From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Tue, 26 Oct 2021 16:11:06 +0000 (+0200)
Subject: core/intcode: fix unsigned to signed conversion function
X-Git-Url: https://git.nihav.org/?a=commitdiff_plain;h=ffe6400ed1fffcac3dc114a38675b523efb0c916;p=nihav.git

core/intcode: fix unsigned to signed conversion function
---

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 }
 }