9 lines
960 B
Markdown
9 lines
960 B
Markdown
| Opcode | Instruction | Op/En | 64-Bit Mode | Compat/Leg Mode | Description |
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| ------------- | ----------- | ----- | ----------- | --------------- | ------------------------------------------- |
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| F6 /4 | MUL r/m8 | M | Valid | Valid | Unsigned multiply (AX := AL ∗ r/m8). |
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| REX + F6 /4 | MUL r/m8\* | M | Valid | N.E. | Unsigned multiply (AX := AL ∗ r/m8). |
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| F7 /4 | MUL r/m16 | M | Valid | Valid | Unsigned multiply (DX:AX := AX ∗ r/m16). |
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| F7 /4 | MUL r/m32 | M | Valid | Valid | Unsigned multiply (EDX:EAX := EAX ∗ r/m32). |
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| REX.W + F7 /4 | MUL r/m64 | M | Valid | N.E. | Unsigned multiply (RDX:RAX := RAX ∗ r/m64). |
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> \*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. |