[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

Re: Changing CFLAGS for i386 packages on x86_64



On Fri, 2006-07-14 at 09:03 +0000, Kevin Kofler wrote:
> Arjan van de Ven <arjan <at> fenrus.demon.nl> writes:
> > SSE in 32 bit is not "just used" by gcc
> 
> What about -ftree-vectorize? 

that is, on 32 bit, not so cheap since it means transfering FP from the
x87 fpu to sse and back a lot.

> And -mfpmath=sse?

doesn't that also change the ABI?

All this SSE stuff is really useful for 64 bit x86... but for 32 bit...
a LOT less so due to the ABI/calling convention restrictions that 32 bit
suffers from.


[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]