Properly handle pointer addition/subtraction in num_sign_bit_copies1.

From-SVN: r175383

gcc/ChangeLog

@@ -2,7 +2,8 @@
 
 	PR rtl-optimization/49504
 	* rtlanal.c (nonzero_bits1): Properly handle addition or
-	subtraction a pointer in Pmode if pointers extend unsigned.
+	subtraction of a pointer in Pmode if pointers extend unsigned.
+	(num_sign_bit_copies1): Likewise.
 
 2011-06-24  Martin Jambor  <mjambor@suse.cz>
 

gcc/rtlanal.c

@@ -4605,21 +4605,6 @@ num_sign_bit_copies1 (const_rtx x, enum machine_mode mode, const_rtx known_x,
 					 known_x, known_mode, known_ret);
       result = MAX (1, MIN (num0, num1) - 1);
 
-#ifdef POINTERS_EXTEND_UNSIGNED
-      /* If pointers extend signed and this is an addition or subtraction
-	 to a pointer in Pmode, all the bits above ptr_mode are known to be
-	 sign bit copies.  */
-      /* As we do not know which address space the pointer is refering to,
-	 we can do this only if the target does not support different pointer
-	 or address modes depending on the address space.  */
-      if (target_default_pointer_address_modes_p ()
-	  && ! POINTERS_EXTEND_UNSIGNED && GET_MODE (x) == Pmode
-	  && (code == PLUS || code == MINUS)
-	  && REG_P (XEXP (x, 0)) && REG_POINTER (XEXP (x, 0)))
-	result = MAX ((int) (GET_MODE_BITSIZE (Pmode)
-			     - GET_MODE_BITSIZE (ptr_mode) + 1),
-		      result);
-#endif
       return result;
 
     case MULT: