Operation: FPn - Source => FPn
Assembler Syntax:
Attributes: Size = (Byte, Word, Long, Single, Double, Extended)
Description:
Converts the source operand to extended precision (if necessary) and
subtracts that number from the number in the destination floating-point data register.
Stores the result in the destination floating-point data register.
FSUB.X (ea),FPn
FSUB.X FPm,FPn