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UMULT (Super FX): Difference between revisions
From SnesLab
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'''UMULT''' is an unsigned multiplication [[Super FX]] instruction. The product is stored in the [[destination register]]. | '''UMULT''' is an unsigned multiplication [[Super FX]] instruction. The factors are the low byte of the [[source register]] and the low byte of the register specified in the operand. The product is stored in the [[destination register]]. | ||
UMULT utilizes the 8-bit multiplier only once, so it is fast.<sup>[2]</sup> | UMULT utilizes the 8-bit multiplier only once, so it is fast.<sup>[2]</sup> | ||
Revision as of 19:20, 2 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| Implied (type 1) | 3D8n | 2 bytes | 6 or 8 cycles | 6 or 8 cycles | 2 or 3 cycles | ||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| 0 | 0 | 0 | . | . | ||||
UMULT is an unsigned multiplication Super FX instruction. The factors are the low byte of the source register and the low byte of the register specified in the operand. The product is stored in the destination register.
UMULT utilizes the 8-bit multiplier only once, so it is fast.[2]
The exact number of cycles depends on the state of the CONFIG register.
See Also
External Links
- Official Nintendo documentation on UMULT: 9.90 on page 2-9-122 of Book II
- 8.2 "Multiplication Instructions" on page 2-8-16 of Book II, lbid.