Re: Intrinsics with -march=pentium3

[Jean-Marc Valin <Jean-Marc dot Valin at USherbrooke dot ca>]

> Wouldn't you compile the SSE routine in one source file with the switch, and the non-SSE routine in a different source file (along with all the rest of the other source code) without the switch.

I guess I can always do that, but it's going to be messy trying to tell
autoconf "compile this file with a different switch and only if this
switch is enabled". Any idea how one would do that?

> Then algorithmically determine if the SSE support is available and programmatically set a function pointer to the correct routine, and utilize the SSE or non-SSE routine via that function pointer mechanism.

For simple functions, wouldn't that be slower than a plain "if" because
of the branch prediction?

	Jean-Marc

-- 
Jean-Marc Valin, M.Sc.A., ing. jr.
LABORIUS (http://www.gel.usherb.ca/laborius)
Université de Sherbrooke, Québec, Canada

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