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Chris Tate
fe406429eb
A local number[] candidate whose stores are exact integers but not all proven int32s (a distance array updated with dist[v] = dist[u]! + 1), and that is only ever allocated by new Array(n).fill(v), now holds SCR_ELEM_I32 slots when n is at least 4096. A shorter fill creates doubles, which fit a typical L1 data cache. The first store of a value that is not an int32 widens the array to doubles in place (scr_arr_widen_i32). An innermost loop that accesses such arrays tests their kinds once on entry (backend/llvm/int32-kind-loops.ts). Its fast copy reads and writes them as int32 arrays; a store that would widen one leaves for a copy that re-executes it with kind tests and finishes the loop on doubles. When the arrays already hold doubles, a copy accesses them as double arrays. Other accesses test the kind each time. Only these arrays take kind tests: every other array, and every program without one, emits the same code as before.