[clang-tools-extra] [clang-tidy] Add performance-bool-bitwise-operation check (PR #142324)

Baranov Victor via cfe-commits cfe-commits at lists.llvm.org
Mon Jun 2 05:08:39 PDT 2025


================
@@ -0,0 +1,40 @@
+.. title:: clang-tidy - performance-bool-bitwise-operation
+
+performance-bool-bitwise-operation
+==================================
+
+Finds potentially inefficient use of bitwise operators such as ``&``, 
+``|`` and their compound analogues on boolean values where logical 
+operators like ``&&`` and ``||`` would be more appropriate. Bitwise 
+operations on booleans can incur unnecessary performance overhead 
+due to implicit integer conversions and missed short-circuit evaluation.
+
+.. code-block:: c++
+
+  bool invalid = false;
+  invalid |= x > limit.x; // warning: use logical operator instead of bitwise one for bool
+  invalid |= y > limit.y; // warning: use logical operator instead of bitwise one for bool
+  invalid |= z > limit.z; // warning: use logical operator instead of bitwise one for bool
+  if (invalid) {
+    // error handling
+  }
+
+These 3 warnings suggest to assign result of logical ``||`` operation instead of using ``|=`` operator:
+
+.. code-block:: c++
+
+  bool invalid = false;
+  invalid = invalid || x > limit.x;
+  invalid = invalid || y > limit.x;
+  invalid = invalid || z > limit.z;
+  if (invalid) {
+    // error handling
+  }
+
+Options
+-------
+
+.. option:: ChangePossibleSideEffects
----------------
vbvictor wrote:

Note that `StrictMode` default value should be `true`.

https://github.com/llvm/llvm-project/pull/142324


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