Function mi_segment_slice_split

3rd/mimalloc-2.0.9/src/segment.c:725–735

}

static void mi_segment_slice_split(mi_segment_t* segment, mi_slice_t* slice, size_t slice_count, mi_segments_tld_t* tld) {
  mi_assert_internal(_mi_ptr_segment(slice) == segment);
  mi_assert_internal(slice->slice_count >= slice_count);
  mi_assert_internal(slice->xblock_size > 0); // no more in free queue
  if (slice->slice_count <= slice_count) return;
  mi_assert_internal(segment->kind != MI_SEGMENT_HUGE);
  size_t next_index = mi_slice_index(slice) + slice_count;
  size_t next_count = slice->slice_count - slice_count;
  mi_segment_span_free(segment, next_index, next_count, false /* don't decommit left-over part */, tld);
  slice->slice_count = (uint32_t)slice_count;
}

static mi_page_t* mi_segments_page_find_and_allocate(size_t slice_count, mi_arena_id_t req_arena_id, mi_segments_tld_t* tld) {
  mi_assert_internal(slice_count*MI_SEGMENT_SLICE_SIZE <= MI_LARGE_OBJ_SIZE_MAX);