Pith Number

pith:QVZPG7HE

pith:2026:QVZPG7HEJ5QMZFTKFPU55YC73B

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Microarchitectural Co-Optimization for Sustained Throughput of RISC-V Multi-Lane Chaining Vector Processors

Weiying Wang, Zhiwei Zhang

Microarchitectural fixes to memory, control, and operand paths in the Ara RISC-V vector processor deliver a 1.33x geometric-mean speedup and close 12.2% of the roofline gap without added bandwidth or hardware.

arxiv:2604.22314 v2 · 2026-04-24 · cs.AR

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\pithnumber{QVZPG7HEJ5QMZFTKFPU55YC73B}

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3 Author claim open · sign in to claim

4 Citations open

5 Replications open

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The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

Experimental results show that, without increasing raw memory bandwidth or changing the main processor configuration, Ara-Opt achieves a geometric-mean speedup of 1.33x over baseline Ara. Under roofline-based normalization, the geometric-mean gap-closed ratio reaches 12.2%.

C2weakest assumption

That the proposed microarchitectural optimizations can be implemented in the Ara design without increasing hardware resources or altering the main processor configuration, and that the ideal multi-lane chaining execution model accurately captures the theoretical performance bound for comparison.

C3one line summary

Co-optimized microarchitecture for the Ara RISC-V vector processor delivers 1.33x geometric mean speedup over baseline by addressing data supply, dependence management, and operand delivery inefficiencies.

Receipt and verification

First computed	2026-06-04T01:08:50.431209Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8572f37ce44f60cc966a2be9dee05fd848be4169d57f72f58c48f99693d0ffcd

Aliases

arxiv: 2604.22314 · arxiv_version: 2604.22314v2 · doi: 10.48550/arxiv.2604.22314 · pith_short_12: QVZPG7HEJ5QM · pith_short_16: QVZPG7HEJ5QMZFTK · pith_short_8: QVZPG7HE

Agent API

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/QVZPG7HEJ5QMZFTKFPU55YC73B \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 8572f37ce44f60cc966a2be9dee05fd848be4169d57f72f58c48f99693d0ffcd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8dbec2f10df30a10a792b9cfa869bd02551433a0fc0b50b46e25033f0d09576d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.AR",
    "submitted_at": "2026-04-24T07:47:20Z",
    "title_canon_sha256": "bc4ae7ec7c6c3b877f43053b1992312a766b8fc43f6a6968fdd638ea5d4ebe03"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.22314",
    "kind": "arxiv",
    "version": 2
  }
}