genrecog.c (print_host_wide_int): New.

        * genrecog.c (print_host_wide_int): New.
        (write_switch, write_cond): Use it.

From-SVN: r74806

gcc/ChangeLog

 2003-12-18  Richard Henderson  <rth@redhat.com>
 
+	* genrecog.c (print_host_wide_int): New.
+	(write_switch, write_cond): Use it.
+
+2003-12-18  Richard Henderson  <rth@redhat.com>
+
 	* c-decl.c (check_bitfield_type_and_width): Remove enum special
 	case suppression of pedwarn.
 	* system.h (ENUM_BITFIELD): Use __extension__.

gcc/genrecog.c

@@ -1734,6 +1734,20 @@ write_afterward (struct decision *start, struct decision *afterward,
     }
 }
 
+/* Emit a HOST_WIDE_INT as an integer constant expression.  We need to take
+   special care to avoid "decimal constant is so large that it is unsigned"
+   warnings in the resulting code.  */
+
+static void
+print_host_wide_int (HOST_WIDE_INT val)
+{
+  HOST_WIDE_INT min = (unsigned HOST_WIDE_INT)1 << (HOST_BITS_PER_WIDE_INT-1);
+  if (val == min)
+    printf ("(" HOST_WIDE_INT_PRINT_DEC_C "-1)", val + 1);
+  else
+    printf (HOST_WIDE_INT_PRINT_DEC_C, val);
+}
+
 /* Emit a switch statement, if possible, for an initial sequence of
    nodes at START.  Return the first node yet untested.  */
 
@@ -1907,7 +1921,7 @@ write_switch (struct decision *start, int depth)
 	    case DT_elt_one_int:
 	    case DT_elt_zero_wide:
 	    case DT_elt_zero_wide_safe:
-	      printf (HOST_WIDE_INT_PRINT_DEC_C, p->tests->u.intval);
+	      print_host_wide_int (p->tests->u.intval);
 	      break;
 	    default:
 	      abort ();
@@ -1964,7 +1978,7 @@ write_cond (struct decision_test *p, int depth,
     case DT_elt_zero_wide:
     case DT_elt_zero_wide_safe:
       printf ("XWINT (x%d, 0) == ", depth);
-      printf (HOST_WIDE_INT_PRINT_DEC_C, p->u.intval);
+      print_host_wide_int (p->u.intval);
       break;
 
     case DT_veclen_ge: