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From: "sgk at troutmask dot apl.washington.edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/99840] [9/10/11 Regression] ICE in gfc_simplify_matmul, 
 at fortran/simplify.c:4777
Date: Wed, 31 Mar 2021 21:07:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99840

--- Comment #6 from Steve Kargl <sgk at troutmask dot apl.washington.edu> -=
--
On Wed, Mar 31, 2021 at 08:51:57PM +0000, anlauf at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99840
>=20
> --- Comment #5 from anlauf at gcc dot gnu.org ---
> OK, now I see it.  gfc_get_shape does not init the resulting shape.
> The following simpler patch does the job:
>=20
> diff --git a/gcc/fortran/simplify.c b/gcc/fortran/simplify.c
> index 388aca7c38c..c27b47aa98f 100644
> --- a/gcc/fortran/simplify.c
> +++ b/gcc/fortran/simplify.c
> @@ -8123,8 +8123,8 @@ gfc_simplify_transpose (gfc_expr *matrix)
>                                &matrix->where);
>    result->rank =3D 2;
>    result->shape =3D gfc_get_shape (result->rank);
> -  mpz_set (result->shape[0], matrix->shape[1]);
> -  mpz_set (result->shape[1], matrix->shape[0]);
> +  mpz_init_set (result->shape[0], matrix->shape[1]);
> +  mpz_init_set (result->shape[1], matrix->shape[0]);
>=20
>    if (matrix->ts.type =3D=3D BT_CHARACTER)
>      result->ts.u.cl =3D matrix->ts.u.cl;
>=20

The simple patch in comment #2 also works.=