From ffe6400ed1fffcac3dc114a38675b523efb0c916 Mon Sep 17 00:00:00 2001
From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Tue, 26 Oct 2021 18:11:06 +0200
Subject: [PATCH] core/intcode: fix unsigned to signed conversion function

---
 nihav-core/src/io/intcode.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nihav-core/src/io/intcode.rs b/nihav-core/src/io/intcode.rs
index 55c8f85..f5d1282 100644
--- a/nihav-core/src/io/intcode.rs
+++ b/nihav-core/src/io/intcode.rs
@@ -142,7 +142,7 @@ fn read_gammap(br: &mut BitReader) -> BitReaderResult<u32> {
 }
 
 fn uval_to_sval0mp(uval: u32) -> i32 {
-    if (uval & 1) != 0 { -((uval >> 1) as i32) }
+    if (uval & 1) != 0 { -(((uval + 1) >> 1) as i32) }
     else               { (uval >> 1) as i32 }
 }
 
-- 
2.30.2