2 files changed, 21 insertions, 0 deletions
diff --git a/test/ruby/test_zjit.rb b/test/ruby/test_zjit.rb
index 9ee1cde35d..b158052ad4 100644
--- a/test/ruby/test_zjit.rb
+++ b/test/ruby/test_zjit.rb
@@ -233,6 +233,13 @@ class TestZJIT < Test::Unit::TestCase
     RUBY
   end
 
+  def test_opt_not
+    assert_compiles('[true, true, false]', <<~RUBY, insns: [:opt_not])
+      def test(obj) = !obj
+      return test(nil), test(false), test(0)
+    RUBY
+  end
+
   def test_opt_ge
     assert_compiles '[false, true, true]', %q{
       def test(a, b) = a >= b
diff --git a/zjit/src/hir.rs b/zjit/src/hir.rs
index d6d7cd7a12..f988b629d9 100644
--- a/zjit/src/hir.rs
+++ b/zjit/src/hir.rs
@@ -2379,6 +2379,7 @@ pub fn iseq_to_hir(iseq: *const rb_iseq_t) -> Result<Function, ParseError> {
                 YARVINSN_opt_succ |
                 YARVINSN_opt_and |
                 YARVINSN_opt_or |
+                YARVINSN_opt_not |
                 YARVINSN_opt_send_without_block => {
                     let cd: *const rb_call_data = get_arg(pc, 0).as_ptr();
                     let call_info = unsafe { rb_get_call_data_ci(cd) };
@@ -3865,6 +3866,19 @@ mod tests {
               Return v5
         "#]]);
     }
+
+    #[test]
+    fn opt_not() {
+        eval("
+            def test(x) = !x
+        ");
+        assert_method_hir_with_opcode("test", YARVINSN_opt_not, expect![[r#"
+            fn test:
+            bb0(v0:BasicObject, v1:BasicObject):
+              v4:BasicObject = SendWithoutBlock v1, :!
+              Return v4
+        "#]]);
+    }
     #[test]
     fn test_branchnil() {
         eval("