![]() The Tile is connected in a coherent fashion to other tiles using a custom CHI.B Mesh interconnect developed by Extoll. ![]() The RVV tile also contains physically distributed, logically-shared 256KB L2 cache developed by Chalmers/Forth. The interface is realized using, purpose-built Open Vector Interface 1.0 specification. Avispado, tightly coupled with the vector processing unit Vitruvius, developed by BSC and the University of Zagreb. RVV vector tile consists of the general-purpose, 64-bit RISC-V core Avispado, developed by Semydynamics. Building on top of SGA1 and coordinating its activities with the EU Pilot project, SGA2 will contribute to demonstrate how it is possible to have a very cost-effective EU independent technology for the HPC and other domains. The SGA2 work on the STX will, beyond general improvements, address challenges identified in SGA1 such as a focus on sparse access patterns, mixed precision and new number formats including POSIT.īesides the continuation of activities from SGA1, SGA2 stream 3 will also include efforts to integrate other specialized cores or potential accelerator technologies such as the Kalray processor and the Menta FPGA devices under the EPAC RISC-V framework. Remaining tiles will complement the EPAC in specific computation kernels from stencil/deep learning and approximate computing domains. SGA2 will also extend the SDV environment and provide improved framework for partners and external users willing to gain the head start and experience in preparing their codebase for high-throughput processor with vector extensions based on EPAC architecture. System software infrastructure (compiler, runtimes, libraries and operating system) will be upgraded and maintained. And all of that migrated to GF12 technology. ![]() Moreover, EPaC2.0 will feature improved cache management policies, support of very large number of outstanding memory requests, on chip memory controller, inclusion of memory compression capabilities, improved NoC, chip to chip connectivity and PCIe. New VPU will include more FPU units per tile. By the end of SGA2, the consortium will deliver the second test chip EPAC2.0 with additional features such as support for v1.0 of RISC-V Vector Extensions, improved microarchitecture features such as branch prediction, new data types, out-of-order execution, and interface to the VPU. Continuous integration system based on the FPGA implementation was very useful to identify and verify fixes and co-design improvements for the next versions of the chip that will be done in SGA2.Ĭontinuing the developments from SGA1, SGA2 aims to produce a new EPAC1.5 test chip which will include improvements and fixes realized through the employed co-design methodology based on the SDV described previously. Another important component developed under SGA1 is the additions for RISC-V Vector extensions into the Compiler explorer – an open-source web application for interactive code generation and observations. Besides being usable as an accelerator for a general-purpose host, Avispado RISC-V core with vector extensions is a self-hosted general purpose HPC node running Linux. Software Development Vehicles (SDVs) provided for early application porting and analysis, include Vehave, the software emulator of the RISC-V and Vector ISA, and an FPGA implementation of the RTL design that proved extremely useful for verification of the hardware and the system software including a vectorising compiler and a Linux kernel.
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