return lang_hooks.types.signed_type (type);
}
-/* Return the LABEL_DECL associated with T, which must be a
- CASE_LABEL_EXPR. This will walk through any CASE_LABEL_EXPRs
- appearing in operand 2 until it finds a CASE_LABEL_EXPR with
- a LABEL_DECL in operand 2. */
+/* Returns the largest value obtainable by casting something in INNER type to
+ OUTER type. */
tree
-get_case_label (tree t)
+upper_bound_in_type (tree outer, tree inner)
{
- while (TREE_CODE (CASE_LEADER_OR_LABEL (t)) == CASE_LABEL_EXPR)
- t = CASE_LEADER_OR_LABEL (t);
- return CASE_LEADER_OR_LABEL (t);
+ unsigned HOST_WIDE_INT lo, hi;
+ unsigned bits = TYPE_PRECISION (inner);
+
+ if (TYPE_UNSIGNED (outer) || TYPE_UNSIGNED (inner))
+ {
+ /* Zero extending in these cases. */
+ if (bits <= HOST_BITS_PER_WIDE_INT)
+ {
+ hi = 0;
+ lo = (~(unsigned HOST_WIDE_INT) 0)
+ >> (HOST_BITS_PER_WIDE_INT - bits);
+ }
+ else
+ {
+ hi = (~(unsigned HOST_WIDE_INT) 0)
+ >> (2 * HOST_BITS_PER_WIDE_INT - bits);
+ lo = ~(unsigned HOST_WIDE_INT) 0;
+ }
+ }
+ else
+ {
+ /* Sign extending in these cases. */
+ if (bits <= HOST_BITS_PER_WIDE_INT)
+ {
+ hi = 0;
+ lo = (~(unsigned HOST_WIDE_INT) 0)
+ >> (HOST_BITS_PER_WIDE_INT - bits) >> 1;
+ }
+ else
+ {
+ hi = (~(unsigned HOST_WIDE_INT) 0)
+ >> (2 * HOST_BITS_PER_WIDE_INT - bits) >> 1;
+ lo = ~(unsigned HOST_WIDE_INT) 0;
+ }
+ }
+
+ return fold_convert (outer,
+ build_int_cst_wide (inner, lo, hi));
+}
+
+/* Returns the smallest value obtainable by casting something in INNER type to
+ OUTER type. */
+
+tree
+lower_bound_in_type (tree outer, tree inner)
+{
+ unsigned HOST_WIDE_INT lo, hi;
+ unsigned bits = TYPE_PRECISION (inner);
+
+ if (TYPE_UNSIGNED (outer) || TYPE_UNSIGNED (inner))
+ lo = hi = 0;
+ else if (bits <= HOST_BITS_PER_WIDE_INT)
+ {
+ hi = ~(unsigned HOST_WIDE_INT) 0;
+ lo = (~(unsigned HOST_WIDE_INT) 0) << (bits - 1);
+ }
+ else
+ {
+ hi = (~(unsigned HOST_WIDE_INT) 0) << (bits - HOST_BITS_PER_WIDE_INT - 1);
+ lo = 0;
+ }
+
+ return fold_convert (outer,
+ build_int_cst_wide (inner, lo, hi));
}
#include "gt-tree.h"