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Re: GNU Fortran
- To: d dot love at dl dot ac dot uk, ray at ultramarine dot com
- Subject: Re: GNU Fortran
- From: N8TM at aol dot com
- Date: Fri, 22 Jan 1999 22:22:48 EST
- Cc: egcs-bugs at cygnus dot com, bart at cs dot tamu dot edu
In a message dated 1/22/99 1:40:37 PM Pacific Standard Time, d.love@dl.ac.uk
writes:
<< Ray> IRIX 5.3 (100 mhz IP20 processor)
Ray> Everything compiled fine, apprears to run ok, but execution
Ray> time is horrid. At least 2 time longer than SG f77.
Targeting the wrong CPU, perhaps? >>
My memory is a bit short here. If the IP20 is like the R8000, there are lots
of scheduling requirements for good performance which g77 and gnu-as can't
deal with, and this kind of performance problem is likely. With the R10000,
using SGI as, g77 usually gives 80% of the speed of SGI fortran. As g77
doesn't optimize for any particular mips cpu, you can't expect top performance
on the more esoteric versions.