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The header called the range's size the minimum because a 3-operand MMI op needs three homes at once. The floor is three; the slots above it keep an FPU multiply-accumulate's four FPR homes inside the call-surviving range. EeFuzz.CalleeSavedNeonBudget reads high-water marks of the per-op needed set from a test-build probe in _clearNeededNEONregs.