From 5ad52cc1ed0f1fbc9781cfac8f59d202ff58738c Mon Sep 17 00:00:00 2001
From: Aleksi Hannula <ahannula4+nixgit@gmail.com>
Date: Thu, 5 Feb 2026 09:31:11 +0200
Subject: [PATCH] Cast signed pointer offset to ptrdiff_t before performing
 arithmetic

Affects 32-bit platforms.
---
 tccgen.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tccgen.c b/tccgen.c
index 0ea6c288..50802edf 100644
--- a/tccgen.c
+++ b/tccgen.c
@@ -3097,6 +3097,9 @@ op_err:
 #endif
             type1 = vtop[-1].type;
             vpush_type_size(pointed_type(&vtop[-1].type), &align);
+            if (!(vtop[-1].type.t & VT_UNSIGNED)) {
+                gen_cast_s(VT_PTRDIFF_T);
+            }
             gen_op('*');
 #ifdef CONFIG_TCC_BCHECK
             if (tcc_state->do_bounds_check && !CONST_WANTED) {