11 lines
1013 B
Markdown
11 lines
1013 B
Markdown
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| Opcode | Instruction | Op/En | 64-Bit Mode | Compat/Leg Mode | Description |
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| ------------- | ------------ | ----- | ----------- | --------------- | ----------------------- |
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| FE /1 | DEC _r/m8_ | M | Valid | Valid | Decrement _r/m8_ by 1. |
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| REX + FE /1 | DEC _r/m8_\* | M | Valid | N.E. | Decrement _r/m8_ by 1. |
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| FF /1 | DEC _r/m16_ | M | Valid | Valid | Decrement _r/m16_ by 1. |
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| FF /1 | DEC _r/m32_ | M | Valid | Valid | Decrement _r/m32_ by 1. |
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| REX.W + FF /1 | DEC _r/m64_ | M | Valid | N.E. | Decrement _r/m64_ by 1. |
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| 48+rw | DEC _r16_ | O | N.E. | Valid | Decrement _r16_ by 1. |
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| 48+rd | DEC _r32_ | O | N.E. | Valid | Decrement _r32_ by 1. |
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> * In64-bit mode, r/m8 cannot been coded to access the following byte registers if a REX prefix is used: AH, BH, CH, DH.
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