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 | .. _amdgpu_synid_gfx90a_vdata_4: | 
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 | vdata | 
 | ===== | 
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 | Input data for an atomic instruction. | 
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 | Optionally may serve as an output data: | 
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 | * If :ref:`glc<amdgpu_synid_glc>` is specified, gets the memory value before the operation. | 
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 | *Size:* depends on :ref:`dmask<amdgpu_synid_dmask>` and :ref:`tfe<amdgpu_synid_tfe>`: | 
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 | * :ref:`dmask<amdgpu_synid_dmask>` may specify 1 data element for 32-bit-per-pixel surfaces or 2 data elements for 64-bit-per-pixel surfaces. Each data element occupies 1 dword. | 
 | * :ref:`tfe<amdgpu_synid_tfe>` adds 1 dword if specified. | 
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 |   Note: the surface data format is indicated in the image resource constant but not in the instruction. | 
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 | *Operands:* :ref:`v<amdgpu_synid_v>`, :ref:`a<amdgpu_synid_a>` |