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Re: best optimization under IRIX ?
- To: mk at baerlap dot north dot de
- Subject: Re: best optimization under IRIX ?
- From: Erik Mouw <J dot A dot K dot Mouw at its dot tudelft dot nl>
- Date: Wed 06 Sep 2000 12:17:05 +0100 (MDT)
- Cc: gcc at gcc dot gnu dot org
- Organization: Eric conspiracy secret labs
On Wed, 6 Sep 2000 05:20:36 +0200, Matthias Kurz wrote:
> What are the optimization options that give the maximum speed on
> a O2000/R10000 ?
I usually use (on an Onyx2/R12000):
-O2 -mabi=n32 -mips4 -mcpu=r8000 -funroll-loops -fomit-frame-pointer
> Currently the native "cc" with "-32 -Ofast=IP27" generates code that runs
> twice as fast as "gcc -mabi=n32 -O3 -mips3 -r4000".
Depends a lot on the source code. I have examples where gcc-2.95.2
generates code that runs three to four times as fast as the native MipsPRO
C compiler.
> I see neither -mips4 nor -r10000 in the man page.
The manpage is not up to date. Read the info files.
Erik
--
J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department
of Electrical Engineering, Faculty of Information Technology and Systems,
Delft University of Technology, PO BOX 5031, 2600 GA Delft, The Netherlands
Phone: +31-15-2783635 Fax: +31-15-2781843 Email: J.A.K.Mouw@its.tudelft.nl
WWW: http://www-ict.its.tudelft.nl/~erik/