Patch from Bill Moyer.

        * loop.c (basic_induction_var): Added test preventing
        CCmode parameter passed to convert_modes().

From-SVN: r19779

gcc/ChangeLog

+Fri May 15 17:36:11 1998  Bill Moyer <ttk@cygnus.com>
+
+        * loop.c (basic_induction_var): Added test preventing
+        CCmode parameter passed to convert_modes().
+
 Fri May 15 17:26:18 1998  Alexandre Petit-Bianco  <apbianco@cygnus.com>
 
 	* expr.c (expand_expr, case EXPR_WITH_FILE_LOCATION): Save/restore

gcc/loop.c

@@ -5257,7 +5257,12 @@ basic_induction_var (x, mode, dest_reg, p, inc_val, mult_val)
     case CONST_INT:
     case SYMBOL_REF:
     case CONST:
-      if (loops_enclosed == 1)
+      /* convert_modes aborts if we try to convert to or from CCmode, so just
+         exclude that case.  It is very unlikely that a condition code value
+	 would be a useful iterator anyways.  */
+      if (loops_enclosed == 1
+	  && GET_MODE_CLASS (mode) != MODE_CC
+	  && GET_MODE_CLASS (GET_MODE (dest_reg)) != MODE_CC)
  	{
 	  /* Possible bug here?  Perhaps we don't know the mode of X.  */
 	  *inc_val = convert_modes (GET_MODE (dest_reg), mode, x, 0);