pub static STEP_VM_INTLANE_FIRE: AtomicU64Expand description
r1021 — how often the integer lane answers, and how often a row makes it hand back. Round 480 was spent on a branch that turned out unreachable, so “is it even reached” stays a number here too — and the fallback counter is the one that matters for correctness review: it is every row the lane declined to decide.