[Bug target/96428] [nvptx] nvptx_gen_shuffle does not handle V2DI mode – Fails with an ICE

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96428

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Tentative patch:
...
diff --git a/gcc/config/nvptx/nvptx.c b/gcc/config/nvptx/nvptx.c
index d8a8fb2d55b..cf53a921e5b 100644
--- a/gcc/config/nvptx/nvptx.c
+++ b/gcc/config/nvptx/nvptx.c
@@ -1796,6 +1796,44 @@ nvptx_gen_shuffle (rtx dst, rtx src, rtx idx,
nvptx_shuffle_kind kind)
        end_sequence ();
       }
       break;
+    case E_V2SImode:
+      {
+       rtx src0 = gen_rtx_SUBREG (SImode, src, 0);
+       rtx src1 = gen_rtx_SUBREG (SImode, src, 4);
+       rtx dst0 = gen_rtx_SUBREG (SImode, dst, 0);
+       rtx dst1 = gen_rtx_SUBREG (SImode, dst, 4);
+       rtx tmp0 = gen_reg_rtx (SImode);
+       rtx tmp1 = gen_reg_rtx (SImode);
+       start_sequence ();
+       emit_insn (gen_movsi (tmp0, src0));
+       emit_insn (gen_movsi (tmp1, src1));
+       emit_insn (nvptx_gen_shuffle (tmp0, tmp0, idx, kind));
+       emit_insn (nvptx_gen_shuffle (tmp1, tmp1, idx, kind));
+       emit_insn (gen_movsi (dst0, tmp0));
+       emit_insn (gen_movsi (dst1, tmp1));
+       res = get_insns ();
+       end_sequence ();
+      }
+      break;
+    case E_V2DImode:
+      {
+       rtx src0 = gen_rtx_SUBREG (DImode, src, 0);
+       rtx src1 = gen_rtx_SUBREG (DImode, src, 8);
+       rtx dst0 = gen_rtx_SUBREG (DImode, dst, 0);
+       rtx dst1 = gen_rtx_SUBREG (DImode, dst, 8);
+       rtx tmp0 = gen_reg_rtx (DImode);
+       rtx tmp1 = gen_reg_rtx (DImode);
+       start_sequence ();
+       emit_insn (gen_movdi (tmp0, src0));
+       emit_insn (gen_movdi (tmp1, src1));
+       emit_insn (nvptx_gen_shuffle (tmp0, tmp0, idx, kind));
+       emit_insn (nvptx_gen_shuffle (tmp1, tmp1, idx, kind));
+       emit_insn (gen_movdi (dst0, tmp0));
+       emit_insn (gen_movdi (dst1, tmp1));
+       res = get_insns ();
+       end_sequence ();
+      }
+      break;
     case E_BImode:
       {
        rtx tmp = gen_reg_rtx (SImode);
...