Re: Vector Extensions to C (SSE2 on X86)

[Amund Fjellheim <abc at lavacat dot com>]

Anyone fixing the documentation, then?

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