Intel 80C188XL - Manual (Page 289)

MATH COPROCESSING
11-4
Available data types include temporary real, long real, short real, short integer and word integer.
The 80C187 performs automatic type conversion to temporary real.
Table 11-2. 80C187 Arithmetic Instructions
Addition Division
FADD Add real FDIV Divide real
FADDP Add real and pop FDIVP Divide real and pop
FIADD Integer add FIDIV Integer divide
Subtraction FDIVR Divide real reversed
FSUB Subtract real FDIVRP Divide real reversed and pop
FSUBP Subtract real and pop FIDIVR Integer divide reversed
FISUB Integer subtract Other Operations
FSUBR Subtract real reversed FSQRT Square root
FSUBRP Subtract real reversed and pop FSCALE Scale
FISUBR Integer subtract reversed FPREM Partial remainder
Multiplication FRNDINT Round to integer
FMUL Multiply real FXTRACT Extract exponent and significand
FMULP Multiply real and pop FABS Absolute value
FIMUL Integer multiply FCHS Change sign
FPREMI Partial remainder (IEEE)