1984-07-12 15:18:13 +00:00
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.\" $Header$
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1991-10-01 12:18:39 +00:00
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.TH EM_OPT 6 "$Revision$"
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1984-07-12 14:14:54 +00:00
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.ad
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.SH NAME
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em_opt \- EM peephole optimizer
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.SH SYNOPSIS
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1991-11-20 16:45:25 +00:00
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.B ~em/lib.bin/em_opt
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[-Ln] [-m[l]<num>] [ argument ]
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1984-07-12 14:14:54 +00:00
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.SH DESCRIPTION
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Em_opt reads a compact EM-program, argument or standard input,
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and produces another compact EM program on standard output
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that is functionally equivalent,
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but smaller.
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Some other functions are here that make this program mandatory
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before running a codegenerator,
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it may be left out when interpretation is wanted.
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Flags recognized are:
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.IP -L
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Make a library module.
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This means that the output will start with a message giving
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the names of all exported entities in this module.
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.IP -n
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Do not optimize.
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No peephole optimizations will be performed,
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other functions will be carried out.
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1991-11-20 16:45:25 +00:00
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.IP -m<num>
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Try to replace multiplies with constants by combinations of shifts and adds,
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but no more than <num> of them. Integer overflow detection is lost with this
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option.
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.IP -ml<num>
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Like -m<num>, but also for long multiplies.
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1984-07-12 14:14:54 +00:00
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.SH "FILES"
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/usr/tmp/emopt??????, is used when the -L flag is given only.
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.SH "SEE ALSO"
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1991-11-20 16:45:25 +00:00
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ack(1)
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1984-07-12 14:14:54 +00:00
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.PD 0
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.IP [1]
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A.S. Tanenbaum, Hans van Staveren, Ed Keizer and Johan
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Stevenson "Description of a machine architecture for use with
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block structured languages" Informatica report IR-81.
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.SH AUTHOR
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Hans van Staveren, Vrije Universiteit
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