diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog
index da9cf10dd68..f962ca93f29 100644
--- a/gcc/fortran/ChangeLog
+++ b/gcc/fortran/ChangeLog
@@ -1,3 +1,14 @@
+2017-05-14  Nicolas Koenig  <koenigni@student.ethz.ch>
+
+	PR fortran/80442
+	* array.c (gfc_ref_dimen_size): Simplify stride
+	expression
+	* data.c (gfc_advance_section): Simplify start,
+	end and stride expressions
+	(gfc_advance_section): Simplify start and end
+	expressions
+	(gfc_get_section_index): Simplify start expression 
+
 2017-05-13  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	* io.c (gfc_resolve_dt): Fix returns to bool type.
diff --git a/gcc/fortran/array.c b/gcc/fortran/array.c
index ec0c26656ff..30656c197d0 100644
--- a/gcc/fortran/array.c
+++ b/gcc/fortran/array.c
@@ -2201,6 +2201,7 @@ gfc_ref_dimen_size (gfc_array_ref *ar, int dimen, mpz_t *result, mpz_t *end)
   mpz_t upper, lower, stride;
   mpz_t diff;
   bool t;
+  gfc_expr *stride_expr = NULL;
 
   if (dimen < 0 || ar == NULL || dimen > ar->dimen - 1)
     gfc_internal_error ("gfc_ref_dimen_size(): Bad dimension");
@@ -2225,12 +2226,16 @@ gfc_ref_dimen_size (gfc_array_ref *ar, int dimen, mpz_t *result, mpz_t *end)
 	mpz_set_ui (stride, 1);
       else
 	{
-	  if (ar->stride[dimen]->expr_type != EXPR_CONSTANT)
+	  stride_expr = gfc_copy_expr(ar->stride[dimen]); 
+	  if(!gfc_simplify_expr(stride_expr, 1))
+	    gfc_internal_error("Simplification error");
+	  if (stride_expr->expr_type != EXPR_CONSTANT)
 	    {
 	      mpz_clear (stride);
 	      return false;
 	    }
-	  mpz_set (stride, ar->stride[dimen]->value.integer);
+	  mpz_set (stride, stride_expr->value.integer);
+	  gfc_free_expr(stride_expr);
 	}
 
       /* Calculate the number of elements via gfc_dep_differce, but only if
diff --git a/gcc/fortran/data.c b/gcc/fortran/data.c
index 184e53d480f..587161ff09d 100644
--- a/gcc/fortran/data.c
+++ b/gcc/fortran/data.c
@@ -539,6 +539,7 @@ gfc_advance_section (mpz_t *section_index, gfc_array_ref *ar,
   mpz_t tmp; 
   bool forwards;
   int cmp;
+  gfc_expr *start, *end, *stride;
 
   for (i = 0; i < ar->dimen; i++)
     {
@@ -547,12 +548,16 @@ gfc_advance_section (mpz_t *section_index, gfc_array_ref *ar,
 
       if (ar->stride[i])
 	{
+	  stride = gfc_copy_expr(ar->stride[i]);
+	  if(!gfc_simplify_expr(stride, 1))
+	    gfc_internal_error("Simplification error");
 	  mpz_add (section_index[i], section_index[i],
-		   ar->stride[i]->value.integer);
-	if (mpz_cmp_si (ar->stride[i]->value.integer, 0) >= 0)
-	  forwards = true;
-	else
-	  forwards = false;
+		   stride->value.integer);
+	  if (mpz_cmp_si (stride->value.integer, 0) >= 0)
+	    forwards = true;
+	  else
+	    forwards = false;
+	  gfc_free_expr(stride);	
 	}
       else
 	{
@@ -561,7 +566,13 @@ gfc_advance_section (mpz_t *section_index, gfc_array_ref *ar,
 	}
       
       if (ar->end[i])
-	cmp = mpz_cmp (section_index[i], ar->end[i]->value.integer);
+        {
+	  end = gfc_copy_expr(ar->end[i]);
+	  if(!gfc_simplify_expr(end, 1))
+	    gfc_internal_error("Simplification error");
+	  cmp = mpz_cmp (section_index[i], end->value.integer);
+	  gfc_free_expr(end);	
+	}
       else
 	cmp = mpz_cmp (section_index[i], ar->as->upper[i]->value.integer);
 
@@ -569,7 +580,13 @@ gfc_advance_section (mpz_t *section_index, gfc_array_ref *ar,
 	{
 	  /* Reset index to start, then loop to advance the next index.  */
 	  if (ar->start[i])
-	    mpz_set (section_index[i], ar->start[i]->value.integer);
+	    {
+	      start = gfc_copy_expr(ar->start[i]);
+	      if(!gfc_simplify_expr(start, 1))
+	        gfc_internal_error("Simplification error");
+	      mpz_set (section_index[i], start->value.integer);
+	      gfc_free_expr(start); 
+	    }
 	  else
 	    mpz_set (section_index[i], ar->as->lower[i]->value.integer);
 	}
@@ -679,6 +696,7 @@ gfc_get_section_index (gfc_array_ref *ar, mpz_t *section_index, mpz_t *offset)
   int i;
   mpz_t delta;
   mpz_t tmp;
+  gfc_expr *start;
 
   mpz_set_si (*offset, 0);
   mpz_init (tmp);
@@ -692,11 +710,15 @@ gfc_get_section_index (gfc_array_ref *ar, mpz_t *section_index, mpz_t *offset)
 	case DIMEN_RANGE:
 	  if (ar->start[i])
 	    {
-	      mpz_sub (tmp, ar->start[i]->value.integer,
+	      start = gfc_copy_expr(ar->start[i]);
+	      if(!gfc_simplify_expr(start, 1))
+	        gfc_internal_error("Simplification error");
+	      mpz_sub (tmp, start->value.integer,
 		       ar->as->lower[i]->value.integer);
 	      mpz_mul (tmp, tmp, delta);
 	      mpz_add (*offset, tmp, *offset);
-	      mpz_set (section_index[i], ar->start[i]->value.integer);
+	      mpz_set (section_index[i], start->value.integer);
+	      gfc_free_expr(start);
 	    }
 	  else
 	      mpz_set (section_index[i], ar->as->lower[i]->value.integer);
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index c7e2dec9681..4713ecdf534 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2017-05-14  Nicolas Koenig  <koenigni@student.ethz.ch>
+
+	PR fortran/80442
+	* gfortran.dg/impl_do_var_data.f90: New Test
+
 2017-05-13  Pekka Jääskeläinen  <pekka.jaaskelainen@parmance.com>
 
 	* brig.dg/test/gimple/priv-array-offset-access.hsail:
diff --git a/gcc/testsuite/gfortran.dg/impl_do_var_data.f90 b/gcc/testsuite/gfortran.dg/impl_do_var_data.f90
new file mode 100644
index 00000000000..191562d61fd
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/impl_do_var_data.f90
@@ -0,0 +1,12 @@
+! { dg-do run }
+! PR 80442
+! This test case used to produce an bogus error
+! about the variables being below the lower
+! array bounds
+program main
+    implicit none
+    integer:: i
+    integer, dimension(3):: A
+    data (A(i:i+2:i+1), i=1,2) /1, 2, 3/
+    if(any(A .ne. [1,3,2])) call abort()
+end program