[libc] [llvm] [libc] Improve qsort (PR #120450)

[Michael Jones via llvm-commits]

================
@@ -7,10 +7,18 @@
 //===----------------------------------------------------------------------===//
 
 #include "SortingTest.h"
-#include "src/stdlib/heap_sort.h"
+#include "src/stdlib/qsort_util.h"
 
-void sort(const LIBC_NAMESPACE::internal::Array &array) {
-  LIBC_NAMESPACE::internal::heap_sort(array);
+void heap_sort(void *array, size_t array_size, size_t elem_size,
+               int (*compare)(const void *, const void *)) {
+
+  constexpr bool USE_QUICKSORT = false;
+
+  LIBC_NAMESPACE::internal::unstable_sort_impl<USE_QUICKSORT>(
+      array, array_size, elem_size,
+      [compare](const void *a, const void *b) noexcept -> bool {
+        return compare(a, b) < 0;
+      });
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michaelrj-google wrote:

why not call heapsort directly?

https://github.com/llvm/llvm-project/pull/120450