facebook/zstd

IBM Linux on z SIMD optimization

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#2,679 opened on 2021年5月21日

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Announcehelp wanted

説明

Is your feature request related to a problem? Please describe. IBM z architecture provides SIMD capabilities that can be utilized for zstd optimization similar to SSE and Neon SIMD optimizations that have been contributrd to zstd.

Describe the solution you'd like Optimize zstd to utilize IBMz VX SIMD intrinsics in zstd_lazy.c and ztsd_compress.c equivalent to optimization for SSE and Neon.

Describe alternatives you've considered Because zstd has implemented architecture-specific optimizations for other architectures, a hand-coded implementation has been shown to provide unique benefits above auto-vectorization.

Additional context Financial bounty from IBM available for negotiation. Inquiries from interested developers welcome.

コントリビューターガイド

技術スタック
c
領域
performance
Issue 種別
feature
難度新しい貢献者にとっての実装難度です。1 は非常に小さな変更、5 は専門的な作業です。
4
推定時間経験ある貢献者が調査、実装、テスト、pull request 準備にかけるおおよその時間範囲です。
over 1 week
活動状況Issue が今どれだけ取り組みやすいかを示します。新しい、活発、古い、ブロック中、またはメンテナー入力待ちなどです。
stale
明確さ期待される変更、受け入れ条件、次の手順がどれだけ明確かを示します。
mostly clear
前提条件
C programmingSIMD intrinsics knowledgeIBM z architecture understandingzstd codebase familiarity
初心者向け度初回貢献者にどれだけ取り組みやすいかを 1-100 で推定したスコアです。
15
調査方針
The issue requests implementing IBM z VX SIMD intrinsics optimizations in zstd lazy.c and zstd compress.c, similar to existing SSE and Neon implementations. The contributor should study the existing SSE and Neon code paths, refer to IBM z architecture documentation for VX intrinsics, and propose a design. Maintainer feedback on scope and acceptance criteria is needed.