FCMGT (scalar, register)
Floating-point compare greater than, setting destination vector element to all ones if the condition holds, else zero.
Is a width specifier, and can be either
Is the number of the SIMD and FP destination register, in the "Rd" field.
Is the number of the first SIMD and FP source register.
Is the number of the second SIMD and FP source register.