llvm/llvm/docs/AMDGPU/gfx9_vdata_84fab6.rst

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.. _amdgpu_synid_gfx9_vdata_84fab6:

vdata
=====

Input data for an atomic instruction.

Optionally, this operand may be used to store 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>`:

* :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.


  Note: the surface data format is indicated in the image resource constant, but not in the instruction.

*Operands:* :ref:`v<amdgpu_synid_v>`