re PR middle-end/27724 (internal compiler error: no-op convert from 4 to 8 bytes in initializer)

        PR middle-end/27724
        * varasm.c (output_constant): Only strip actual no-op conversions.

From-SVN: r116777

gcc/ChangeLog

 2006-09-07  Jason Merrill  <jason@redhat.com>
 
+	PR middle-end/27724
+	* varasm.c (output_constant): Only strip actual no-op conversions.
+
 	PR target/13685
 	* config/i386/i386.c (override_options): Use 128-bit
 	stack boundary if -msse.

gcc/testsuite/gcc.dg/long-long-cst1.c

+/* PR middle-end/27724 */
+/* { dg-do run } */
+/* { dg-options "" } */
+
+extern void abort();
+
+struct st{
+  int _mark;
+};
+unsigned long long t = ((int)&(((struct st*)16)->_mark) - 32);
+
+int main()
+{
+  if (t != (unsigned long long)(int)-16)
+    abort ();
+}
+

gcc/varasm.c

@@ -4039,10 +4039,10 @@ output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
       if (type_size > op_size
 	  && TREE_CODE (exp) != VIEW_CONVERT_EXPR
 	  && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
-	internal_error ("no-op convert from %wd to %wd bytes in initializer",
-			op_size, type_size);
-
-      exp = TREE_OPERAND (exp, 0);
+	/* Keep the conversion. */
+	break;
+      else
+	exp = TREE_OPERAND (exp, 0);
     }
 
   code = TREE_CODE (TREE_TYPE (exp));