File: gfx7_data_mimg_atomic_cmp.rst

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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>`