===================================================================
@@ -34,6 +34,7 @@ static void optimize_namespace (gfc_namespace *);
static void optimize_assignment (gfc_code *);
static bool optimize_op (gfc_expr *);
static bool optimize_comparison (gfc_expr *, gfc_intrinsic_op);
+static bool optimize_trim (gfc_expr *);
/* Entry point - run all passes for a namespace. So far, only an
optimization pass is run. */
@@ -68,6 +69,10 @@ static int
optimize_expr (gfc_expr **e, int *walk_subtrees ATTRIBUTE_UNUSED,
void *data ATTRIBUTE_UNUSED)
{
+
+ if (optimize_trim (*e))
+ gfc_simplify_expr (*e, 0);
+
if ((*e)->expr_type == EXPR_OP && optimize_op (*e))
gfc_simplify_expr (*e, 0);
return 0;
@@ -395,6 +400,70 @@ optimize_comparison (gfc_expr *e, gfc_intrinsic_op
return false;
}
+/* Optimize a trim function by replacing it with an equivalent substring
+ involving a call to len_trim. This only works for expressions where
+ variables are trimmed. Return true if anything was modified. */
+
+static bool
+optimize_trim (gfc_expr *e)
+{
+ gfc_expr *a;
+ gfc_ref *ref;
+ gfc_expr *fcn;
+ gfc_actual_arglist *actual_arglist, *next;
+
+ if (e->ts.type != BT_CHARACTER || e->expr_type != EXPR_FUNCTION
+ || e->value.function.isym == NULL
+ || e->value.function.isym->id != GFC_ISYM_TRIM)
+ return false;
+
+ a = e->value.function.actual->expr;
+
+ if (a->expr_type != EXPR_VARIABLE)
+ return false;
+
+ if (a->ref)
+ {
+ /* FIXME - also handle substring references, by modifying the
+ reference itself. Make sure not to evaluate functions in
+ the references twice. */
+ return false;
+ }
+ else
+ {
+ strip_function_call (e);
+
+ /* Create the reference. */
+
+ ref = gfc_get_ref ();
+ ref->type = REF_SUBSTRING;
+
+ /* Set the start of the reference. */
+
+ ref->u.ss.start = gfc_get_int_expr (gfc_default_integer_kind, NULL, 1);
+
+ /* Build the function call to len_trim(x, gfc_defaul_integer_kind). */
+
+ fcn = gfc_get_expr ();
+ fcn->expr_type = EXPR_FUNCTION;
+ fcn->value.function.isym =
+ gfc_intrinsic_function_by_id (GFC_ISYM_LEN_TRIM);
+ actual_arglist = gfc_get_actual_arglist ();
+ actual_arglist->expr = gfc_copy_expr (e);
+ next = gfc_get_actual_arglist ();
+ next->expr = gfc_get_int_expr (gfc_default_integer_kind, NULL,
+ gfc_default_integer_kind);
+ actual_arglist->next = next;
+ fcn->value.function.actual = actual_arglist;
+
+ /* Set the end of the reference to the call to len_trim. */
+
+ ref->u.ss.end = fcn;
+ e->ref = ref;
+ return true;
+ }
+}
+
#define WALK_SUBEXPR(NODE) \
do \
{ \