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.. _amdgpu_synid7_data_mimg_atomic_cmp:
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:* depends on :ref:`dmask<amdgpu_synid_dmask>` and :ref:`tfe<amdgpu_synid_tfe>`:
* :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.
* :ref:`tfe<amdgpu_synid_tfe>` adds 1 dword if specified.
Note. The surface data format is indicated in the image resource constant but not in the instruction.
*Operands:* :ref:`v<amdgpu_synid_v>`
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