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SUB (Super FX): Difference between revisions

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'''SUB''' is a [[Super FX]] instruction that performs a subtraction between the [[source register]] and an operand.  The difference is stored in the [[destination register]].  The subtrahend may be any register from R<sub>0</sub> to R<sub>15</sub> or any immediate value from 0 to 15.  The source register is the minuend.
'''SUB''' is a [[Super FX]] instruction that performs a subtraction between the [[source register]] and an operand.  The difference is stored in the [[destination register]].  The subtrahend may be any register from R<sub>0</sub> to R<sub>15</sub> or any immediate value from 0 to 15.  The source register is the minuend.
The [[ALT0]] state is restored.


The source and destination registers should be specified in advance using [[WITH]], [[FROM]], or [[TO]].  Otherwise, R<sub>0</sub> serves as the default.
The source and destination registers should be specified in advance using [[WITH]], [[FROM]], or [[TO]].  Otherwise, R<sub>0</sub> serves as the default.

Revision as of 00:27, 13 July 2024

Basic Info
Addressing Mode Opcode Length ROM Speed RAM Speed Cache Speed
Implied (type 1) 6n 1 byte 3 cycles 3 cycles 1 cycle
Immediate 3E6n 2 bytes 6 cycles 6 cycles 2 cycle
Flags Affected
B ALT1 ALT2 O/V S CY Z
0 0 0

SUB is a Super FX instruction that performs a subtraction between the source register and an operand. The difference is stored in the destination register. The subtrahend may be any register from R0 to R15 or any immediate value from 0 to 15. The source register is the minuend.

The ALT0 state is restored.

The source and destination registers should be specified in advance using WITH, FROM, or TO. Otherwise, R0 serves as the default.

Syntax

SUB Rn
SUB #n

Example 1

Let:

Sreg : R5
Dreg : R4
R5 = 735ah
R8 = 426bh

After executing SUB R8:

R4 = 30efh

Example 2

Let:

Sreg : R0
Dreg : R0
R0 = 329bh

After executing SUB #10:

R0 = 3291h

See Also

External Links