAX OR imm32 (sign-extended).</td></tr>
<tr>
<td>80 /1 ib</td>
<td>OR r/m8, imm8</td>
<td>MI</td>
<td>Valid</td>
<td>Valid</td>
<td>r/m8 OR imm8.</td></tr>
<tr>
<td>REX + 80 /1 ib</td>
<td>OR r/m8<sup>1</sup>, imm8</td>
<td>MI</td>
<td>Valid</td>
<td>N.E.</td>
<td>r/m8 OR imm8.</td></tr>
<tr>
<td>81 /1 iw</td>
<td>OR r/m16, imm16</td>
<td>MI</td>
<td>Valid</td>
<td>Valid</td>
<td>r/m16 OR imm16.</td></tr>
<tr>
<td>81 /1 id</td>
<td>OR r/m32, imm32</td>
<td>MI</td>
<td>Valid</td>
<td>Valid</td>
<td>r/m32 OR imm32.</td></tr>
<tr>
<td>REX.W + 81 /1 id</td>
<td>OR r/m64, imm32</td>
<td>MI</td>
<td>Valid</td>
<td>N.E.</td>
<td>r/m64 OR imm32 (sign-extended).</td></tr>
<tr>
<td>83 /1 ib</td>
<td>OR r/m16, imm8</td>
<td>MI</td>
<td>Valid</td>
<td>Valid</td>
<td>r/m16 OR imm8 (sign-extended).</td></tr>
<tr>
<td>83 /1 ib</td>
<td>OR r/m32, imm8</td>
<td>MI</td>
<td>Valid</td>
<td>Valid</td>
<td>r/m32 OR imm8 (sign-extended).</td></tr>
<tr>
<td>REX.W + 83 /1 ib</td>
<td>OR r/m64, imm8</td>
<td>MI</td>
<td>Valid</td>
<td>N.E.</td>
<td>r/m64 OR imm8 (sign-extended).</td></tr>
<tr>
<td>08 /r</td>
<td>OR r/m8, r8</td>
<td>MR</td>
<td>Valid</td>
<td>Valid</td>
<td>r/m8 OR r8.</td></tr>
<tr>
<td>REX + 08 /r</td>
<td>OR r/m8<sup>1</sup>, r8<sup>1</sup></td>
<td>MR</td>
<td>Valid</td>
<td>N.E.</td>
<td>r/m8 OR r8.</td></tr>
<tr>
<td>09 /r</td>
<td>OR r/m16, r16</td>
<td>MR</td>
<td>Valid</td>
<td>Valid</td>
<td>r/m16 OR r16.</td></tr>
<tr>
<td>09 /r</td>
<td>OR r/m32, r32</td>
<td>MR</td>
<td>Valid</td>
<td>Valid</td>
<td>r/m32 OR r32.</td></tr>
<tr>
<td>REX.W + 09 /r</td>
<td>OR r/m64, r64</td>
<td>MR</td>
<td>Valid</td>
<td>N.E.</td>
<td>r/m64 OR r64.</td></tr>
<tr>
<td>0A /r</td>
<td>OR r8, r/m8</td>
<td>RM</td>
<td>Valid</td>
<td>Valid</td>
<td>r8 OR r/m8.</td></tr>
<tr>
<td>REX + 0A /r</td>
<td>OR r8<sup>1</sup>, r/m8<sup>1</sup></td>
<td>RM</td>
<td>Valid</td>
<td>N.E.</td>
<td>r8 OR r/m8.</td></tr>
<tr>
<td>0B /r</td>
<td>OR r16, r/m16</td>
<td>RM</td>
<td>Valid</td>
<td>Valid</td>
<td>r16 OR r/m16.</td></tr>
<tr>
<td>0B /r</td>
<td>OR r32, r/m32</td>
<td>RM</td>
<td>Valid</td>
<td>Valid</td>
<td>r32 OR r/m32.</td></tr>
<tr>
<td>REX.W + 0B /r</td>
<td>OR r64, r/m64</td>
<td>RM</td>
<td>Valid</td>
<td>N.E.</td>
<td>r64 OR r/m64.</td></tr></table>
<blockquote>
<p>1. In 64-bit mode, r/m8 can not be encoded to access the following byte registers if a REX prefix is used: AH, BH, CH, DH.</p></blockquote>
<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>I</td>
<td>AL/AX/EAX/RAX</td>
<td>imm8/16/32</td>
<td>N/A</td>
<td>N/A</td></tr>
<tr>
<td>MI</td>
<td>ModRM:r/m (r, w)</td>
<td>imm8/16/32</td>
<td>N/A</td>
<td>N/A</td></tr>
<tr>
<td>MR</td>
<td>ModRM:r/m (r, w)</td>
<td>ModRM:reg (r)</td>
<td>N/A</td>
<td>N/A</td></tr>
<tr>
<td>RM</td>
<td>ModRM:reg (r, 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>Performs a bitwise inclusive OR operation between the destination (first) and source (second) operands and stores the result in the destination operand location. The source operand can be an immediate, a register, or a memory location; the destination operand can be a register or a memory location. (However, two memory operands cannot be used in one instruction.) Each bit of the result of the OR instruction is set to 0 if both corresponding bits of the first and second operands are 0; otherwise, each bit is set to 1.</p>
<p>This instruction can be used with a LOCK prefix to allow the instruction to be executed atomically.</p>
<p>In 64-bit mode, the instruction’s default operation size is 32 bits. Using a REX prefix in the form of REX.R permits access to additional registers (R8-R15). Using a REX prefix in the form of REX.W promotes operation to 64 bits. See the summary chart at the beginning of this section for encoding data and limits.</p>
<h2 id="operation">Operation<a class="anchor" href="#operation">
</a></h2>
<pre>DEST := DEST OR SRC;
</pre>
<h2 id="flags-affected">Flags Affected<a class="anchor" href="#flags-affected">
</a></h2>
<p>The OF and CF flags are cleared; the SF, ZF, and PF flags are set according to the result. The state of the AF flag is undefined.</p>
<h2 class="exceptions" id="protected-mode-exceptions">Protected Mode Exceptions<a class="anchor" href="#protected-mode-exceptions">
</a></h2>
<table>
<tr>
<td rowspan="3">#GP(0)</td>
<td>If the destination operand points to a non-writable segment.</td></tr>
<tr>
<td>If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit.</td></tr>
<tr>
<td>If the DS, ES, FS, or GS register contains a NULL segment selector.</td></tr>
<tr>
<td>#SS(0)</td>
<td>If a memory operand effective address is outside the SS segment limit.</td></tr>
<tr>
<td>#PF(fault-code)</td>
<td>If a page fault occurs.</td></tr>
<tr>
<td>#AC(0)</td>
<td>If alignment checking is enabled and an unaligned memory reference is made while the current privilege level is 3.</td></tr>
<tr>
<td>#UD</td>
<td>If the LOCK prefix is used but the destination is not a memory operand.</td></tr></table>
<h2 class="exceptions" id="real-address-mode-exceptions">Real-Address Mode Exceptions<a class="anchor" href="#real-address-mode-exceptions">
</a></h2>
<table>
<tr>
<td>#GP</td>
<td>If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit.</td></tr>
<tr>
<td>#SS</td>
<td>If a memory operand effective address is outside the SS segment limit.</td></tr>
<tr>
<td>#UD</td>
<td>If the LOCK prefix is used but the destination is not a memory operand.</td></tr></table>
<h2 class="exceptions" id="virtual-8086-mode-exceptions">Virtual-8086 Mode Exceptions<a class="anchor" href="#virtual-8086-mode-exceptions">
</a></h2>
<table>
<tr>
<td>#GP(0)</td>
<td>If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit.</td></tr>
<tr>
<td>#SS(0)</td>
<td>If a memory operand effective address is outside the SS segment limit.</td></tr>
<tr>
<td>#PF(fault-code)</td>
<td>If a page fault occurs.</td></tr>
<tr>
<td>#AC(0)</td>
<td>If alignment checking is enabled and an unaligned memory reference is made.</td></tr>
<tr>
<td>#UD</td>
<td>If the LOCK prefix is used but the destination is not a memory operand.</td></tr></table>
<h2 class="exceptions" id="compatibility-mode-exceptions">Compatibility Mode Exceptions<a class="anchor" href="#compatibility-mode-exceptions">
</a></h2>
<p>Same as for protected mode exceptions.</p>
<h2 class="exceptions" id="64-bit-mode-exceptions">64-Bit Mode Exceptions<a class="anchor" href="#64-bit-mode-exceptions">
</a></h2>
<table>
<tr>
<td>#SS(0)</td>
<td>If a memory address referencing the SS segment is in a non-canonical form.</td></tr>
<tr>
<td>#GP(0)</td>
<td>If the memory address is in a non-canonical form.</td></tr>
<tr>
<td>#PF(fault-code)</td>
<td>If a page fault occurs.</td></tr>
<tr>
<td>#AC(0)</td>
<td>If alignment checking is enabled and an unaligned memory reference is made while the current privilege level is 3.</td></tr>
<tr>
<td>#UD</td>
<td>If the LOCK prefix is used but the destination is not a memory operand.</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.
</p></footer></body></html>
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