This sign-extends it, similar to how we treat TYPE_MAX_VALUE of
sizetype.
Bootstrapped and tested on x86_64-unknown-linux-gnu, applied to trunk.
Richard.
2011-08-01 Richard Guenther <rguent...@suse.de>
* stor-layout.c (initialize_sizetypes): Properly sign-extend
bitsiztype TYPE_MAX_VALUE.
Index: gcc/stor-layout.c
===================================================================
--- gcc/stor-layout.c (revision 176998)
+++ gcc/stor-layout.c (working copy)
@@ -2247,7 +2247,11 @@ initialize_sizetypes (void)
= size_int (GET_MODE_SIZE (TYPE_MODE (bitsizetype)));
set_min_and_max_values_for_integral_type (bitsizetype, bprecision,
/*is_unsigned=*/true);
- /* ??? TYPE_MAX_VALUE is not properly sign-extended. */
+ /* bitsizetype is unsigned but we need to fix TYPE_MAX_VALUE so that it is
+ sign-extended in a way consistent with force_fit_type. */
+ TYPE_MAX_VALUE (bitsizetype)
+ = double_int_to_tree (bitsizetype,
+ tree_to_double_int (TYPE_MAX_VALUE (bitsizetype)));
/* Create the signed variants of *sizetype. */
ssizetype = make_signed_type (TYPE_PRECISION (sizetype));
