+/* Gets minimal and maximal values for MODE (signed or unsigned depending on
+ SIGN). The returned constants are made to be usable in TARGET_MODE. */
+
+void
+get_mode_bounds (enum machine_mode mode, int sign,
+ enum machine_mode target_mode,
+ rtx *mmin, rtx *mmax)
+{
+ unsigned size = GET_MODE_BITSIZE (mode);
+ unsigned HOST_WIDE_INT min_val, max_val;
+
+ if (size > HOST_BITS_PER_WIDE_INT)
+ abort ();
+
+ if (sign)
+ {
+ min_val = -((unsigned HOST_WIDE_INT) 1 << (size - 1));
+ max_val = ((unsigned HOST_WIDE_INT) 1 << (size - 1)) - 1;
+ }
+ else
+ {
+ min_val = 0;
+ max_val = ((unsigned HOST_WIDE_INT) 1 << (size - 1) << 1) - 1;
+ }
+
+ *mmin = GEN_INT (trunc_int_for_mode (min_val, target_mode));
+ *mmax = GEN_INT (trunc_int_for_mode (max_val, target_mode));
+}
+