Appendix B. THE 80×86 INSTRUCTION SET
The following three tables discuss the integer/control, floating point, and MMX instruction sets. This document uses the following abbreviations:
| imm | A constant value; must be appropriate for the operand size. |
| imm8 | An 8-bit immediate constant. Some instructions limit the range of this value to less than 0..255. |
| immL | A 16- or 32-bit immediate constant. |
| immH | A 16- or 32-bit immediate constant. |
| reg | A general purpose integer register. |
| reg8 | A general purpose 8-bit register. |
| reg16 | A general purpose 16-bit register. |
| reg32 | A general purpose 32-bit register. |
| mem | An arbitrary memory location using any of the available addressing modes. |
| mem16 | A word variable using any legal addressing mode. |
| mem32 ... |
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