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.. _amdgpu_synid_gfx90a_vdata_999247:
Input data for an atomic instruction.
Optionally, this operand may be used to store output data:
* If :ref:`glc<amdgpu_synid_glc>` is specified, gets the memory value before the operation.
*Size:* depends on :ref:`dmask<amdgpu_synid_dmask>`:
* :ref:`dmask<amdgpu_synid_dmask>` may specify 2 data elements for 32-bit-per-pixel surfaces or 4 data elements for 64-bit-per-pixel surfaces. Each data element occupies 1 dword.
Note: the surface data format is indicated in the image resource constant, but not in the instruction.
*Operands:* :ref:`v<amdgpu_synid_v>`, :ref:`a<amdgpu_synid_a>`