Function mi_commit_mask_create

3rd/mimalloc-2.0.9/src/segment.c:55–80

}

static void mi_commit_mask_create(size_t bitidx, size_t bitcount, mi_commit_mask_t* cm) {
  mi_assert_internal(bitidx < MI_COMMIT_MASK_BITS);
  mi_assert_internal((bitidx + bitcount) <= MI_COMMIT_MASK_BITS);
  if (bitcount == MI_COMMIT_MASK_BITS) {
    mi_assert_internal(bitidx==0);
    mi_commit_mask_create_full(cm);
  }
  else if (bitcount == 0) {
    mi_commit_mask_create_empty(cm);
  }
  else {
    mi_commit_mask_create_empty(cm);
    size_t i = bitidx / MI_COMMIT_MASK_FIELD_BITS;
    size_t ofs = bitidx % MI_COMMIT_MASK_FIELD_BITS;
    while (bitcount > 0) {
      mi_assert_internal(i < MI_COMMIT_MASK_FIELD_COUNT);
      size_t avail = MI_COMMIT_MASK_FIELD_BITS - ofs;
      size_t count = (bitcount > avail ? avail : bitcount);
      size_t mask = (count >= MI_COMMIT_MASK_FIELD_BITS ? ~((size_t)0) : (((size_t)1 << count) - 1) << ofs);
      cm->mask[i] = mask;
      bitcount -= count;
      ofs = 0;
      i++;
    }
  }
}

size_t _mi_commit_mask_committed_size(const mi_commit_mask_t* cm, size_t total) {
  mi_assert_internal((total%MI_COMMIT_MASK_BITS)==0);