Re: Modulo n arithmetics

johnr@ee.uts.edu.au (John Reekie)
Tue, 17 Nov 1992 06:35:42 GMT

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Newsgroups: comp.compilers
From: johnr@ee.uts.edu.au (John Reekie)
Organization: Compilers Central
Date: Tue, 17 Nov 1992 06:35:42 GMT
Keywords: arithmetic, DSP
References: 92-11-029

>I am wondering if any languages or application heavily rely on
>modulo arithmetics


Realtime digital signal processing uses modulo addressing ranges a _lot_
for circular buffers and shift registers (for signal delays, digital
filters, convolution, correlation). Most DSP chips have special hardware
and registers to support this addressing mode -- that is, an address
register that goes below a given base address or above a limit address is
"wrapped" back to the end or start of the range. Unfortunately, most
compilers do not at present support this hardware feature (0.5 of an
exception that I know of), mainly because the source language usually used
(i.e. C) has no way of expressing it.


Regards


John Reekie
--

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