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CMP (Super FX): Difference between revisions
From SnesLab
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==== Example ==== | |||
Let: | |||
S<sub>reg</sub> : R<sub>1</sub> | |||
R<sub>1</sub> = 8000h | |||
R<sub>3</sub> = 2fffh | |||
After executing CMP R<sub>3</sub>, the overflow and carry flags are set but the sign and zero flags are clear. | |||
=== See Also === | === See Also === | ||
Revision as of 19:21, 8 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| Implied (type 1) | 3F6n | 2 bytes | 6 cycles | 6 cycles | 2 cycles | ||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| 0 | 0 | 0 | ||||||
CMP (Compare) is a Super FX instruction that compares the operand register with the source register. Internally, this is done via a subtraction, but the difference is not stored anywhere. Thus, the purpose of CMP is to setup the flags.
The operand serves as the subtrahend and can be any register from R0 to R15.
Syntax
CMP Rn
Example
Let:
Sreg : R1 R1 = 8000h R3 = 2fffh
After executing CMP R3, the overflow and carry flags are set but the sign and zero flags are clear.
See Also
External Links
- Official Nintendo documentation on CMP: 9.29 on page 2-9-41 of Book II