[ODE] Some SSE in Quick step

[tbp]

GARY VANSICKLE wrote:
>>Picking the proper dll at runtime may be equivalent (more or less) to
>>some jumptable adjustment (ie on windows), but it puts some of the
>>burden on the toolchain as it relies on compiler/linker mechanisms.
> 
> Huh?  No, it relies on the OS's runtime library loading support.
Guess what, on windows, delay loading a dll (in Microsoft speakage aka 
picking the proper dll at runtime) amounts to some jumptable adjustment.
In the function table (IAT) each symbol initially points to a thunk that 
one way or another grabs the final function address.
Even when there's no delay loading going on (but external linkage), 
there's an IAT. It's part of the PE format.

>>Again those 2 solutions (linking against different ode libs vs D3D)
>>aren't equivalent.
> 
> Wait, now you're talking about completely different *ode* libs?!?  When did
> we switch from talking about *math* libraries?
At the moment one realized they had little to offer in the present case.

>>In the former every paths are optmized for one combo (cpu/features).
> 
> Again, how many combos do you need to ship?
At least one.