===================================================================
@@ -3445,6 +3445,39 @@ simplify_bound (gfc_expr *array, gfc_expr *dim, gf
done:
+ /* If the array shape is assumed shape or explicit, we can simplify lbound
+ to 1 if the given lower bound is one because this matches what lbound
+ should return for an empty array. */
+
+ if (!upper && as && dim && dim->expr_type == EXPR_CONSTANT
+ && (as->type == AS_ASSUMED_SHAPE || as->type == AS_EXPLICIT)
+ && ref->u.ar.type != AR_SECTION)
+ {
+ /* Watch out for allocatable or pointer dummy arrays, they can have
+ lower bounds that are not equal to one. */
+ if (!(array->symtree && array->symtree->n.sym
+ && (array->symtree->n.sym->attr.allocatable
+ || array->symtree->n.sym->attr.pointer)))
+ {
+ unsigned long int ndim;
+ gfc_expr *lower, *res;
+
+ ndim = mpz_get_si (dim->value.integer) - 1;
+ lower = as->lower[ndim];
+ if (lower->expr_type == EXPR_CONSTANT
+ && mpz_cmp_si (lower->value.integer, 1) == 0)
+ {
+ res = gfc_copy_expr (lower);
+ if (kind)
+ {
+ int nkind = mpz_get_si (kind->value.integer);
+ res->ts.kind = nkind;
+ }
+ return res;
+ }
+ }
+ }
+
if (as && (as->type == AS_DEFERRED || as->type == AS_ASSUMED_SHAPE
|| as->type == AS_ASSUMED_RANK))
return NULL;
===================================================================
@@ -20,7 +20,7 @@ end
! { dg-final { scan-tree-dump-times "mylcobound = 5;" 1 "original" } }
! { dg-final { scan-tree-dump-times "parm...dim\\\[1\\\].lbound = 5;" 1 "original" } }
! { dg-final { scan-tree-dump-times "myucobound =\[^\n\r\]* parm...dim\\\[1\\\].lbound \\+ \[^\n\r\]*_gfortran_caf_num_images \\(0, -1\\).? \\+ -?\[0-9\]+\\);" 1 "original" } }
-! { dg-final { scan-tree-dump-times "mylbound = parm...dim\\\[0\\\].stride >= 0 && parm...dim\\\[0\\\].ubound >= parm...dim\\\[0\\\].lbound \\|\\| parm...dim\\\[0\\\].stride < 0 \\?\[^\n\r\]* parm...dim\\\[0\\\].lbound : 1;" 1 "original" } }
+! { dg-final { scan-tree-dump-times "mylbound = 1;" 1 "original" } }
! { dg-final { scan-tree-dump-times "mythis_image = _gfortran_caf_this_image \\(0\\);" 1 "original" } }
! { dg-final { scan-tree-dump-times "bar \\(&parm.\[0-9\]+, caf_token.\[0-9\]+, \\(integer\\(kind=\[48\]\\)\\) parm.\[0-9\]+.data - \\(integer\\(kind=\[48\]\\)\\) x\\);" 1 "original" } }
! { dg-final { scan-tree-dump-times "_gfortran_caf_init \\(&argc, &argv\\);" 1 "original" } }