PWB1/usr/man/man3/fptrap.3

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.th FPTRAP III 5/31/77
.sh NAME
fptrap \*- floating point interpreter
.sh SYNOPSIS
.ft B
sys	signal; 4; fptrap
.ft R
.sh DESCRIPTION
.it 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.
.sh 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.
.sh DIAGNOSTICS
A break point trap is given when a real
illegal instruction trap occurs.
.sh "SEE ALSO"
signal(II),
the `\*-f' option of cc(I)
.sh BUGS
Rounding mode is not interpreted.
It's slow.