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MATHS CO-PROCESSOR REFERENCE->FDBSF

FDBSF      Test if Signaling Always False, Decrement and Branch

If Signaling Always False then no operation, else Dn - 1 -> Dn then
if Dn not equal to -1 PC + d -> PC
else execute next instruction

Assembler Syntax: FDBSF Dn,<label>

Attributes: Unsized