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.. _amdgpu_synid9_data_smem_atomic128:

sdata
===========================

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:* 4 dwords.

*Operands:* :ref:`s<amdgpu_synid_s>`, :ref:`ttmp<amdgpu_synid_ttmp>`