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EnigmA Amiga Run 1999 March
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EnigmA AMIGA RUN 35 (1999)(G.R. Edizioni)(IT)[!][issue 1999-03].iso
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vsc.doc
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vsc - scheduler for vbcc (c) in 1997-99 by Volker Barthelmann
INTRODUCTION
vsc is an instruction-scheduler which reorders the assembly output of
vbcc and tries to improve performance of the generated code by avoiding
pipeline stalls etc.
Like the compiler vbcc it is split into a target independant and a
target dependant part. However there may be code-generators for vbcc
which do not have a corresponding scheduler.
This document only deals with the target independant parts of vsc.
Be sure to read all the documents for your machine.
NOTE: This is a pre-alpha-release! Doesn't really work!
LEGAL
vsc is (c) in 1997-99 by Volker Barthelmann.
vsc may be freely redistributed as long as no modifications are made
and nothing is charged for it.
Non-commercial usage of vsc is allowed without any restrictions.
Commercial usage needs my written consent.
Sending me money, gifts, postcards etc. would of course be very nice
and may encourage further development of vsc, but is not legally or
morally necessary to use vsc.
USAGE
Usually vsc will be called by a frontend. However if you call it
directly, it has to be done like this:
vsc [options] input-file output-file
The following options are supported:
-quiet Do not print the copyright notice.
-debug=<n> Set debug-level to <n>.
Note that depending on the target vbcc may insert hints into the
generated code to tell vsc what CPU to schedule for. Code
scheduled for a certain CPU may run much slower on slightly different
CPUs. Therefore it is especially important to specify the correct
target-CPU when compiling.
KNOWN PROBLEMS
Volker Barthelmann volker@vb.franken.de