gcc/ChangeLog:

    * cselib.h (rtx_equal_for_cselib_1):
    Change return type from int to bool.
    (references_value_p): Ditto.
    (rtx_equal_for_cselib_p): Ditto.
    * expr.h (can_store_by_pieces): Ditto.
    (try_casesi): Ditto.
    (try_tablejump): Ditto.
    (safe_from_p): Ditto.
    * sbitmap.h (bitmap_equal_p): Ditto.
    * cselib.cc (references_value_p): Change return type
    from int to void and adjust function body accordingly.
    (rtx_equal_for_cselib_1): Ditto.
    * expr.cc (is_aligning_offset): Ditto.
    (can_store_by_pieces): Ditto.
    (mostly_zeros_p): Ditto.
    (all_zeros_p): Ditto.
    (safe_from_p): Ditto.
    (is_aligning_offset): Ditto.
    (try_casesi): Ditto.
    (try_tablejump): Ditto.
    (store_constructor): Change "need_to_clear" and
    "const_bounds_p" variables to bool.
    * sbitmap.cc (bitmap_equal_p):     Change return type from int to bool.

Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

Uros,