re PR c/25183 (internal compiler error triggered by overflow in constant expression)

2006-01-03  Richard Guenther  <rguenther@suse.de>

        PR c/25183
	* stmt.c (add_case_node): Make sure to clear overflow flags
	from ranges.

	* gcc.dg/torture/pr25183.c: New testcase.

From-SVN: r109272

gcc/ChangeLog

+2006-01-03  Richard Guenther  <rguenther@suse.de>
+
+	PR c/25183
+	* stmt.c (add_case_node): Make sure to clear overflow flags
+	from ranges.
+
 2006-01-03  Jakub Jelinek  <jakub@redhat.com>
 
 	Merge from gomp-branch.

gcc/stmt.c

@@ -2104,10 +2104,12 @@ add_case_node (struct case_node *head, tree type, tree low, tree high,
     }
 
 
-  /* Add this label to the chain.  */
+  /* Add this label to the chain.  Make sure to drop overflow flags.  */
   r = ggc_alloc (sizeof (struct case_node));
-  r->low = low;
-  r->high = high;
+  r->low = build_int_cst_wide (TREE_TYPE (low), TREE_INT_CST_LOW (low),
+			       TREE_INT_CST_HIGH (low));
+  r->high = build_int_cst_wide (TREE_TYPE (high), TREE_INT_CST_LOW (high),
+				TREE_INT_CST_HIGH (high));
   r->code_label = label;
   r->parent = r->left = NULL;
   r->right = head;

gcc/testsuite/ChangeLog

+2006-01-03  Richard Guenther  <rguenther@suse.de>
+
+	PR c/25183
+	* gcc.dg/torture/pr25183.c: New testcase.
+
 2006-01-03  Jakub Jelinek  <jakub@redhat.com>
 
 	Merge from gomp-branch.

gcc/testsuite/gcc.dg/torture/pr25183.c

+/* { dg-do compile } */
+/* { dg-options "-pedantic" } */
+
+enum err {
+  err_IO = 0x8a450000, /* { dg-warning "int" } */
+  err_NM,
+  err_EOF,
+  err_SE,
+  err_PT
+};
+static enum err E_;
+int error()
+{
+  switch (E_) {
+    case err_IO : break;  /* { dg-warning "overflow" } */
+    case err_NM : break;  /* { dg-warning "overflow" } */
+    case err_EOF : break; /* { dg-warning "overflow" } */
+    case err_SE : break;  /* { dg-warning "overflow" } */
+    case err_PT : break;  /* { dg-warning "overflow" } */
+    default : return 0;
+  }
+}