101 lines
2.4 KiB
OCaml
101 lines
2.4 KiB
OCaml
open! Import
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open! Int32
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let of_ints = List.map ~f:of_int_exn
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let examples = of_ints [ -1; 0; 1; 2; 3; 4; 5; 7; 8; 9; 63; 64; 65 ]
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let examples_64_bit = [ min_value; succ min_value; pred max_value; max_value ]
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let print_for ints f =
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List.iter ints ~f:(fun i ->
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print_s
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[%message "" ~_:(i : int32) ~_:(Or_error.try_with (fun () -> f i) : int Or_error.t)])
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;;
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let%expect_test "[floor_log2]" =
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print_for examples floor_log2;
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[%expect
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{|
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(-1 (Error ("[Int32.floor_log2] got invalid input" -1)))
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(0 (Error ("[Int32.floor_log2] got invalid input" 0)))
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(1 (Ok 0))
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(2 (Ok 1))
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(3 (Ok 1))
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(4 (Ok 2))
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(5 (Ok 2))
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(7 (Ok 2))
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(8 (Ok 3))
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(9 (Ok 3))
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(63 (Ok 5))
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(64 (Ok 6))
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(65 (Ok 6))
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|}]
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;;
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let%expect_test ("[floor_log2]" [@tags "64-bits-only"]) =
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print_for examples_64_bit floor_log2;
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[%expect
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{|
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(-2_147_483_648 (Error ("[Int32.floor_log2] got invalid input" -2147483648)))
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(-2_147_483_647 (Error ("[Int32.floor_log2] got invalid input" -2147483647)))
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(2_147_483_646 (Ok 30))
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(2_147_483_647 (Ok 30))
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|}]
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;;
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let%expect_test "[ceil_log2]" =
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print_for examples ceil_log2;
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[%expect
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{|
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(-1 (Error ("[Int32.ceil_log2] got invalid input" -1)))
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(0 (Error ("[Int32.ceil_log2] got invalid input" 0)))
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(1 (Ok 0))
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(2 (Ok 1))
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(3 (Ok 2))
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(4 (Ok 2))
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(5 (Ok 3))
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(7 (Ok 3))
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(8 (Ok 3))
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(9 (Ok 4))
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(63 (Ok 6))
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(64 (Ok 6))
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(65 (Ok 7))
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|}]
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;;
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let%expect_test ("[ceil_log2]" [@tags "64-bits-only"]) =
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print_for examples_64_bit ceil_log2;
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[%expect
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{|
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(-2_147_483_648 (Error ("[Int32.ceil_log2] got invalid input" -2147483648)))
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(-2_147_483_647 (Error ("[Int32.ceil_log2] got invalid input" -2147483647)))
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(2_147_483_646 (Ok 31))
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(2_147_483_647 (Ok 31))
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|}]
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;;
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let%test_module "int_math" =
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(module struct
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let test_cases () =
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of_ints
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[ 0b10101010
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; 0b1010101010101010
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; 0b101010101010101010101010
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; 0b10000000
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; 0b1000000000001000
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; 0b100000000000000000001000
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]
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;;
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let%test_unit "ceil_pow2" =
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List.iter (test_cases ()) ~f:(fun x ->
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let p2 = ceil_pow2 x in
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assert (is_pow2 p2 && p2 >= x && x >= p2 / of_int_exn 2))
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;;
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let%test_unit "floor_pow2" =
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List.iter (test_cases ()) ~f:(fun x ->
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let p2 = floor_pow2 x in
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assert (is_pow2 p2 && of_int_exn 2 * p2 >= x && x >= p2))
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;;
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end)
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;;
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