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* Allow 62-bit bound on Random.int on 64-bit systems * Add Random.int63 Behaves equivalently on 64-bit and JavaScript and allows 62-bit upperbound on 64-bit systems. * Use upper bits of each 30-bit random int * Simple chi-square test for functions from module Random * Fix 32-bit path (unnecessary use of wrong mask) * Add a test for the JavaScript case * Remove the unnecessary extra bit * Random.full_int instead of Random.int63 Co-authored-by: Xavier Leroy <xavier.leroy@college-de-france.fr>
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(* TEST *) | ||
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(* Ensure that a bound which is negative on 31-bit OCaml but positive on 32-bit | ||
OCaml produces the same result on 64-bit OCaml. *) | ||
let bound = 0x6FFFFFFF in | ||
if bound < 0 then (* 31-bit integers *) | ||
print_endline "6beb775a" | ||
else (* 32 or 64-bit integers *) | ||
let s = Random.State.make [| 42 |] in | ||
Printf.printf "%x\n" (Random.State.full_int s bound) |
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6beb775a |