[Bug tree-optimization/104582] [11/12 Regression] Unoptimal code for __negdi2 (and others) from libgcc2 due to unwanted vectorization

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104582

--- Comment #18 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #6)
> Hmm:
>  _14 = {_1, _5};
>   _8 = VIEW_CONVERT_EXPR<__int128>(_14);
> 
> Wouldn't it better to convert that to just (hopefully I got the order
> correct):
> t1 = (__128)_1
> _8 = BIT_INSERT_EXPR(t1, 64, _5);
> 
> ?

I filed that as PR 104600 since it might be useful in the general case too.