diff options
Diffstat (limited to 'gcc/fortran/trans-expr.c')
| -rw-r--r-- | gcc/fortran/trans-expr.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/gcc/fortran/trans-expr.c b/gcc/fortran/trans-expr.c index 8f1bddc..479c807 100644 --- a/gcc/fortran/trans-expr.c +++ b/gcc/fortran/trans-expr.c @@ -463,12 +463,20 @@ gfc_conv_substring (gfc_se * se, gfc_ref * ref, int kind, gfc_free (msg); } - tmp = fold_build2_loc (input_location, MINUS_EXPR, gfc_charlen_type_node, - end.expr, start.expr); - tmp = fold_build2_loc (input_location, PLUS_EXPR, gfc_charlen_type_node, - build_int_cst (gfc_charlen_type_node, 1), tmp); - tmp = fold_build2_loc (input_location, MAX_EXPR, gfc_charlen_type_node, tmp, - build_int_cst (gfc_charlen_type_node, 0)); + /* If the start and end expressions are equal, the length is one. */ + if (ref->u.ss.end + && gfc_dep_compare_expr (ref->u.ss.start, ref->u.ss.end) == 0) + tmp = build_int_cst (gfc_charlen_type_node, 1); + else + { + tmp = fold_build2_loc (input_location, MINUS_EXPR, gfc_charlen_type_node, + end.expr, start.expr); + tmp = fold_build2_loc (input_location, PLUS_EXPR, gfc_charlen_type_node, + build_int_cst (gfc_charlen_type_node, 1), tmp); + tmp = fold_build2_loc (input_location, MAX_EXPR, gfc_charlen_type_node, + tmp, build_int_cst (gfc_charlen_type_node, 0)); + } + se->string_length = tmp; } |