Vector parameter loads to SSE registers

[windigo84]

Hi Miles,

anyway I am not using dynamic memory; I am trying to load from the
parameters of the function. I don't understand at all if this has any
relation with libc. Anyway thanks for the information,

Janddro


Miles Bader-2 wrote:
> 
> Tim Prince <n8tm@aol.com> writes:
>> You would require  _attribute__(aligned) and similar gcc extensions to
>> inform the compiler about alignments so as to enable more use of aligned
>> instructions.  Without those, it's not practical to auto-vectorize short
>> loops, except by explicit low-level coding (e.g. sse intrinsics).  In
>> any case, a loop of trip 9 might not be efficiently vectorizable.
> 
> The problem I had when I played with this sort of thing before, was not
> gcc, but libc, which doesn't align general allocations enough for SSE
> (and I gather the libc devs have no intention of adding such a feature),
> so one needs to jump through a lot of hoops to make sure heap-allocated
> stuff is aligned properly.  It seemed like a big pain ...
> 
> -Miles
> 
> -- 
> Suburbia: where they tear out the trees and then name streets after them.
> 
> 

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