[libc-commits] [libc] [libc][stdbit] implement stdc_bit_floor (C23) (PR #84233)

[Nick Desaulniers via libc-commits]

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@@ -169,7 +169,7 @@ template <typename T, typename = cpp::enable_if_t<cpp::is_unsigned_v<T>>>
 [[nodiscard]] LIBC_INLINE constexpr T bit_floor(T value) {
   if (!value)
     return 0;
-  return T(1) << (cpp::bit_width(value) - 1);
+  return static_cast<T>(T(1) << (cpp::bit_width(value) - 1));
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nickdesaulniers wrote:

Note to reviewers: without this change, I observe an integer truncation warning (promoted to error) for types smaller than int. They undergo implicit promotion from the binary operator `<<`.

https://github.com/llvm/llvm-project/pull/84233