enhancementgood first issuehelp wantedisa-extension
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描述
To simplify 16-bit arithmetic, it would be useful to introduce ADC/SBC pseudo-opcodes that add or subtract the carry flag from the previous operation.
Currently 16-bit addition requires explicit carry handling
; R0:R1 x (hi:lo)
; R2:R3 y (hi:lo)
ADD R1 R3
JNCR [.no_carry]
INC R0
.no_carry:
ADD R0 R2
With an ADC pseudo opcode the same operation becomes shorter and clearer
ADD R1 R3
ADC R0
ADD R0 R2