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  .. _amdgpu_synid8_data_buf_atomic128:
  
  vdata
  ===========================
  
  Input data for an atomic instruction.
  
  Optionally may serve as an output data:
  
  * If :ref:`glc<amdgpu_synid_glc>` is specified, gets the memory value before the operation.
  
  *Size:* 4 dwords by default. :ref:`tfe<amdgpu_synid_tfe>` adds 1 dword if specified.
  
  *Operands:* :ref:`v<amdgpu_synid_v>`
  