Scientific Operations



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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