[PATCH] x86: _mm*_undefined_* (for real)

[Kirill Yukhin]

Hello Ulrich,
On 21 Mar 06:41, Ulrich Drepper wrote:
> From personal experience I find it
> very frustrating if a gcc release doesn't have the complete set of
> intrinsics since then you have to provide your own implementations in
> code which doesn't assume the latest compiler.

I think I should mention here, that there're set of intrinsics which
didn't enter GCC. They fail review.
Initial submission: http://gcc.gnu.org/ml/gcc-patches/2013-08/msg00782.html
because of too complex pattern, UNSPECs were also rejected.

Although they seems to be rare in use, we might try to retry with review
if invent better MD description...

--
Thanks, K