.\" $Header$
.TH EM_OPT 6 "$Revision$"
.ad
.SH NAME
em_opt \- EM peephole optimizer
.SH SYNOPSIS
.B ~em/lib.bin/em_opt
[-Ln] [-m[l]<num>] [ argument ]
.SH DESCRIPTION
Em_opt reads a compact EM-program, argument or standard input,
and produces another compact EM program on standard output
that is functionally equivalent,
but smaller.
Some other functions are here that make this program mandatory
before running a codegenerator,
it may be left out when interpretation is wanted.
Flags recognized are:
.IP -L
Make a library module.
This means that the output will start with a message giving
the names of all exported entities in this module.
.IP -n
Do not optimize.
No peephole optimizations will be performed,
other functions will be carried out.
.IP -m<num>
Try to replace multiplies with constants by combinations of shifts and adds,
but no more than <num> of them. Integer overflow detection is lost with this
option.
.IP -ml<num>
Like -m<num>, but also for long multiplies.
.SH "FILES"
/usr/tmp/emopt??????, is used when the -L flag is given only.
.SH "SEE ALSO"
ack(1)
.PD 0
.IP [1]
A.S. Tanenbaum, Hans van Staveren, Ed Keizer and Johan
Stevenson "Description of a machine architecture for use with
block structured languages" Informatica report IR-81.
.SH AUTHOR
Hans van Staveren, Vrije Universiteit