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From: aeusesef@csun.UUCP (Sean Eric Fagan)
Newsgroups: comp.arch
Subject: Re: Dhrystones & string ops [Was vectors]
Message-ID: <712@csun.UUCP>
Date: Thu, 6-Aug-87 14:03:13 EDT
Article-I.D.: csun.712
Posted: Thu Aug  6 14:03:13 1987
Date-Received: Sun, 9-Aug-87 08:20:48 EDT
References: <279@diab.UUCP> <17780@amdcad.AMD.COM> <280@diab.UUCP>
Reply-To: aeusesef@csun.UUCP (Sean Eric Fagan)
Distribution: world
Organization: California State University, Northridge
Lines: 40
Keywords: String op's, Dhrystone, benchmarks

In article <280@diab.UUCP> pf@.UUCP (Per Fogelstrom) writes:
>In article <17780@amdcad.AMD.COM> tim@amdcad.UUCP (Tim Olson) writes:
>+------
>|Many processors have specialized instructions for strings -- Intel's 80x86
>|family (movs, cmps), AT&T's 32100 (strlen, strcmp), National's 32x32
>|family (movs, cmps), NEC's V70 (movc, cmpc), Fairchild's Clipper (movc,
>|cmpc macros).  However, most of these don't address "C-type" strings;
>|they require a character count as a parameter.
>+-------
>
>Wrong! At least in the NS32x32 case. They do address "C-type" strings
>-- 
>Per Fogelstrom,  Diab Data AB
>SNAIL: Box 2029, S-183 02 Taby, Sweden
>ANALOG: +46 8-7680660
>UUCP: seismo!mcvax!enea!diab!pf

Hold on!  The WE32100 chip *DOES* use C type strings.  The instructions,
incidentally, are STREND and STRCPY.  STREND uses %r0, and increments it
until it comes to a '\0', while STRCPY copies %r0 to %r1 until it comes to a
'\0'.  Unnecessary and useless fact designed to eat up line space so that
the news poster won't complain:  the 3B[5 at least] Unix that comes
with it (SysVr2.0) uses the STRCPY instruction for the strcpy() function,
but it does not use the STREND instruction for the strlen() routine.
And, the assembler requires that these instructions be in UPPER CASE.
Very strange machine.


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