llvm-project/llvm/docs/AMDGPU/gfx8_data_mimg_atomic_reg.rst

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.. _amdgpu_synid8_data_mimg_atomic_reg:
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 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.
Note: the surface data format is indicated in the image resource constant but not in the instruction.
*Operands:* :ref:`v<amdgpu_synid_v>`