%%% -*- erlang-indent-level: 2 -*- %%%------------------------------------------------------------------- %%% File : basic_num_bif.erl %%% Description : Taken from the compiler test suite %%%------------------------------------------------------------------- -module(basic_num_bif). -export([test/0]). %% Tests optimization of the BIFs: %% abs/1 %% float/1 %% float_to_list/1 %% integer_to_list/1 %% list_to_float/1 %% list_to_integer/1 %% round/1 %% trunc/1 test() -> Funs = [fun t_abs/0, fun t_float/0, fun t_float_to_list/0, fun t_integer_to_list/0, fun t_list_to_float_safe/0, fun t_list_to_float_risky/0, fun t_list_to_integer/0, fun t_round/0, fun t_trunc/0], lists:foreach(fun (F) -> ok = F() end, Funs). t_abs() -> %% Floats. 5.5 = abs(5.5), 0.0 = abs(0.0), 100.0 = abs(-100.0), %% Integers. 5 = abs(5), 0 = abs(0), 100 = abs(-100), %% The largest smallnum. OTP-3190. X = (1 bsl 27) - 1, X = abs(X), X = abs(X-1)+1, X = abs(X+1)-1, X = abs(-X), X = abs(-X-1)-1, X = abs(-X+1)+1, %% Bignums. BigNum = 13984792374983749, BigNum = abs(BigNum), BigNum = abs(-BigNum), ok. t_float() -> 0.0 = float(0), 2.5 = float(2.5), 0.0 = float(0.0), -100.55 = float(-100.55), 42.0 = float(42), -100.0 = float(-100), %% Bignums. 4294967305.0 = float(4294967305), -4294967305.0 = float(-4294967305), %% Extremely big bignums. Big = list_to_integer(lists:duplicate(2000, $1)), {'EXIT', {badarg, _}} = (catch float(Big)), ok. %% Tests float_to_list/1. t_float_to_list() -> test_ftl("0.0e+0", 0.0), test_ftl("2.5e+1", 25.0), test_ftl("2.5e+0", 2.5), test_ftl("2.5e-1", 0.25), test_ftl("-3.5e+17", -350.0e15), ok. test_ftl(Expect, Float) -> %% No on the next line -- we want the line number from t_float_to_list. Expect = remove_zeros(lists:reverse(float_to_list(Float)), []). %% Removes any non-significant zeros in a floating point number. %% Example: 2.500000e+01 -> 2.5e+1 remove_zeros([$+, $e|Rest], [$0, X|Result]) -> remove_zeros([$+, $e|Rest], [X|Result]); remove_zeros([$-, $e|Rest], [$0, X|Result]) -> remove_zeros([$-, $e|Rest], [X|Result]); remove_zeros([$0, $.|Rest], [$e|Result]) -> remove_zeros(Rest, [$., $0, $e|Result]); remove_zeros([$0|Rest], [$e|Result]) -> remove_zeros(Rest, [$e|Result]); remove_zeros([Char|Rest], Result) -> remove_zeros(Rest, [Char|Result]); remove_zeros([], Result) -> Result. %% Tests integer_to_list/1. t_integer_to_list() -> "0" = integer_to_list(0), "42" = integer_to_list(42), "-42" = integer_to_list(-42), "-42" = integer_to_list(-42), "32768" = integer_to_list(32768), "268435455" = integer_to_list(268435455), "-268435455" = integer_to_list(-268435455), "123456932798748738738" = integer_to_list(123456932798748738738), Big_List = lists:duplicate(2000, $1), Big = list_to_integer(Big_List), Big_List = integer_to_list(Big), ok. %% Tests list_to_float/1. t_list_to_float_safe() -> 0.0 = list_to_float("0.0"), 0.0 = list_to_float("-0.0"), 0.5 = list_to_float("0.5"), -0.5 = list_to_float("-0.5"), 100.0 = list_to_float("1.0e2"), 127.5 = list_to_float("127.5"), -199.5 = list_to_float("-199.5"), ok. %% This might crash the emulator... %% (Known to crash the Unix version of Erlang 4.4.1) t_list_to_float_risky() -> Many_Ones = lists:duplicate(25000, $1), _ = list_to_float("2."++Many_Ones), {'EXIT', {badarg, _}} = (catch list_to_float("2"++Many_Ones)), ok. %% Tests list_to_integer/1. t_list_to_integer() -> 0 = list_to_integer("0"), 0 = list_to_integer("00"), 0 = list_to_integer("-0"), 1 = list_to_integer("1"), -1 = list_to_integer("-1"), 42 = list_to_integer("42"), -12 = list_to_integer("-12"), 32768 = list_to_integer("32768"), 268435455 = list_to_integer("268435455"), -268435455 = list_to_integer("-268435455"), %% Bignums. 123456932798748738738 = list_to_integer("123456932798748738738"), _ = list_to_integer(lists:duplicate(2000, $1)), ok. %% Tests round/1. t_round() -> 0 = round(0.0), 0 = round(0.4), 1 = round(0.5), 0 = round(-0.4), -1 = round(-0.5), 255 = round(255.3), 256 = round(255.6), -1033 = round(-1033.3), -1034 = round(-1033.6), %% OTP-3722: X = (1 bsl 27) - 1, MX = -X, MXm1 = -X-1, MXp1 = -X+1, F = X + 0.0, X = round(F), X = round(F+1)-1, X = round(F-1)+1, MX = round(-F), MXm1 = round(-F-1), MXp1 = round(-F+1), X = round(F+0.1), X = round(F+1+0.1)-1, X = round(F-1+0.1)+1, MX = round(-F+0.1), MXm1 = round(-F-1+0.1), MXp1 = round(-F+1+0.1), X = round(F-0.1), X = round(F+1-0.1)-1, X = round(F-1-0.1)+1, MX = round(-F-0.1), MXm1 = round(-F-1-0.1), MXp1 = round(-F+1-0.1), 0.5 = abs(round(F+0.5)-(F+0.5)), 0.5 = abs(round(F-0.5)-(F-0.5)), 0.5 = abs(round(-F-0.5)-(-F-0.5)), 0.5 = abs(round(-F+0.5)-(-F+0.5)), %% Bignums. 4294967296 = round(4294967296.1), 4294967297 = round(4294967296.9), -4294967296 = -round(4294967296.1), -4294967297 = -round(4294967296.9), ok. t_trunc() -> 0 = trunc(0.0), 5 = trunc(5.3333), -10 = trunc(-10.978987), %% The largest smallnum, converted to float (OTP-3722): X = (1 bsl 27) - 1, F = X + 0.0, %% io:format("X = ~p/~w/~w, F = ~p/~w/~w, trunc(F) = ~p/~w/~w~n", %% [X, X, binary_to_list(term_to_binary(X)), %% F, F, binary_to_list(term_to_binary(F)), %% trunc(F), trunc(F), binary_to_list(term_to_binary(trunc(F)))]), X = trunc(F), X = trunc(F+1)-1, X = trunc(F-1)+1, X = -trunc(-F), X = -trunc(-F-1)-1, X = -trunc(-F+1)+1, %% Bignums. 4294967305 = trunc(4294967305.7), -4294967305 = trunc(-4294967305.7), ok.