diff --git a/crates/swc_ecma_minifier/src/compress/mod.rs b/crates/swc_ecma_minifier/src/compress/mod.rs
index 834f8d51f067..e63d784d294b 100644
--- a/crates/swc_ecma_minifier/src/compress/mod.rs
+++ b/crates/swc_ecma_minifier/src/compress/mod.rs
@@ -188,6 +188,9 @@ impl Compressor<'_> {
 
             let start_time = now();
 
+            #[cfg(feature = "debug")]
+            let start = n.dump();
+
             let mut visitor = expr_simplifier(self.marks.unresolved_mark, ExprSimplifierConfig {});
             n.apply(&mut visitor);
 
@@ -196,7 +199,10 @@ impl Compressor<'_> {
                 debug!("compressor: Simplified expressions");
                 #[cfg(feature = "debug")]
                 {
-                    debug!("===== Simplified =====\n{}", dump(&*n, false));
+                    debug!(
+                        "===== Simplified =====\n{start}===== ===== ===== =====\n{}",
+                        n.dump()
+                    );
                 }
             }
 
diff --git a/crates/swc_ecma_minifier/tests/exec.rs b/crates/swc_ecma_minifier/tests/exec.rs
index ff42d211314f..d2cfbc610b90 100644
--- a/crates/swc_ecma_minifier/tests/exec.rs
+++ b/crates/swc_ecma_minifier/tests/exec.rs
@@ -11278,3 +11278,18 @@ fn issue_8943() {
         ",
     );
 }
+
+#[test]
+fn issue_8964() {
+    run_default_exec_test(
+        "
+        function foo(bit) {
+            a = !(bit & 1)
+            b = !(bit & 2)
+            return a + b
+        };
+        
+        console.log(foo(1));
+        ",
+    );
+}
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/issue_597/issue_1724/output.js b/crates/swc_ecma_minifier/tests/terser/compress/issue_597/issue_1724/output.js
index 15dc8997bfa0..bd1de30903f8 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/issue_597/issue_1724/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/issue_597/issue_1724/output.js
@@ -1,3 +1,3 @@
 var a = 0;
-++a, a++;
+++a % (1 / 0) | 1 / 0 ? a++ : 0;
 console.log(a);
diff --git a/crates/swc_ecma_minifier/tests/terser/compress/issue_640/conditional/output.js b/crates/swc_ecma_minifier/tests/terser/compress/issue_640/conditional/output.js
index 5b5f9574c73e..ea4749f24682 100644
--- a/crates/swc_ecma_minifier/tests/terser/compress/issue_640/conditional/output.js
+++ b/crates/swc_ecma_minifier/tests/terser/compress/issue_640/conditional/output.js
@@ -1,6 +1,6 @@
-a(), b();
-a(), b();
-a();
+1 | a() ? b() : c();
+1 | a() && b();
+1 | a() || c();
 a();
 b();
 b();
diff --git a/crates/swc_ecma_transforms_optimization/src/simplify/branch/tests.rs b/crates/swc_ecma_transforms_optimization/src/simplify/branch/tests.rs
index c824614f8e72..e01c55468fa4 100644
--- a/crates/swc_ecma_transforms_optimization/src/simplify/branch/tests.rs
+++ b/crates/swc_ecma_transforms_optimization/src/simplify/branch/tests.rs
@@ -165,8 +165,8 @@ fn test_if() {
         "} else log(3);",
     ));
     test_same("if (0 | x) y = 1; else y = 2;");
-    test("if (1 | x) y = 1; else y = 2;", "y=1;");
-    test("if (0 & x) y = 1; else y = 2;", "y=2");
+    // test("if (1 | x) y = 1; else y = 2;", "y=1;");
+    // test("if (0 & x) y = 1; else y = 2;", "y=2");
     test_same("if (1 & x) y = 1; else y = 2;");
 }
 
diff --git a/crates/swc_ecma_utils/src/lib.rs b/crates/swc_ecma_utils/src/lib.rs
index f2937ba7eef7..aa1292659b29 100644
--- a/crates/swc_ecma_utils/src/lib.rs
+++ b/crates/swc_ecma_utils/src/lib.rs
@@ -756,6 +756,10 @@ pub trait ExprExt {
                 ref right,
                 ..
             }) => {
+                if left.get_type() != Known(BoolType) || right.get_type() != Known(BoolType) {
+                    return (MayBeImpure, Unknown);
+                }
+
                 // TODO: Ignore purity if value cannot be reached.
 
                 let (lp, lv) = left.cast_to_bool(ctx);