[Bug rtl-optimization/121546] [16 Regression] GCN: 'gfortran.fortran-torture/compile/pr66251.f90' ICE 'during RTL pass: combine', 'in require, at machmode.h:323'

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121546

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1) 
> > (subreg:SI (reg:V64DF 2724) 0)
> 
> Is that even valid beforehand?

To answer this question, yes it is valid. It is lowpart subreg which is
basically equalivant to doing:
(vec_select:SI (subreg:V128SI (reg:V64DF 2724)) (const_int 0))

The question in comment #2 about the right place is still an open question
though.