File: 1-code-structure.md

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title: Code Structure

# GPU Backend Code Architecture

```
dbcsr/
-- src/
---- acc/: contains interfaces to ACC and LIBSMM (top-level) as well as backends (subdirectories)
------ cuda/: CUDA backend
------ hip/: HIP backend
------ cuda_hip/: common code for CUDA and HIP
------ libsmm_acc/: small matrix-matrix operations on GPU (can use either cuda or hip interface)
------ opencl/: OpenCL backend
------ opencl/smm/: LIBSMM implementation based on OpenCL
```