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Source Register
From SnesLab
(Redirected from Sreg)
The Source Register (Sreg) exists on the Super FX. It is assigned with FROM or WITH. It supplies the input for many instructions, including:
- ADC Rn
- ADC #n
- ADD Rn
- ADD #n
- AND Rn
- AND #n
- ASR
- BIC Rn
- BIC #n
- CMODE
- CMP Rn
- COLOR
- DIV2
- FMULT
- GETBH
- GETBL
- HIB
- LJMP
- LMULT
- LOB
- LSR
- MULT Rn
- MULT #n
- NOT
- OR Rn
- OR #n
- RAMB
- ROL
- ROMB
- ROR
- SBC Rn
- SBK
- SEX
- STB
- STW
- SUB Rn
- SUB #n
- SWAP
- UMULT
Any register from R0 to R15 can serve as Sreg. R0 is the default.
Some instructions ignore the source register. No instructions modify its value.