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MATHS CO-PROCESSOR REFERENCE->FDBUGLE

FDBUGLE    Test if Unordered, Decrement and Branch

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

Assembler Syntax: FDBUGLE Dn,<label>

Attributes: Unsized