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MATHS CO-PROCESSOR REFERENCE->FDBNGLE

FDBNGLE    Test if Not Greater than or Not Less than or Not Equal, Decrement and Branch

If Not Greater than or Not Less than or Not Equal
then no operation, else Dn - 1 -> Dn then
if Dn not equal to -1 PC + d -> PC
else execute next instruction

Assembler Syntax: FDBNGLE Dn,<label>

Attributes: Unsized