Floating-point subtraction (single precision) (Floating-point Subtract (Single))
This instruction subtracts the single-precision floating-point format contents of general-purpose register reg1 from the single-precision floating-point format contents of general-purpose register reg2, and stores the result in general-purpose register reg3. The operation is executed as if it were of infinite accuracy, and the result is rounded in accordance with the current rounding mode.