[gcc r12-5480] Fortran: do not attempt simplification of [LU]BOUND for pointer/allocatable

[Harald Anlauf <anlauf@gcc.gnu.org>]

https://gcc.gnu.org/g:16e95050f71e9fa408e9bd8ccd415b0e7adc66e5

commit r12-5480-g16e95050f71e9fa408e9bd8ccd415b0e7adc66e5
Author: Harald Anlauf <anlauf@gmx.de>
Date:   Tue Nov 23 21:39:36 2021 +0100

    Fortran: do not attempt simplification of [LU]BOUND for pointer/allocatable
    
    gcc/fortran/ChangeLog:
    
            PR fortran/103392
            * simplify.c (simplify_bound): Do not try to simplify
            LBOUND/UBOUND for arrays with POINTER or ALLOCATABLE attribute.
    
    gcc/testsuite/ChangeLog:
    
            PR fortran/103392
            * gfortran.dg/bound_simplification_7.f90: New test.

Diff:
---
 gcc/fortran/simplify.c                               |  6 ++++++
 gcc/testsuite/gfortran.dg/bound_simplification_7.f90 | 18 ++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/gcc/fortran/simplify.c b/gcc/fortran/simplify.c
index 6a6b3fbd037..c9e13b59da9 100644
--- a/gcc/fortran/simplify.c
+++ b/gcc/fortran/simplify.c
@@ -4266,6 +4266,12 @@ simplify_bound (gfc_expr *array, gfc_expr *dim, gfc_expr *kind, int upper)
 	     || (as->type == AS_ASSUMED_SHAPE && upper)))
     return NULL;
 
+  /* 'array' shall not be an unallocated allocatable variable or a pointer that
+     is not associated.  */
+  if (array->expr_type == EXPR_VARIABLE
+      && (gfc_expr_attr (array).allocatable || gfc_expr_attr (array).pointer))
+    return NULL;
+
   gcc_assert (!as
 	      || (as->type != AS_DEFERRED
 		  && array->expr_type == EXPR_VARIABLE
diff --git a/gcc/testsuite/gfortran.dg/bound_simplification_7.f90 b/gcc/testsuite/gfortran.dg/bound_simplification_7.f90
new file mode 100644
index 00000000000..3efecdff769
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/bound_simplification_7.f90
@@ -0,0 +1,18 @@
+! { dg-do compile }
+! PR fortran/103392 - ICE in simplify_bound
+
+program p
+  integer, allocatable :: a(1:1) ! { dg-error "deferred shape or assumed rank" }
+  integer :: b(1) = lbound(a)    ! { dg-error "does not reduce" }
+  integer :: c(1) = ubound(a)    ! { dg-error "does not reduce" }
+end
+
+subroutine s(x, y)
+  type t
+     integer :: i(3)
+  end type t
+  type(t), pointer     :: x(:)
+  type(t), allocatable :: y(:)
+  integer, parameter   :: m(1) = ubound (x(1)% i)
+  integer              :: n(1) = ubound (y(1)% i)
+end subroutine s