[libcxx-commits] [libcxx] [libc++] Add basic constant folding for std::format (PR #107197)

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``````````bash
git-clang-format --diff 956cfa69b153a0e798060f67e713790eeefebc04 0db3132b818ba1fd1f8d5b5d684e5170d31375df --extensions ,h,cpp -- libcxx/include/__config libcxx/include/__format/format_functions.h libcxx/test/benchmarks/format/format.bench.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/libcxx/include/__format/format_functions.h b/libcxx/include/__format/format_functions.h
index fd71f53b51..43d1a6ce1f 100644
--- a/libcxx/include/__format/format_functions.h
+++ b/libcxx/include/__format/format_functions.h
@@ -456,7 +456,6 @@ template <class _CharT>
 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<basic_string<_CharT>> __try_constant_folding_format(
     basic_string_view<_CharT> __fmt,
     basic_format_args<basic_format_context<back_insert_iterator<__format::__output_buffer<_CharT>>, _CharT>> __args) {
-
   // Fold strings not containing '{' or '}' to just return the string
   if (bool __is_identity = [&] [[__gnu__::__pure__]] // Make sure the compiler knows this call can be eliminated
       { return std::ranges::find_first_of(__fmt, array{'{', '}'}) == __fmt.end(); }();

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https://github.com/llvm/llvm-project/pull/107197