gcc speed

[Jochen Kuepper]

Citing from http://www.cs.utk.edu/~rwhaley/ATLAS/errata.html:

  Dec ALPHA compilers

  If you are using a DEC Alpha, it is extremely important to use gnu gcc,
  rather than egcs gcc. On my 533Mhz Dec ALPHA, using egcs 1.1.1 and gnu gcc
  2.8.1, gcc provides roughly 590 Mflop DGEMM, whereas egcs results in 520 or
  so. User's of DEC unix should be aware that cc should not be used to compile
  the generated code. The compiler does not allow the turning off of
  optimizations that cause optimal code to run slower, so you should compile
  these routines with gcc. 
  [snip]

What do you think about that. Has anybody else some numbers to compare ?

Greetings,
Jochen
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  Jochen Küpper

  Heinrich-Heine-Universität Düsseldorf     jochen@uni-duesseldorf.de
  Institut für Physikalische Chemie I
  Universitätsstr. 1, Geb 26.43 Raum 02.29     phone ++49-211-8113681
  40225 Düsseldorf                             fax   ++49-211-8115195
  Germany             http://www-public.rz.uni-duesseldorf.de/~jochen
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