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From: "jrfsousa at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/91726] [8/9 Regression] ICE in gfc_conv_array_ref, at
 fortran/trans-array.c:3612
Date: Thu, 01 Apr 2021 18:19:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D91726

--- Comment #9 from Jos=C3=A9 Rui Faustino de Sousa <jrfsousa at gmail dot =
com> ---
Hi Paul!

This seems to fix the ICE generated by using -ftrapv -fcheck=3Dbounds

Fixes "nelems" type and adds an optional assert to make sure it stays fixed.

Best regards,
Jos=C3=A9 Rui


diff --git a/gcc/fortran/trans-array.c b/gcc/fortran/trans-array.c
index be5eb89350f..7954b138605 100644
--- a/gcc/fortran/trans-array.c
+++ b/gcc/fortran/trans-array.c
@@ -9375,7 +9375,7 @@ structure_alloc_comps (gfc_symbol * der_type, tree de=
cl,
                                                        nelems));
                }
              else
-               nelems =3D build_int_cst (size_type_node, 1);
+               nelems =3D build_int_cst (gfc_array_index_type, 1);

              if (CLASS_DATA (c)->attr.dimension
                  || CLASS_DATA (c)->attr.codimension)

diff --git a/gcc/fortran/trans-expr.c b/gcc/fortran/trans-expr.c
index 2fa17b36c03..258e885faaa 100644
--- a/gcc/fortran/trans-expr.c
+++ b/gcc/fortran/trans-expr.c
@@ -1446,6 +1452,7 @@ gfc_copy_class_to_class (tree from, tree to, tree nel=
ems,
bool unlimited)
            name =3D (const char *)(DECL_NAME (to)->identifier.id.str);

          from_len =3D gfc_conv_descriptor_size (from_data, 1);
+         gcc_assert (TREE_TYPE (orig_nelems) =3D=3D gfc_array_index_type);
          tmp =3D fold_build2_loc (input_location, NE_EXPR,
                                  logical_type_node, from_len, orig_nelems);
          msg =3D xasprintf ("Array bound mismatch for dimension %d "=