stor-layout.c (layout_type): Do not change TYPE_PRECISION or TYPE_UNSIGNED of integral types.

2013-10-18  Richard Biener  <rguenther@suse.de>

	* stor-layout.c (layout_type): Do not change TYPE_PRECISION
	or TYPE_UNSIGNED of integral types.
	(set_min_and_max_values_for_integral_type): Leave TYPE_MIN/MAX_VALUE
	NULL_TREE for zero-precision integral types.

From-SVN: r203813

gcc/ChangeLog

+2013-10-18  Richard Biener  <rguenther@suse.de>
+
+	* stor-layout.c (layout_type): Do not change TYPE_PRECISION
+	or TYPE_UNSIGNED of integral types.
+	(set_min_and_max_values_for_integral_type): Leave TYPE_MIN/MAX_VALUE
+	NULL_TREE for zero-precision integral types.
+
 2013-10-18  James Greenhalgh  <james.greenhalgh@arm.com>
 
 	* config/aarch64/arm_neon.h

gcc/stor-layout.c

@@ -2052,18 +2052,9 @@ layout_type (tree type)
 	 of the language-specific code.  */
       gcc_unreachable ();
 
-    case BOOLEAN_TYPE:  /* Used for Java, Pascal, and Chill.  */
-      if (TYPE_PRECISION (type) == 0)
-	TYPE_PRECISION (type) = 1; /* default to one byte/boolean.  */
-
-      /* ... fall through ...  */
-
+    case BOOLEAN_TYPE:
     case INTEGER_TYPE:
     case ENUMERAL_TYPE:
-      if (TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST
-	  && tree_int_cst_sgn (TYPE_MIN_VALUE (type)) >= 0)
-	TYPE_UNSIGNED (type) = 1;
-
       SET_TYPE_MODE (type,
 		     smallest_mode_for_size (TYPE_PRECISION (type), MODE_INT));
       TYPE_SIZE (type) = bitsize_int (GET_MODE_BITSIZE (TYPE_MODE (type)));
@@ -2520,6 +2511,12 @@ set_min_and_max_values_for_integral_type (tree type,
   tree min_value;
   tree max_value;
 
+  /* For bitfields with zero width we end up creating integer types
+     with zero precision.  Don't assign any minimum/maximum values
+     to those types, they don't have any valid value.  */
+  if (precision < 1)
+    return;
+
   if (is_unsigned)
     {
       min_value = build_int_cst (type, 0);