warp.tile\_stack\_pop
=====================

.. currentmodule:: warp._src.lang

.. function:: tile_stack_pop(s: Any) -> tuple[Any, int]

   .. wp-function-tags::
      :kernel: true
      :python: false
      :differentiable: false

   Pop a value from a tile stack.
   
   Every thread in the block must reach this call. Popping an empty stack is harmless.
   
   :param s: The tile stack, from :func:`~warp.tile_stack`
   
   :returns: A tuple ``(value, slot)``. Each thread receives at most one element. ``slot`` is
             the index of the slot the element was taken from, in ``[0, capacity - 1]``, or
             ``-1`` if the stack is empty or has no element left for that thread. Test ``slot``
             for ``>= 0`` before using ``value``. Which thread receives which element is
             unspecified; use ``slot`` rather than the thread index to place the result.
   
   See :func:`~warp.tile_stack` for a usage example.