protected internal OffHeapNumberArray(long length, int itemSize, long @base, MemoryAllocationTracker allocationTracker) : base(itemSize, @base)
{
UnsafeUtil.assertHasUnsafe();
this.LengthConflict = length;
this.AllocationTracker = allocationTracker;
long dataSize = length * itemSize;
bool itemSizeIsPowerOfTwo = Integer.bitCount(itemSize) == 1;
if (UnsafeUtil.allowUnalignedMemoryAccess || !itemSizeIsPowerOfTwo)
{
// we can end up here even if we require aligned memory access. Reason is that item size
// isn't power of two anyway and so we have to fallback to safer means of accessing the memory,
// i.e. byte for byte.
_allocatedBytes = dataSize;
this._allocatedAddress = this.Address = UnsafeUtil.allocateMemory(_allocatedBytes, allocationTracker);
}
else
{
// the item size is a power of two and we're required to access memory aligned
// so we can allocate a bit more to ensure we can get an aligned memory address to start from.
_allocatedBytes = dataSize + itemSize - 1;
this._allocatedAddress = UnsafeUtil.allocateMemory(_allocatedBytes, allocationTracker);
this.Address = UnsafeUtil.alignedMemory(_allocatedAddress, itemSize);
}
}
