Updates on the Low-Level Abstraction of Memory Access

Choosing the best memory layout for each hardware architecture is increasingly important as more and more programs become memory bound. For portable codes that run across heterogeneous hardware architectures, the choice of the memory layout for data structures is ideally decoupled from the rest of a program.
The low-level abstraction of memory access (LLAMA) is a C++ library that provides a zero-runtime-overhead abstraction layer, underneath which memory layouts can be freely exchanged, focusing on multidimensional arrays of nested, structured data.
It provides a framework for defining and switching custom memory mappings at compile time to define data layouts, data access and access instrumentation, making LLAMA an ideal tool to tackle memory-related optimization challenges in heterogeneous computing.
After its scientific debut, several improvements and extensions have been added to LLAMA. This includes compile-time array extents for zero memory overhead, support for computations during memory access, new mappings (e.g. int/float bit-packing or byte-swapping) and more. This contribution provides an overview of the LLAMA library, its recent development and an outlook of future activities.