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UMULT (Super FX): Difference between revisions
From SnesLab
(CONFIG reg determines # of cycles) |
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=== External Links === | === External Links === | ||
# Official Nintendo documentation on UMULT: 9.90 on [https://archive.org/details/SNESDevManual/book2/page/n278 page 2-9-122 of Book II] | # Official Nintendo documentation on UMULT: 9.90 on [https://archive.org/details/SNESDevManual/book2/page/n278 page 2-9-122 of Book II] | ||
# [https://archive.org/details/SNESDevManual/book2/page/n155 page 2-8-16 of Book II], lbid. | # 8.2 "Multiplication Instructions" on [https://archive.org/details/SNESDevManual/book2/page/n155 page 2-8-16 of Book II], lbid. | ||
[[Category:ASM]] | [[Category:ASM]] | ||
Revision as of 16:14, 2 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Opcode | Length | ROM Speed | RAM Speed | Cache Speed | |||
| 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 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.