FFI: Fix pointer difference operation on 64 bit platforms.

Thanks to cuiweixie. #1449

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lj_carith.c b/src/lj_carith.c
index 418400cf..e3287de9 100644
--- a/src/lj_carith.c
+++ b/src/lj_carith.c
@@ -118,7 +118,7 @@ static int carith_ptr(lua_State *L, CTState *cts, CDArith *ca, MMS mm)
         /* All valid pointer differences on x64 are in (-2^47, +2^47),
         ** which fits into a double without loss of precision.
         */
-        setintptrV(L->top-1, (int32_t)diff);
+        setintptrV(L->top-1, diff);
         return 1;
       } else if (mm == MM_lt) {  /* Pointer comparison (unsigned). */
         setboolV(L->top-1, ((uintptr_t)pp < (uintptr_t)pp2));