From f1c715c4559f9033352e51d3b75358463ac9c864 Mon Sep 17 00:00:00 2001
From: acqn <acqn163@outlook.com>
Date: Sun, 7 Feb 2021 11:35:36 +0800
Subject: [PATCH] Fixed a bug that pointer subtraction results from two
 absolute addresses are calculated as unsigned long.

---
 src/cc65/expr.c    | 2 +-
 test/val/bug1310.c | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/cc65/expr.c b/src/cc65/expr.c
index 4f8a09bec..30eda8707 100644
--- a/src/cc65/expr.c
+++ b/src/cc65/expr.c
@@ -3353,7 +3353,7 @@ static void parsesub (ExprDesc* Expr)
                     Error ("Incompatible pointer types");
                 } else {
                     Expr->IVal = (Expr->IVal - Expr2.IVal) /
-                                      CheckedPSizeOf (lhst);
+                                      (long)CheckedPSizeOf (lhst);
                 }
                 /* Operate on pointers, result type is an integer */
                 Expr->Type = type_int;
diff --git a/test/val/bug1310.c b/test/val/bug1310.c
index dc9e47b5c..306c91fb6 100644
--- a/test/val/bug1310.c
+++ b/test/val/bug1310.c
@@ -76,6 +76,12 @@ int main (void)
         fprintf (stderr, "Expected ~32767U == 32768U, got: %ld\n", (long)~32767U);
         failures++;
     }
+
+    if ((long*)0x1000 - (long*)0x2000 >= 0) {
+        fprintf (stderr, "Expected (long*)0x1000 - (long*)0x2000 < 0, got: %ld\n", (long*)0x1000 - (long*)0x2000);
+        failures++;
+    }
     printf ("failures: %u\n", failures);
+
     return failures;
 }