X86-64 Instruction Encoding: Difference between revisions
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The ModR/M byte encodes a register or an opcode extension, and a register or a memory address. It is only required when ''/r'' or ''/0'' through ''/7'' is specified at the opcode syntax. It has the following fields:
<pre>
+---+---+---+---+---+---+---+---+
| mod | reg | rm |
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