[libcxx-commits] [libcxx] [libcxx][algorithm] Optimize std::stable_sort via radix sort algorithm (PR #104683)

[Nikolas Klauser via libcxx-commits]

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=?utf-8?b?0JTQvNC40YLRgNC40Lkg0JjQtw=?Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/104683 at github.com>


================
@@ -190,6 +196,28 @@ struct __stable_sort_switch {
   static const unsigned value = 128 * is_trivially_copy_assignable<_Tp>::value;
 };
 
+#if _LIBCPP_STD_VER >= 17
+template <class _Tp>
+constexpr unsigned __radix_sort_min_bound() {
+  static_assert(is_integral<_Tp>::value);
+  if constexpr (sizeof(_Tp) == 1) {
+    return 1 << 8;
+  }
+
+  return 1 << 10;
+}
+
+template <class _Tp>
+constexpr unsigned __radix_sort_max_bound() {
+  static_assert(is_integral<_Tp>::value);
+  if constexpr (sizeof(_Tp) == 8) {
----------------
philnik777 wrote:

Should this be `sizeof(_Tp) >= 8` instead? We support `__int128`.

https://github.com/llvm/llvm-project/pull/104683