[PATCH v4 5/6] stdlib: Remove use of mergesort on qsort (BZ 21719)

[Paul Eggert]

On 2023-07-11 12:07, Adhemerval Zanella via Libc-alpha wrote:
> @@ -152,6 +151,7 @@ pop (stack_node *top, char **lo, char **hi, size_t *depth)
>   static inline size_t
>   parent (size_t i, unsigned int lsbit, size_t size)
>   {
> +  /* The below is logically equivalent to 'if (i & lsbit) i -= size'.  */
>     i -= size;
>     i -= size & -(i & lsbit);
>     return i / 2;

Doesn't the comment belong to the patch that introduced this code, not 
to patch 5?

Also, it's not clear which of the three lines the phrase "The below" 
refers to. I assume it refers to the line "i -= size & -(i & lsbit);". 
If so, this should be made clearer, e.g.:

     i -= size;
     i -= size & -(i & lsbit); /* i.e., 'if (i & lsbit) i -= size;' */
     return i / 2;