From b58b07189521e82c7a8e8bc43fc3c271f89832fd Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Fri, 27 Mar 2026 19:47:27 +0100
Subject: FFI: Fix pointer difference operation on 64 bit platforms.

Thanks to cuiweixie. #1449
---
 src/lj_carith.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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));
-- 
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