Re: RFC: Policy for arch specs

[Galen Hazelwood <galenh@micron.net>]

Guy Maor wrote:
> I think the only optimization gcc 2.7.* does for i486 is instruction
> alignment.  The Pentium has a better fetch unit so doesn't need any
> alignment (it never incurs a misfetch penalty) so optimizing for i486
> will at least give some code bloat.

I think it also chooses some instructions differently for a 486, and
these choices are also good on the pentium.  That's why, when building
binaries for my use, I use -m486 but add flags which turn off the
alignment.

> I don't think it does any optimization at all for pentium.

True.  2.8 will have some stuff from pgcc, but not everything.

--Galen


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