2026-06-27T10:31:16Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/720642024-08-21T15:57:57Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Mallasén Quintana, David author Murillo Montero, Raúl author Del Barrio García, Alberto Antonio author Botella Juan, Guillermo author Prieto Matías, Manuel 2023-06-22T11:03:53Z 2023-06-22T11:03:53Z 2022-07 2168-6750 10.1109/TETC.2022.3187199 https://hdl.handle.net/20.500.14352/72064 http://dx.doi.org/10.1109/TETC.2022.3187199 https://ieeexplore.ieee.org/ The posit representation for real numbers is an alternative to the ubiquitous IEEE 754 floating-point standard. In this work, we present PERCIVAL, an application-level posit RISC-V core based on CVA6 that can execute all posit instructions, including the quire fused operations. This solves the obstacle encountered by previous works, which only included partial posit support or which had to emulate posits in software. In addition, Xposit, a RISC-V extension for posit instructions is incorporated into LLVM. Therefore, PERCIVAL is the first work that integrates the complete posit instruction set in hardware. These elements allow for the native execution of posit instructions as well as the standard floating-point ones, further permitting the comparison of these representations. FPGA and ASIC synthesis show the hardware cost of implementing 32-bit posits and highlight the significant overhead of including a quire accumulator. However, results show that the quire enables a more accurate execution of dot products. In general matrix multiplications, the accuracy error is reduced up to 4 orders of magnitude. Furthermore, performance comparisons show that these accuracy improvements do not hinder their execution, as posits run as fast as single-precision floats and exhibit better timing than double-precision floats, thus potentially providing an alternative representation. eng Atribución-NoComercial-SinDerivadas 3.0 España PERCIVAL: Open-source posit RISC-V core with quire capability journal article URL https://docta.ucm.es/bitstreams/ce29c789-8e84-4752-896d-1971705e18ce/download File MD5 d3e5d48ce61ad3cfb48d0e369bfc8bfb 4933569 application/pdf Piñuel 03 preprint+CC(nc-nd).pdf URL https://docta.ucm.es/bitstreams/d99e28d5-ec65-4282-862c-d90ce256bd64/download File MD5 79ae939eceb009da54491477e601d7c4 61599 text/plain Piñuel 03 preprint+CC(nc-nd).pdf.txt