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ADX
ADX (Add EX) is one of the opcodes in the DCPU-16 specification. It represents an addition of two numbers and the EX register.
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[edit] Usage
ADX arg1, arg2
ADX takes the sum of arg1, arg2 and EX and stores it in arg1.
[edit] Overflow handling
As a mathematical operation it needs to handle the possibility of overflow, in this case when the sum of arg1, arg2 and EX is larger than what can be represented in arg1.
When the sum is too big, the overflow register EX will be set to 0x0001. (There has been no word yet of whether an overflow of 0x0002 is possible.)
When the sum is manageable, EX will be set to 0x0000
[edit] Signing dependence
ADX handles both signed and unsigned numbers correctly. However, when operating on signed numbers, the overflow register EX no longer indicates that carrying has occurred.
[edit] Processing
In binary machine code, this Basic opcode's five-bit representation is: 0b1 1010 (0x1a)
The instruction has a takes three cycles to execute, plus any additional cycles necessary to evaluate the arguments.
[edit] References
- DCPU-16 specification v1.7 (Copyright 2012 Mojang)
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