From: "Barry" <barry@nibelung.demon.co.uk>
To: <law@cygnus.com>
Cc: <egcs@cygnus.com>
Subject: RE: Penitum II & egcs 1.1.1 oddity
Date: Fri, 22 Jan 1999 08:32:00 -0000 [thread overview]
Message-ID: <000201be4624$e16f7e60$71aa989e@nibelung> (raw)
In-Reply-To: <9723.917018431@hurl.cygnus.com>
> > Does it make a lot of difference compiling using -march=pentium as
> > opposed to -march=pentiumpro on a Pentium II?
> "a lot" is a relative term.
>
> -march=pentiumpro will enable ppro specific instructions, namely
> conditional
> moves, which for some code can be a nice improvement. For other
> code it won't
> help in any noticable way. Just depends on your application.
>
Thanks for the information. I'd be correct in assuming
that -march=pentiumpro would never cause a loss of performance
over -march=pentium?
--
Barry
WARNING: multiple messages have this Message-ID
From: "Barry" <barry@nibelung.demon.co.uk>
To: <law@cygnus.com>
Cc: <egcs@cygnus.com>
Subject: RE: Penitum II & egcs 1.1.1 oddity
Date: Sun, 31 Jan 1999 23:58:00 -0000 [thread overview]
Message-ID: <000201be4624$e16f7e60$71aa989e@nibelung> (raw)
Message-ID: <19990131235800.2Z28qaTJCkNDGBq2rNa6a241V-XlAxf_89ziPsz9oaw@z> (raw)
In-Reply-To: <9723.917018431@hurl.cygnus.com>
> > Does it make a lot of difference compiling using -march=pentium as
> > opposed to -march=pentiumpro on a Pentium II?
> "a lot" is a relative term.
>
> -march=pentiumpro will enable ppro specific instructions, namely
> conditional
> moves, which for some code can be a nice improvement. For other
> code it won't
> help in any noticable way. Just depends on your application.
>
Thanks for the information. I'd be correct in assuming
that -march=pentiumpro would never cause a loss of performance
over -march=pentium?
--
Barry
next prev parent reply other threads:[~1999-01-22 8:32 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-01-22 3:18 Barry Shilliday
1999-01-22 7:24 ` Jeffrey A Law
1999-01-22 8:32 ` Barry [this message]
1999-01-22 8:56 ` Jeffrey A Law
1999-01-31 23:58 ` Jeffrey A Law
1999-01-31 23:58 ` Barry
1999-01-31 23:58 ` Jeffrey A Law
1999-01-31 23:58 ` Barry Shilliday
1999-01-22 19:05 N8TM
1999-01-23 5:36 ` Barry
1999-01-31 23:58 ` Barry
1999-01-31 23:58 ` N8TM
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