prefer-slang

Set SYNTH_HDL_FRONTEND=slang for synthesis unless the design's Verilog cannot go through slang; yosys's own Verilog frontend is effectively deprecated for SystemVerilog and its generate-block expansion can take minutes on a netlist that synthesises in seconds. Use when configuring a design, when canonicalisation is slow, or when choosing between the frontends.

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Dépôt: The-OpenROAD-Project/bazel-orfs
Dernière activité de la source: 18 septembre 2026 à 07:34
Langue détectée de SKILL.md: anglais
Étoiles: 27
Forks: 24

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npx skills add https://github.com/The-OpenROAD-Project/bazel-orfs --skill prefer-slang

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SKILL.md

Instructions source · Aperçu en lecture seule

name: prefer-slang
description: Set SYNTH_HDL_FRONTEND=slang for synthesis unless the design's Verilog cannot go through slang; yosys's own Verilog frontend is effectively deprecated for SystemVerilog and its generate-block expansion can take minutes on a netlist that synthesises in seconds. Use when configuring a design, when canonicalisation is slow, or when choosing between the frontends.

# prefer-slang The instructions for this skill are maintained in the shared Claude slash command. Please read and follow the single source of truth: [../../../.claude/commands/prefer-slang.md](../../../.claude/commands/prefer-slang.md)

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repair-timing-grt

Investigate OpenROAD global-route repair_timing correctly — the grt "grind"/timeout, hold- and setup-buffer insertion. Covers why a skip-repair (fast) grt measures nothing about repair, why repair_timing must run inside global_route.tcl on the pre-GR ODB, how to split the grind into setup vs hold before blaming either, why the win is measured as clk_period-WNS in picoseconds rather than as a percentage of WNS, and why a design that closes measures nothing about a repair knob. Use when a grt stage times out or runs for hours, when a change is meant to affect repair_timing, or when reasoning about hold vs setup buffer insertion at global route.

2026-09-27

cache-miss

Ask whether a target is a remote cache hit on this machine without building it (a capture kills every miss as it appears and lists the actions behind it as not reached, minutes on a laptop), and find out why it is not when another machine built it: a few kilobytes of key evidence per machine (Bazel version, commit and tree, redacted options, tool digests, the source files read, one line per action with its cache key and which of arguments, environment, tools, sources or design inputs moved), committed next to the design and diffed, naming the first action that differs and the source file behind it. Says what committed evidence promises and when to recapture. Use before building any long flow target, when XSTile_grt or any stage rebuilds unexpectedly, or before blaming Scala, a toolchain or the cache.

2026-09-26

dogfooding

The standing rules learned building XiangShan with bazel-orfs, for any large design: fix the tools and never the design (no multicycle or false-path exceptions, no added RTL registers); hard stops where a problem is made; finish the macros before the parent; a design README says what is; public PR tests check intended behaviour, not golden .ok output; a PR on an unmerged upstream PR is a draft; choices in the flow script, facts in the .odb; relative paths; unattended means continue; Chesterton's fence, check what our flow skipped before blaming a tool; watch a run that grinds past its expected time. Use before proposing a fix for a timing or flow problem found on a big design, before writing a design README or status, before opening a PR that depends on another, and before writing a test for a public PR.

2026-09-25

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prefer-slang

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