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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/94248] [amdgcn] Doesn't build with RTL checking
Date: Sat, 21 Mar 2020 14:39:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94248

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2020-03-21
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Either:
--- gcc/config/gcn/gcn.md.jj    2020-03-03 07:57:42.363827602 +0100
+++ gcc/config/gcn/gcn.md       2020-03-21 15:35:22.395639196 +0100
@@ -625,7 +625,7 @@ (define_insn_and_split "*mov<mode>_insn"
     rtx outhi =3D gen_highpart_mode (SImode, <MODE>mode, operands[0]);

     /* Ensure that overlapping registers aren't corrupted.  */
-    if (REGNO (outlo) =3D=3D REGNO (inhi))
+    if (REG_P (inhi) && REGNO (outlo) =3D=3D REGNO (inhi))
       {
        operands[0] =3D outhi;
        operands[1] =3D inhi;
or:
--- 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 =3D gen_highpart_mode (SImode, <MODE>mode, operands[0]);

     /* Ensure that overlapping registers aren't corrupted.  */
-    if (REGNO (outlo) =3D=3D REGNO (inhi))
+    if (reg_overlap_mentioned_p (outlo, inhi))
       {
        operands[0] =3D outhi;
        operands[1] =3D inhi;
ought to fix this, but I don't yet have setup where I can sufficiently test=
 it.
I think the latter is better and is in line what other backends are using.=