Take out find_base_value change -- not needed, only the find_base_term

change was needed.

From-SVN: r16185

gcc/ChangeLog

@@ -17,9 +17,8 @@ Sun Oct 26 09:21:40 1997  Jeffrey A Law  (law@cygnus.com)
 
 	* Makefile.in (LIBGCC2_CFLAGS): Add -fexceptions.
 
-	* alias.c (find_base_value): Handle PRE_INC, PRE_DEC, POST_INC,
+	* alias.c (find_base_term): Handle PRE_INC, PRE_DEC, POST_INC,
 	and POS_DEC.
-	(find_base_term): Likewise.
 
 	* alias.c (true_dependence): Fix typo.
 

gcc/alias.c

@@ -93,13 +93,6 @@ find_base_value (src)
     case LABEL_REF:
       return src;
 
-    case PRE_INC:
-    case PRE_DEC:
-    case POST_INC:
-    case POST_DEC:
-      src = XEXP (src, 0);
-      /* fall through */
-
     case REG:
       /* At the start of a function argument registers have known base
 	 values which may be lost later.  Returning an ADDRESS
@@ -107,6 +100,8 @@ find_base_value (src)
 	 even when the argument registers are used for other purposes.  */
       if (REGNO (src) < FIRST_PSEUDO_REGISTER && copying_arguments)
 	return reg_base_value[REGNO (src)];
+      if (REG_N_SETS (REGNO (src)) == 1 && reg_base_value[REGNO (src)])
+	return reg_base_value[REGNO (src)];
       return src;
 
     case MEM:
@@ -129,7 +124,21 @@ find_base_value (src)
     case PLUS:
     case MINUS:
       {
-	rtx src_0 = XEXP (src, 0), src_1 = XEXP (src, 1);
+	rtx temp, src_0 = XEXP (src, 0), src_1 = XEXP (src, 1);
+
+	if (GET_CODE (src_0) == REG)
+	  {
+	    temp = find_base_value (src_0);
+	    if (temp)
+	      src_0 = temp;
+	  }
+
+	if (GET_CODE (src_1) == REG)
+	  {
+	    temp = find_base_value (src_1);
+	    if (temp)
+	      src_1 = temp;
+	  }
 
 	/* Guess which operand is the base address.
 
@@ -144,6 +153,12 @@ find_base_value (src)
 	    || GET_CODE (src_0) == CONST)
 	  return find_base_value (src_0);
 
+	if (GET_CODE (src_0) == CONST_INT
+	    || GET_CODE (src_1) == SYMBOL_REF
+	    || GET_CODE (src_1) == LABEL_REF
+	    || GET_CODE (src_1) == CONST)
+	  return find_base_value (src_1);
+
 	if (GET_CODE (src_0) == REG && REGNO_POINTER_FLAG (REGNO (src_0)))
 	  return find_base_value (src_0);