More emacs-module.c fixes for wide ints

* src/emacs-module.c (value_to_lisp) [WIDE_EMACS_INT]: Use
unsigned data types to manipulate pointers, to avoid sign
extension coming after us with a vengeance.

* modules/mod-test/test.el (mod-test-sum-test): Add tests for
Emacs with wide ints that verify integer values near the critical
value that requires us to switch to a cons cell.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/emacs-module.c b/src/emacs-module.c
index 13f2a1dd98f..22fee7e4860 100644
--- a/src/emacs-module.c
+++ b/src/emacs-module.c
@@ -850,8 +850,8 @@ static Lisp_Object
 value_to_lisp (emacs_value v)
 {
 #ifdef WIDE_EMACS_INT
-  ptrdiff_t tmp = (ptrdiff_t)v;
-  int tag = tmp & ((1 << GCTYPEBITS) - 1);
+  uintptr_t tmp = (uintptr_t)v;
+  unsigned tag = tmp & ((1 << GCTYPEBITS) - 1);
   Lisp_Object o;
   switch (tag)
     {