sp_alignment = MIN (PUSH_ROUNDING (1), sp_alignment);
#endif
- return nonzero & ~ (sp_alignment - 1);
+ nonzero &= ~ (sp_alignment - 1);
}
#endif
+#ifdef POINTERS_EXTEND_UNSIGNED
+ /* If pointers extend unsigned and this is a pointer in Pmode, say that
+ all the bits above ptr_mode are known to be zero. */
+ if (POINTERS_EXTEND_UNSIGNED && GET_MODE (x) == Pmode
+ && REGNO_POINTER_FLAG (REGNO (x)))
+ nonzero &= GET_MODE_MASK (ptr_mode);
+#endif
+
/* If X is a register whose nonzero bits value is current, use it.
Otherwise, if X is a register whose value we can find, use that
value. Otherwise, use the previously-computed global nonzero bits
{
case REG:
+#ifdef POINTERS_EXTEND_UNSIGNED
+ /* If pointers extend signed and this is a pointer in Pmode, say that
+ all the bits above ptr_mode are known to be sign bit copies. */
+ if (! POINTERS_EXTEND_UNSIGNED && GET_MODE (x) == Pmode && mode == Pmode
+ && REGNO_POINTER_FLAG (REGNO (x)))
+ return GET_MODE_BITSIZE (Pmode) - GET_MODE_BITSIZE (ptr_mode) + 1;
+#endif
+
if (reg_last_set_value[REGNO (x)] != 0
&& reg_last_set_mode[REGNO (x)] == mode
&& (reg_n_sets[REGNO (x)] == 1