3 files changed, 18 insertions, 0 deletions
diff --git a/tvix/eval/src/builtins/mod.rs b/tvix/eval/src/builtins/mod.rs
index 009758fe0f33..ebbc5e336c21 100644
--- a/tvix/eval/src/builtins/mod.rs
+++ b/tvix/eval/src/builtins/mod.rs
@@ -108,6 +108,13 @@ fn pure_builtins() -> Vec<Builtin> {
                 })
             })
         }),
+        Builtin::new("bitOr", 2, |args, vm| {
+            force!(vm, &args[0], x, {
+                force!(vm, &args[1], y, {
+                    Ok(Value::Integer(x.as_int()? | y.as_int()?))
+                })
+            })
+        }),
         Builtin::new("catAttrs", 2, |mut args, _| {
             let list = args.pop().unwrap().to_list()?;
             let key = args.pop().unwrap().to_str()?;
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-bitor.exp b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-bitor.exp
new file mode 100644
index 000000000000..2556b4183c77
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-bitor.exp
@@ -0,0 +1 @@
+[ 0 1 1 1 8 8 8 8 ]
diff --git a/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-bitor.nix b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-bitor.nix
new file mode 100644
index 000000000000..9c28f6d7acee
--- /dev/null
+++ b/tvix/eval/src/tests/tvix_tests/eval-okay-builtins-bitor.nix
@@ -0,0 +1,10 @@
+[
+  (builtins.bitOr 0 0)
+  (builtins.bitOr 1 0)
+  (builtins.bitOr 0 1)
+  (builtins.bitOr 1 1)
+  (builtins.bitOr 8 8)
+  (builtins.bitOr 8 (builtins.add 4 4))
+  (builtins.bitOr (builtins.add 4 4) 8)
+  (builtins.bitOr (builtins.add 4 4) (builtins.add 4 4))
+]