================
@@ -0,0 +1,47 @@
+```{title} clang-tidy - modernize-use-bit-cast
+```
+
+# modernize-use-bit-cast
+
+Finds `memcpy`-based type punning that can be rewritten as `std::bit_cast` in
+C++20 and later.
+
+```cpp
+float src = 1.0f;
+unsigned int dst;
+std::memcpy(&dst, &src, sizeof(src));
+```
+
+This is rewritten to:
+
+```cpp
+float src = 1.0f;
+unsigned int dst;
+dst = std::bit_cast<unsigned int>(src);
+```
+
+The fix replaces only the `memcpy` call. It does not rewrite a preceding
+declaration into `auto dst = ...`.
+
+It matches only object-to-object copies where:
+
+- both object types are trivially copyable,
+- the destination can be assigned from `std::bit_cast`, so raw C array
+ destinations are excluded,
+- the source and destination are not the same type after removing aliases and
+ cv-qualifiers,
+- the size argument is `sizeof` of either copied type, and
+- the `memcpy` result is not used.
+
+It intentionally does not diagnose macro expansions, dependent template
+cases, unevaluated contexts, or unrelated overloads such as a user-defined
+`memcpy`.
+
+If needed, the fix also inserts `#include <bit>`.
+
+## Options
+
+### IncludeStyle
----------------
zwuis wrote:
Use code blocks like the title. You can refer to other documents.
https://github.com/llvm/llvm-project/pull/189962
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