Function mi_bitmap_mask_

3rd/mimalloc-2.0.9/src/bitmap.c:29–35

The bit mask for a given number of blocks at a specified bit index.

// The bit mask for a given number of blocks at a specified bit index.
static inline size_t mi_bitmap_mask_(size_t count, size_t bitidx) {
  mi_assert_internal(count + bitidx <= MI_BITMAP_FIELD_BITS);
  mi_assert_internal(count > 0);
  if (count >= MI_BITMAP_FIELD_BITS) return MI_BITMAP_FIELD_FULL;
  if (count == 0) return 0;
  return ((((size_t)1 << count) - 1) << bitidx);
}


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