Changing CFLAGS for i386 packages on x86_64

[dragoran]

Arjan van de Ven wrote:
> 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.
>
>   
ok but why isn't it enabled on x86_64 (for 64bit apps)
the packages are compiled with
-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions 
-fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic
(this is shown in about:buildconfig in 64bit mozilla)
>> 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.
>
>