Changing CFLAGS for i386 packages on x86_64 (benchmarks included)

[dragoran]

Dave Jones wrote:
> On Sun, Jul 16, 2006 at 08:15:46AM -0400, Dave Jones wrote:
>  > On Sun, Jul 16, 2006 at 02:10:22PM +0200, dragoran wrote:
>  >  > I did same benchmarks using flops.c (attached) the results are attached 
>  >  > to it seems that
>  >  > -march=k8 -mtune=k8 -m32 is the fastes but not by much ...
>
> Additionally, whilst you found these flags speed things up
> slightly on AMD systems, it may have a noticable detrimental
> impact on Intel systems, and shipping multiple sets of binaries
> for a negligable speedup doesn't make a lot of sense.
>
>   
this might be true but unfortunatelly I don't have a system to test 
(only dc opteron running FC5 and amd64 3000+ running rawhide)
>  >  > the last one (-m64) is weird (much slower!!) no -OX was used.
>
> When run in 32bit, this is doubling the amount of loads/stores used,
> so little wonder it's slower.
>   
what do you mean by "when run in 32bit" ? the resulting binary was a 
x86_64 one ??
> 		Dave
>
>