[Bug target/80160] [7 regression] operand has impossible constraints

[vmakarov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80160

--- Comment #5 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
(In reply to Bernd Schmidt from comment #4)
> Perhaps this.
> 
> Index: lra-assigns.c
> ===================================================================
> --- lra-assigns.c	(revision 246226)
> +++ lra-assigns.c	(working copy)
> @@ -908,7 +908,8 @@ must_not_spill_p (unsigned spill_regno)
>       does not solve the general case where existing reloads fully
>       cover a limited register class.  */
>    if (!bitmap_bit_p (&non_reload_pseudos, spill_regno)
> -      && reg_class_size [reg_preferred_class (spill_regno)] == 1)
> +      && reg_class_size [reg_preferred_class (spill_regno)] == 1
> +      && reg_alternate_class (spill_regno) == NO_REGS)
>      return true;
>    return false;
>  }

It looks OK to me.  Bernd, please, go ahead and commit it (of course after
successful testing).

Thanks for the fast response.