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MULT (Super FX): Difference between revisions
From SnesLab
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After executing MULT R<sub>1</sub>: | After executing MULT R<sub>1</sub>: | ||
R<sub>2</sub> = 0961h | R<sub>2</sub> = 0961h | ||
==== Example 2 ==== | |||
Let: | |||
S<sub>reg</sub> : R<sub>3</sub> | |||
D<sub>reg</sub> : R<sub>4</sub> | |||
R<sub>3</sub> = 95c6h | |||
After executing MULT #9: | |||
R<sub>4</sub> = fdf6h | |||
=== See Also === | === See Also === | ||
Revision as of 00:01, 9 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| Implied (type 1) | 8n | 1 byte | 3 or 5 cycles | 3 or 5 cycles | 1 or 2 cycles | ||
| Immediate | 3E8n | 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 | . | . | ||||
MULT is a Super FX instruction that performs a signed multiplication. One of the factors is the low byte of the source register. The other factor may be any register from R0 to R15 or an immediate int from 0 to 15. The product is stored in the destination register.
MULT utilizes the 8-bit multiplier only once, so it is fast.[2]
The exact number of cycles depends on the state of the CFGR register.
Syntax
MULT Rn MULT #n
Example 1
Let:
Sreg : R5 Dreg : R2 R5 = 52cfh R1 = 63cfh
After executing MULT R1:
R2 = 0961h
Example 2
Let:
Sreg : R3 Dreg : R4 R3 = 95c6h
After executing MULT #9:
R4 = fdf6h
See Also
External Links
- Official Nintendo documentation on MULT: 9.66 on Page 2-9-93 of Book II
- 8.2 "Multiplication Instructions" on page 2-8-16 of Book II, lbid.