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Groups > comp.lang.forth > #23748
| Date | 2013-06-17 22:11 -1000 |
|---|---|
| From | "Elizabeth D. Rather" <erather@forth.com> |
| Organization | FORTH, Inc. |
| Newsgroups | comp.lang.forth |
| Subject | Re: Moving 2/ from assembler to loadable extension |
| References | (5 earlier) <1x8xyx5q30urn.1fkwzme6d87l2.dlg@40tude.net> <kpmt8u$65c$1@online.de> <n5bf1wplvvg.1tzdamt947ck6.dlg@40tude.net> <kpo3pp$8cu$1@online.de> <2013Jun18.094158@mips.complang.tuwien.ac.at> |
| Message-ID | <0PWdnWPaONLai13MnZ2dnUVZ_tKdnZ2d@supernews.com> (permalink) |
On 6/17/13 9:41 PM, Anton Ertl wrote: > Bernd Paysan <bernd.paysan@gmx.de> writes: >> You can do SM/REM with IDIV, and FM/MOD, too, with a conditional decrement >> and add after doing so. > > You can also do SM/REM and FM/MOD based on UM/MOD, and for FM/MOD it's > better to use UM/MOD than SM/REM. > >> In the end, I suppose modern CPUs have just a DIV circuit, and the IDIV >> logic is injected as several additional operations. > > Yes, and the additional logic is broken on the 88100. If you care anything at all about performance, you will make your divide operators primitives. SM/REM and FM/MOD are mostly useful for programs that need the other option from the one a particular implementation is using. Cheers, Elizabeth -- ================================================== Elizabeth D. Rather (US & Canada) 800-55-FORTH FORTH Inc. +1 310.999.6784 5959 West Century Blvd. Suite 700 Los Angeles, CA 90045 http://www.forth.com "Forth-based products and Services for real-time applications since 1973." ==================================================
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Moving 2/ from assembler to loadable extension albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-06-10 14:10 +0000
Re: Moving 2/ from assembler to loadable extension The Beez <the.beez.speaks@gmail.com> - 2013-06-10 08:12 -0700
Re: Moving 2/ from assembler to loadable extension Coos Haak <chforth@hccnet.nl> - 2013-06-10 21:50 +0200
Re: Moving 2/ from assembler to loadable extension anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-06-11 12:52 +0000
Re: Moving 2/ from assembler to loadable extension Sieur de Bienville <morrimichael@gmail.com> - 2013-06-15 21:21 -0700
Re: Moving 2/ from assembler to loadable extension Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-06-16 09:41 -0500
Re: Moving 2/ from assembler to loadable extension Bernd Paysan <bernd.paysan@gmx.de> - 2013-06-16 22:50 +0200
Re: Moving 2/ from assembler to loadable extension Coos Haak <chforth@hccnet.nl> - 2013-06-17 01:21 +0200
Re: Moving 2/ from assembler to loadable extension Bernd Paysan <bernd.paysan@gmx.de> - 2013-06-17 13:51 +0200
Re: Moving 2/ from assembler to loadable extension Coos Haak <chforth@hccnet.nl> - 2013-06-17 17:04 +0200
Re: Moving 2/ from assembler to loadable extension Coos Haak <chforth@hccnet.nl> - 2013-06-17 17:07 +0200
Re: Moving 2/ from assembler to loadable extension Bernd Paysan <bernd.paysan@gmx.de> - 2013-06-18 00:49 +0200
Re: Moving 2/ from assembler to loadable extension anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-06-18 07:41 +0000
Re: Moving 2/ from assembler to loadable extension "Elizabeth D. Rather" <erather@forth.com> - 2013-06-17 22:11 -1000
Re: Moving 2/ from assembler to loadable extension Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-06-18 04:13 -0500
Re: Moving 2/ from assembler to loadable extension Coos Haak <chforth@hccnet.nl> - 2013-06-18 13:37 +0200
Re: Moving 2/ from assembler to loadable extension Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-06-18 09:42 -0500
Re: Moving 2/ from assembler to loadable extension anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-06-18 15:51 +0000
Re: Moving 2/ from assembler to loadable extension Coos Haak <chforth@hccnet.nl> - 2013-06-18 22:52 +0200
Re: Moving 2/ from assembler to loadable extension albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-06-19 00:12 +0000
Re: Moving 2/ from assembler to loadable extension albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-06-17 19:55 +0000
Re: Moving 2/ from assembler to loadable extension anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-06-17 16:04 +0000
Re: Moving 2/ from assembler to loadable extension Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-06-17 16:16 -0500
Re: Moving 2/ from assembler to loadable extension albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-06-17 22:59 +0000
Euclidian division (was: Moving 2/ from assembler ...) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-06-18 07:49 +0000
Re: Moving 2/ from assembler to loadable extension rickman <gnuarm@gmail.com> - 2013-06-18 17:29 -0400
Re: Moving 2/ from assembler to loadable extension Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-06-18 18:18 -0500
Re: Moving 2/ from assembler to loadable extension rickman <gnuarm@gmail.com> - 2013-06-18 19:47 -0400
Re: Moving 2/ from assembler to loadable extension albert@spenarnc.xs4all.nl (Albert van der Horst) - 2013-06-19 00:16 +0000
Re: Moving 2/ from assembler to loadable extension Bernd Paysan <bernd.paysan@gmx.de> - 2013-06-19 15:09 +0200
Re: Moving 2/ from assembler to loadable extension rickman <gnuarm@gmail.com> - 2013-06-19 17:55 -0400
Euclidian Division (was: Moving 2/ from assembler ...) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-06-28 14:49 +0000
Re: Euclidian Division Andrew Haley <andrew29@littlepinkcloud.invalid> - 2013-06-28 11:20 -0500
Re: Moving 2/ from assembler to loadable extension Marc Olschok <nobody@nowhere.invalid> - 2013-06-19 23:11 +0000
Re: Moving 2/ from assembler to loadable extension Pablo Hugo Reda <pabloreda@gmail.com> - 2013-06-18 17:05 -0700
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