https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81904
--- Comment #5 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Richard Biener from comment #1)
> Hmm, I think the issue is we see
>
> f (__m128d x, __m128d y, __m128d z)
> {
> vector(2) double _4;
> vector(2) double _6;
>
> <bb 2> [100.00%]:
> _4 = x_2(D) * y_3(D);
> _6 = __builtin_ia32_addsubpd (_4, z_5(D)); [tail call]
We can fold the builtin into .VEC_ADDSUB, and optimize MUL + VEC_ADDSUB ->
VEC_FMADDSUB in match.pd?
