Clock cycles for integer multiplication and division
mul and imul (one-operand form)
The actual number of clock cycles depends on numbers being multiplied.| Destin. | 386 | 486 | Pentium |
|---|---|---|---|
| reg8 | 9-14 | 13-18 | 11 |
| reg16 | 9-22 | 13-26 | 11 |
| reg32 | 9-38 | 13-42 | 10 |
| mem8 | 12-17 | 13-18 | 11 |
| mem16 | 12-25 | 13-26 | 11 |
| mem32 | 12-41 | 13-42 | 11 |
div
| Destin. | 386 | 486 | Pentium |
|---|---|---|---|
| reg8 | 14 | 16 | 17 |
| reg16 | 22 | 24 | 25 |
| reg32 | 38 | 40 | 41 |
| mem8 | 17 | 16 | 17 |
| mem16 | 25 | 24 | 25 |
| mem32 | 41 | 40 | 41 |
idiv
| Destin. | 386 | 486 | Pentium |
|---|---|---|---|
| reg8 | 19 | 19 | 22 |
| reg16 | 27 | 27 | 30 |
| reg32 | 43 | 43 | 48 |
| mem8 | 22 | 20 | 22 |
| mem16 | 30 | 28 | 30 |
| mem32 | 46 | 44 | 48 |