[Bug target/94248] [amdgcn] Doesn't build with RTL checking

[tschwinge at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94248

--- Comment #2 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #1)
> --- gcc/config/gcn/gcn.md.jj	2020-03-03 07:57:42.363827602 +0100
> +++ gcc/config/gcn/gcn.md	2020-03-21 15:37:45.337552515 +0100
> @@ -625,7 +625,7 @@ (define_insn_and_split "*mov<mode>_insn"
>      rtx outhi = gen_highpart_mode (SImode, <MODE>mode, operands[0]);
>  
>      /* Ensure that overlapping registers aren't corrupted.  */
> -    if (REGNO (outlo) == REGNO (inhi))
> +    if (reg_overlap_mentioned_p (outlo, inhi))
>        {
>  	operands[0] = outhi;
>  	operands[1] = inhi;
> ought to fix this

I've tested that one; no more ICE, and bit-identical code for all target
libraries, so I suppose this is good to commit (Andrew, Julian)?  If approving
this patch, please respond with "Reviewed-by: NAME <EMAIL>" so that your effort
will be recorded in the commit log, see <https://gcc.gnu.org/wiki/Reviewed-by>.