fold-const.c (optimze_bit_field_compare): Initialize rnbitpos, rnbitsize, rnmode and rinner.

        * fold-const.c optimze_bit_field_compare): Initialize rnbitpos,
        rnbitsize, rnmode and rinner.
        (make_range): Initialize type.
        (fold): Initialize arg0, arg1 and varop.
        * function.c (instantiate_virtual_regs_1): Initialize offset, regnoi
        and regnor.
        (expand_function_start): Initialize last_ptr.
        * stor-layout.c (layout_record): Initialize desired_align.
        (get_best_mode): Initialize unit.
        * tree.c (copy_node): Initialize length.

From-SVN: r18943

gcc/ChangeLog

 Wed Apr  1 22:26:22 1998  Jeffrey A Law  (law@cygnus.com)
 
+	* fold-const.c optimze_bit_field_compare): Initialize rnbitpos,
+	rnbitsize, rnmode and rinner.
+	(make_range): Initialize type.
+	(fold): Initialize arg0, arg1 and varop.
+
+	* function.c (instantiate_virtual_regs_1): Initialize offset, regnoi
+	and regnor.
+	(expand_function_start): Initialize last_ptr.
+
+	* stor-layout.c (layout_record): Initialize desired_align.
+	(get_best_mode): Initialize unit.
+
+	* tree.c (copy_node): Initialize length.
+
 	* c-lex.c (yylex): Initialize traditional_type, ansi_type and type.
 
 	* caller-save.c (insert_save_restore): Initialize pat, code and

gcc/fold-const.c

@@ -2388,15 +2388,15 @@ optimize_bit_field_compare (code, compare_type, lhs, rhs)
      tree lhs, rhs;
 {
   int lbitpos, lbitsize, rbitpos, rbitsize;
-  int lnbitpos, lnbitsize, rnbitpos, rnbitsize;
+  int lnbitpos, lnbitsize, rnbitpos = 0, rnbitsize = 0;
   tree type = TREE_TYPE (lhs);
   tree signed_type, unsigned_type;
   int const_p = TREE_CODE (rhs) == INTEGER_CST;
-  enum machine_mode lmode, rmode, lnmode, rnmode;
+  enum machine_mode lmode, rmode, lnmode, rnmode = VOIDmode;
   int lunsignedp, runsignedp;
   int lvolatilep = 0, rvolatilep = 0;
   int alignment;
-  tree linner, rinner;
+  tree linner, rinner = NULL_TREE;
   tree mask;
   tree offset;
 
@@ -2784,7 +2784,7 @@ make_range (exp, pin_p, plow, phigh)
      tree *plow, *phigh;
 {
   enum tree_code code;
-  tree arg0, arg1, type;
+  tree arg0, arg1, type = NULL_TREE;
   int in_p, n_in_p;
   tree low, high, n_low, n_high;
 
@@ -3717,7 +3717,7 @@ fold (expr)
   tree t1 = NULL_TREE;
   tree tem;
   tree type = TREE_TYPE (expr);
-  register tree arg0, arg1;
+  register tree arg0 = NULL_TREE, arg1 = NULL_TREE;
   register enum tree_code code = TREE_CODE (t);
   register int kind;
   int invert;
@@ -5114,7 +5114,7 @@ fold (expr)
 	 First, see if one arg is constant; find the constant arg
 	 and the other one.  */
       {
-	tree constop = 0, varop;
+	tree constop = 0, varop = NULL_TREE;
 	int constopnum = -1;
 
 	if (TREE_CONSTANT (arg1))

gcc/function.c

@@ -2977,7 +2977,7 @@ instantiate_virtual_regs_1 (loc, object, extra_insns)
   rtx x;
   RTX_CODE code;
   rtx new = 0;
-  int offset;
+  int offset = 0;
   rtx temp;
   rtx seq;
   int i, j;
@@ -4037,7 +4037,7 @@ assign_parms (fndecl, second_time)
 	     may need to do it in a wider mode.  */
 
 	  register rtx parmreg;
-	  int regno, regnoi, regnor;
+	  int regno, regnoi = 0, regnor = 0;
 
 	  unsignedp = TREE_UNSIGNED (TREE_TYPE (parm));
 
@@ -5336,7 +5336,7 @@ expand_function_start (subr, parms_have_cleanups)
 {
   register int i;
   tree tem;
-  rtx last_ptr;
+  rtx last_ptr = NULL_RTX;
 
   /* Make sure volatile mem refs aren't considered
      valid operands of arithmetic insns.  */

gcc/stor-layout.c

@@ -331,7 +331,7 @@ layout_record (rec)
   for (field = TYPE_FIELDS (rec); field; field = TREE_CHAIN (field))
     {
       register int known_align = var_size ? var_align : const_size;
-      register int desired_align;
+      register int desired_align = 0;
 
       /* If FIELD is static, then treat it like a separate variable,
 	 not really like a structure field.
@@ -1222,7 +1222,7 @@ get_best_mode (bitsize, bitpos, align, largest_mode, volatilep)
      int volatilep;
 {
   enum machine_mode mode;
-  int unit;
+  int unit = 0;
 
   /* Find the narrowest integer mode that contains the bit field.  */
   for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode;

gcc/tree.c

@@ -1128,7 +1128,7 @@ copy_node (node)
 {
   register tree t;
   register enum tree_code code = TREE_CODE (node);
-  register int length;
+  register int length = 0;
   register int i;
 
   switch (TREE_CODE_CLASS (code))