is gcc optimized for g4 processors ?

[Holger Bettag]

Stephane GEORGES <sg at dalim.de> writes:

>
>
> I'm doing performance tests on my G4 - 400 AGP.
> I would like to know if gcc (egcs-2.91.66) can be optimized for G4 processor.
>
> Does -mcpu=7400 exists ?
>
I don't think the option is in there yet. But -mcpu=604e should fit the 7400
quite well, for both integer and floating point code. The only big scheduling
difference would be for integer multiplications.

(The 604e has a separate, pipelined integer multiplier, while the 7400's is
non-pipelined and blocks one of the integer units, but has an early-exit-
capability if one the factors has less than 32 significant bits.)

  Holger


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