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MERGE (Super FX): Difference between revisions
From SnesLab
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==== Example ==== | |||
Let: | |||
D<sub>reg</sub> : R<sub>9</sub> | |||
R<sub>7</sub> = 05aah | |||
R<sub>8</sub> = fc33h | |||
After executing MERGE: | |||
R<sub>9</sub> = 05fch | |||
and the sign, overflow, carry, and zero flags are set | |||
[[File:gsu_merge.png]] | [[File:gsu_merge.png]] | ||
Revision as of 19:39, 8 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| Implied (type 1) | 70 | 1 byte | 3 cycles | 3 cycles | 1 cycle | ||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| 0 | 0 | 0 | ||||||
MERGE is a Super FX instruction that merges the high byte of two registers into the destination register.
The high byte of Dreg comes from R7. The low byte of Dreg comes from R8.
The official documentation has several bits labeled "B" not 'D" below the "Flags affected" table.[1]
Syntax
MERGE
Example
Let:
Dreg : R9 R7 = 05aah R8 = fc33h
After executing MERGE:
R9 = 05fch
and the sign, overflow, carry, and zero flags are set
See Also
External Links
- Official Nintendo documentation on MERGE: paragraph 9.56 on page 2-9-79 of Book II
- example: page 2-9-80 of Book II, lbid.