D086 - Blockers ranked by effort, then shaders blocked

Status: decided Date: 2026-08-20

The shader worklist sorts blockers into two effort tiers - ordinary work, then work waiting on a subsystem - and ranks by shaders blocked within each tier, with occurrence count as a tiebreak. Undecodable and untranslatable instructions are reported apart.

Why: an instruction appearing ten thousand times in one shader blocks one shader. Ranking by what helps most ignores what is reachable, so a week of work would sit above an afternoon's. The tier comes from the translator's existing blocked list, so there is no second table.

Rejected:

• Raw frequency: rewards one heavy shader.
• A blocked-over-effort score: precision invented from a guess.