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Re: Vector Extensions to C (SSE2 on X86)


Amund Fjellheim <abc@lavacat.com> writes:

> Anyone fixing the documentation, then?

Volunteers are always welcome.

Ian

> Den 1. aug. 2006 kl. 15.51 skrev Ian Lance Taylor:
> 
> > Amund Fjellheim <abc@lavacat.com> writes:
> >
> >> GCC has some support for vector instructions through typedef'ed types
> >> like this:
> >> typedef int v4si __attribute__ ((vector_size (16)));
> >>
> >> Some normal C operators can be done on these and there are some
> >> platform specific built in functions. The X86 functions are listed at
> >> http://gcc.gnu.org/onlinedocs/gcc-4.1.1/gcc/X86-Built_002din-
> >> Functions.html#X86-Built_002din-Functions , but there are lots of
> >> SSE2 instructions missing. Why? I don't see how it could be so hard
> >> to implement
> >>
> >> v4si __builtin_ia32_pslld(v4si, int)
> >>
> >> and so on, when so many other SSE and SSE2 instructions are there.
> >> Also, why aren't they available for C++ programs compiled with g++?
> >>
> >> Will these things be fixed in future releases of gcc? Anyone know
> >> something about the status on this?
> >
> > It is a documentation failure.  gcc's current goal is to implement the
> > Intel intrinsic functions, providing mmintrin.h and friends:
> >     http://www.intel.com/cd/ids/developer/asmo-na/eng/59644.htm
> >
> > So, to get pslld, you would use _m_pslld or _m_pslldi, etc.
> >
> > Ian


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