FPTRAP(III) 11/18/73 FPTRAP(III)





FPTRAP(III)                 11/18/73                  FPTRAP(III)







NAME

     fptrap - floating point interpreter



SYNOPSIS

     sys     signal; 4; fptrap



DESCRIPTION

     Fptrap is a simulator of the  11/45  FP11-B  floating  point

     unit.   It  works  by intercepting illegal instruction traps

     and decoding and  executing  the  floating  point  operation

     codes.



FILES

     In systems with real floating point, there is a fake routine

     in  /lib/liba.a  with this name; when simulation is desired,

     the real version should be put in liba.a



DIAGNOSTICS

     A break point trap is given when a real illegal  instruction

     trap occurs.



SEE ALSO

     signal (II), cc (I) (`-f' option)



BUGS

     Rounding mode is not interpreted.  It's slow.
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