The MEEP VPU supports RISC-V vector instructions v0.7.1, and is equipped to work in two modes of operations: ACME-classic-mode, and ACME- mode. ACME-classic-mode is applicable when the operand vectors are short dense vectors. To exploit the available spatial and temporal localities in these scenarios, the vector loads and stores are carried out through the traditional cache hierarchy. The limit for operand vector length in this mode is determined by the vector register space on the VPU. The MEEP VPU operates in ACME-mode for operand vectors longer than this limit. The ACME-mode is also applicable for short, and long sparse vectors and is effective when the operand vectors do not achieve significant performance gains due to the normal cache hierarchy (i.e. streaming, non-unit stride or sparse memory accesses).