Re: is gcc optimized for g4 processors ?

Stephane GEORGES [off-list ref] 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


** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/