On Sun, 2010-12-05 at 08:06 +0900, Takeshi Abe wrote:
> > apparently -mtune=atom require gcc 4.5. I think that commit need to
> Thanks for that information. I became eager for gcc 4.5 :)
Lol :-) the background here is (AFAIR) that in the Atom - in order to
get the die area down to some tiny 5x5mm square - and the power right
down, Intel binned some huge chunk of logic to do all but the most
simple instruction re-ordering and dropped speculative execution and
register renaming.
As such, the same code compiled in a slightly different order can be
substantially faster on Atom than the same instructions in a different
order on the same Atom :-)
Of course, for those of us with non-Atom CPUs, the change is (most
likely) negligable: we already had all those shuffling transistors
sitting around anyway.
OTOH, gcc 4.5 is no doubt better in lots of other ways ;-)
HTH,
Michael.
--
michael.me...@novell.com <><, Pseudo Engineer, itinerant idiot
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