6.0-Current and gcc 4.x

[Steve Kargl]

On Sun, Jun 19, 2005 at 11:47:16AM +0200, O. Hartmann wrote:
> 
> Maybe this is a bit of off topic, but I'm curious about why gcc 4.0 let 
> FreeBSD run into performance penalties. May you give me a hint for 
> further digging the net? I'm interested in this.

GCC 4.0 has an entirely new infrastructure on which optimizations
are to be base (ie., tree-ssa).  Some of the optimizations available
in gcc 3.x are not yet available on 4.0.  Others require additional
tuning.  

> Well, the major intention is to use a faster C and/or free Fortran 
> compiler doing my numerical research on FreeBSD boxes. In most cases I 
> gained success on compiling Fortran90 code with PGI and/or Intel V8 
> compilers, running this code on FBSD 5.3/4 boxes within the Linuxulator. 
> I found out that some C code performs not that fast as  expected using 
> PGI or Intel C compiler, but Fortran code (F77) performs really faster 
> (fast in the manner of: it is useable!).
> On a pure AMD64-FreeBSD 5.4-STABLE box I feel like a dead man in the 
> water because I do not have access to a 64Bit Linuxulator using the 
> 64Bit versions of Intel or PGI (which gave me a real boost on our SuSE 
> Linux Cluster, but I do not wish to develop under Linux, sorry).

You should be able to install gcc 4.0.1 in /usr/local/ and use
it for your needs.  gfortran, the new Fortran 95 compiler, works
on most codes and I use it everyday.  There are some bugs in
complex modules and derived types, but the gfortran developers
are making good progress in killing off bugs.

troutmask:kargl[202] uname -m
amd64
troutmask:kargl[208] gfortran -v
Using built-in specs.
Target: amd64-unknown-freebsd6.0

-- 
Steve