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| From | Kaz Kylheku <kaz@kylheku.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: More efficient strcmp |
| Date | 2012-03-13 23:05 +0000 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <20120313155951.116@kylheku.com> (permalink) |
| References | <jjog0d$rcc$1@speranza.aioe.org> <jjogv1$iqp$2@dont-email.me> |
On 2012-03-13, Kleuske <kleuske@nowhere.net> wrote:
> On Tue, 13 Mar 2012 21:59:41 +0000, pembed2012 saw fit to publish the
>> int strcmp_fast(char* s,char* t){
>> uls=(unsigned long*)s;
>> ult=(unsigned long*)t;
>> if(*uls>*ult) return(1);
>> if(*uls<*ult) return(-1);
>> else return(strcmp(s,t));
>> }
>
> What if the strings are longer than an unsigned long and differ only in the
> last bit?
More importantly, what if they are shorter?
What if the compiler doesn't like the aliasing?
Also, this fails on x86 and elsewhere, because strings, if treated as numbers this way, are
big-endian.
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More efficient strcmp pembed2012 <once@was.enough.invalid> - 2012-03-13 21:59 +0000
Re: More efficient strcmp Kleuske <kleuske@nowhere.net> - 2012-03-13 22:16 +0000
Re: More efficient strcmp "BartC" <bc@freeuk.com> - 2012-03-13 22:25 +0000
Re: More efficient strcmp Kleuske <kleuske@nowhere.net> - 2012-03-14 16:02 +0000
Re: More efficient strcmp James Kuyper <jameskuyper@verizon.net> - 2012-03-13 18:30 -0400
Re: More efficient strcmp Kaz Kylheku <kaz@kylheku.com> - 2012-03-13 23:05 +0000
Re: More efficient strcmp James Kuyper <jameskuyper@verizon.net> - 2012-03-13 18:19 -0400
Re: More efficient strcmp jacob navia <jacob@spamsink.net> - 2012-03-13 23:54 +0100
Re: More efficient strcmp Gareth Owen <gwowen@gmail.com> - 2012-03-14 06:37 +0000
Re: More efficient strcmp James Kuyper <jameskuyper@verizon.net> - 2012-03-14 07:32 -0400
Re: More efficient strcmp Stephen Sprunk <stephen@sprunk.org> - 2012-03-13 17:28 -0500
Re: More efficient strcmp Robert Wessel <robertwessel2@yahoo.com> - 2012-03-13 17:28 -0500
Re: More efficient strcmp Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-03-13 22:43 +0000
Re: More efficient strcmp "Joachim Schmitz" <nospam.jojo@schmitz-digital.de> - 2012-03-16 17:39 +0100
Re: More efficient strcmp Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-03-16 18:17 +0000
Re: More efficient strcmp Kaz Kylheku <kaz@kylheku.com> - 2012-03-13 23:03 +0000
Re: More efficient strcmp Fritz Wuehler <fritz@spamexpire-201203.rodent.frell.theremailer.net> - 2012-03-14 15:55 +0100
Re: More efficient strcmp Kenneth Brody <kenbrody@spamcop.net> - 2012-03-14 14:19 -0400
Re: More efficient strcmp "BartC" <bc@freeuk.com> - 2012-03-13 23:25 +0000
Re: More efficient strcmp Bl0ckeduser <bl0ckedusersoft@gmail.com> - 2012-03-13 21:42 -0500
Re: More efficient strcmp Tim Rentsch <txr@alumni.caltech.edu> - 2012-03-14 15:17 -0700
Re: More efficient strcmp Bl0ckeduser <bl0ckedusersoft@gmail.com> - 2012-03-14 19:06 -0400
Re: More efficient strcmp Tim Rentsch <txr@alumni.caltech.edu> - 2012-03-15 18:53 -0700
Re: More efficient strcmp Andre <lodwig@pathme.de> - 2012-03-14 14:26 +0100
Re: More efficient strcmp China Blue Water Navy <chine.bleu@yahoo.com> - 2012-03-14 12:39 -0700
Re: More efficient strcmp vaysagekv <kvvaysage@gmail.com> - 2012-03-15 18:24 +0530
Re: More efficient strcmp gof@somewhere.invalid (Gof) - 2012-03-15 13:00 +0000
Re: More efficient strcmp "BartC" <bc@freeuk.com> - 2012-03-15 15:05 +0000
Re: More efficient strcmp Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-03-25 16:45 +0000
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