[Bug tree-optimization/104357] Failure to use csinv instead of mvn+csel where possible

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104357
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> One thing I should note:
>   _7 = x_3(D) >= 0;
>   _6 = (unsigned char) _7;
>   _8 = -_6;
> 
> Should be done on the gimple level as:
> t = x_3(D) >> (sizeof(x_3(D))*8 - 1)
> _8 = (unsigned char)t;

Actually it is:
  _2 = x_3(D) >> 31;
  _5 = ~_2;
  _8 = (unsigned char) _5;