https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96942

--- Comment #4 from Dmitriy Ovdienko <dmitriy.ovdienko at gmail dot com> ---
Created attachment 49190
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49190&action=edit
Modified solution with custom allocator based on malloc (simplified, single
threaded)

Attached is a benchmark based on Malloc allocator, modified simplified single
threaded.

Following is a execution time for different tree depth:

                    depth_17    depth_18    depth_19
bt_pmr_0thrd        0.105s      0.313s      0.577s
bt_malloc_0thrd     0.087s      0.147s      0.448s

Commandline is:

  time ./bt_pmr_0thrd <depth>
  time ./bt_malloc_0thrd <depth>

On depth=18 boundary there is 2x times difference.

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