optabs.c (expand_binop): Fix nwords sign warnings.

        * optabs.c (expand_binop): Fix nwords sign warnings.
        generate pseudo for add_optab.

Co-Authored-By: Jeff Law <law@redhat.com>

From-SVN: r53976

gcc/ChangeLog

@@ -78,6 +78,9 @@ Tue May 28 21:16:18 2002  J"orn Rennecke <joern.rennecke@superh.com>
 2002-05-22  David Edelsohn  <edelsohn@gnu.org>
 	    Jeff Law <law@redhat.com>
 
+	* optabs.c (expand_binop): Fix nwords sign warnings.
+	generate pseudo for add_optab.
+
 	* sched-deps.c (sched_analyze): Do not clear SCHED_GROUP_P.
 	* haifa-sched.c (move_insn): Clear SCHED_GROUP_P after it is used.
 

gcc/optabs.c

@@ -1210,9 +1210,9 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods)
     {
       int i;
       optab otheroptab = binoptab == add_optab ? sub_optab : add_optab;
-      unsigned int nwords = GET_MODE_BITSIZE (mode) / BITS_PER_WORD;
+      int nwords = GET_MODE_BITSIZE (mode) / BITS_PER_WORD;
       rtx carry_in = NULL_RTX, carry_out = NULL_RTX;
-      rtx xop0, xop1;
+      rtx xop0, xop1, xtarget;
 
       /* We can handle either a 1 or -1 value for the carry.  If STORE_FLAG
 	 value is one of those, use it.  Otherwise, use 1 since it is the
@@ -1227,19 +1227,20 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods)
       xop0 = force_reg (mode, op0);
       xop1 = force_reg (mode, op1);
 
-      if (target == 0 || GET_CODE (target) != REG
-	  || target == xop0 || target == xop1)
-	target = gen_reg_rtx (mode);
+      xtarget = gen_reg_rtx (mode);
+
+      if (target == 0 || GET_CODE (target) != REG)
+	target = xtarget;
 
       /* Indicate for flow that the entire target reg is being set.  */
       if (GET_CODE (target) == REG)
-	emit_insn (gen_rtx_CLOBBER (VOIDmode, target));
+	emit_insn (gen_rtx_CLOBBER (VOIDmode, xtarget));
 
       /* Do the actual arithmetic.  */
       for (i = 0; i < nwords; i++)
 	{
 	  int index = (WORDS_BIG_ENDIAN ? nwords - i - 1 : i);
-	  rtx target_piece = operand_subword (target, index, 1, mode);
+	  rtx target_piece = operand_subword (xtarget, index, 1, mode);
 	  rtx op0_piece = operand_subword_force (xop0, index, mode);
 	  rtx op1_piece = operand_subword_force (xop1, index, mode);
 	  rtx x;
@@ -1299,7 +1300,7 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods)
 	{
 	  if (mov_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing)
 	    {
-	      rtx temp = emit_move_insn (target, target);
+	      rtx temp = emit_move_insn (target, xtarget);
 
 	      set_unique_reg_note (temp,
 	      			   REG_EQUAL,