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Adding Support to Vector Permutation Instructions to Olympia�

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�sai.govardhan@incoresemi.com

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(riscv-perf-modeling) SIG Meeting: 2nd June, 2025

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Adding Support to Vector Permutation Instructions to Olympia�sai.govardhan@incoresemi.com (riscv-perf-modeling: 2nd June, 2025)

VLEN: Vector Register Length in bits

ELEN: Largest Element Width in bits�

sew: Selected Element Width in bits

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lmul: Register Grouping Multiple

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vl: Application Vector Length

(unit: number of elements)

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vlmax: Maximum Vector Length

(unit: number of elements)��8 <= sew <= ELEN <= VLEN

�0 <= vl <= [vlmax = VLEN x lmul / sew]

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Adding Support to Vector Permutation Instructions to Olympia�sai.govardhan@incoresemi.com (riscv-perf-modeling: 2nd June, 2025)

Vector Slide Instructions - Proposal��vslideup.vx vd, vs2, rs1��Take VLMAX = 512b, LMUL = 1, sew = 64b (8 elements)�

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