%% how replay decides which pre-passes run over the range up to the next barrier.
flowchart TB
    subgraph now["after: the recording side sums flags"]
        C1["record a command"] --> C2["OR its flags into<br/>the range's word"]
        C2 --> C3["barrier record or<br/>list header holds the word"]
        C3 --> C4["replay reads one word,<br/>runs only flagged passes"]
    end
    subgraph scan["before: one scan"]
        B1["walk the range once,<br/>read one field per record"] --> B2["run only passes<br/>with work"]
    end
    subgraph before["Before: five walks"]
        A1["indices"] --> A2["indirect"] --> A3["predication"] --> A4["indirect draws"] --> A5["stream output"]
    end