FRNDINT         Round to integer                     Exceptions: I P
                                                     C3 C2 C1 C0: ? ? * ?
FRNDINT

        Logic   ST ← round(ST)

    FRNDINT rounds the value in ST to an integer according to the RC
    (rounding control) field of the FPU control word.


    Opcode      Format
    D9 FC       FRNDINT


    Timing
    Operand       8087         287        387      486     Pentium
    -            16-50        16-50      66-80    21-30    9-20    NP