AltiVec support in GCC

Mike Stump
Fri Feb 18 18:47:00 GMT 2000

> Date: Fri, 18 Feb 2000 18:04:50 -0800
> From: Stan Shebs <>
> To: Mike Stump <>

> Since this is an extension to the dialect of C accepted by GCC, I
> would hope there would be some effort to define the dialect before
> putting in dueling patches. :-)

Well, people might say, this is how this vendor defined it, and we
want gcc to be compatible with it.  Fairly reasonable, though long
term, would be nice to do better than this, if we can.

> I don't know as much about the SSE situation, but the AltiVec
> extensions to C have been added to several other compilers


> and in real-world use for a while now, so there is an existing code
> base to consider.

Ditto (though I don't know how extensive their use it).

> Kumar has kindly provided the URLs to Motorola's spec; is there
> something similar for SSE that we can look at?

and if that doesn't work for any reason, you can find it at:

See section 3.1.3 and appendix C.

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