%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2002-2018. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(float_SUITE).
-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1,
init_per_group/2,end_per_group/2,
pending/1,bif_calls/1,math_functions/1,mixed_float_and_int/1,
subtract_number_type/1,float_followed_by_guard/1]).
-include_lib("common_test/include/ct.hrl").
suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[pending, bif_calls, math_functions,
mixed_float_and_int, subtract_number_type,
float_followed_by_guard].
groups() ->
[].
init_per_suite(Config) ->
test_lib:recompile(?MODULE),
Config.
end_per_suite(_Config) ->
ok.
init_per_group(_GroupName, Config) ->
Config.
end_per_group(_GroupName, Config) ->
Config.
%% Thanks to Tobias Lindahl <[email protected]>
%% Shows the effect of pending exceptions on the x86.
pending(Config) when is_list(Config) ->
case catch float_mul(1, 1.1e300, 3.14e300) of
{'EXIT',{badarith,_}} -> ok;
Other -> ct:fail({expected_exception,Other})
end,
0.0 = float_sub(2.0).
float_sub(A)->
catch A - 2.0.
float_mul(0, _, _)->
ok;
float_mul(Iter, A, B) when is_float(A), is_float(B) ->
_ = A*B,
float_mul(Iter-1, A, B).
%% Thanks to Mikael Pettersson and Tobias Lindahl (HiPE).
bif_calls(Config) when is_list(Config) ->
{'EXIT',{badarith,_}} = (catch bad_arith(2.0, 1.7)),
{'EXIT',{badarith,_}} = (catch bad_arith_again(2.0, [])),
{'EXIT',{badarith,_}} = (catch bad_arith_xor(2.0, [])),
{'EXIT',{badarith,_}} = (catch bad_arith_hd(2.0, [])),
{'EXIT',{badarith,_}} = (catch bad_negate(2.0, 1.7)),
ok.
bad_arith(X, Y) when is_float(X) ->
X1 = X * 1.7e+308,
X2 = X1 + 1.0,
Y1 = Y * 2, %Calls erts_mixed_times/2.
%(A BIF call.)
{X2, Y1}.
bad_arith_xor(X, Y) when is_float(X) ->
X1 = X * 1.7e+308,
Y1 = Y xor true, %A failing BIF call.
{X1 + 1.0, Y1}.
bad_arith_hd(X, Y) when is_float(X) ->
X1 = X * 1.7e+308,
Y1 = hd(Y), %A failing BIF call.
{X1 + 1.0, Y1}.
bad_arith_again(X, Y) when is_float(X) ->
X1 = X * 1.7e+308,
Y1 = element(1, Y), %A failing BIF call.
{X1 + 1.0, Y1}.
bad_negate(X, Y) when is_float(X) ->
X1 = X * 1.7e+308,
X2 = X1 + 1.0,
Y1 = -Y, %BIF call.
{X2, Y1}.
%% Some math functions are not implemented on all platforms.
-define(OPTIONAL(Expected, Expr),
try
Expected = Expr
catch
error:undef -> ok
end).
math_functions(Config) when is_list(Config) ->
%% Mostly silly coverage.
0.0 = math:tan(0),
0.0 = math:atan2(0, 1),
0.0 = math:sinh(0),
1.0 = math:cosh(0),
0.0 = math:tanh(0),
1.0 = math:log2(2),
1.0 = math:log10(10),
-1.0 = math:cos(math:pi()),
1.0 = math:exp(0),
1.0 = math:pow(math:pi(), 0),
0.0 = math:log(1),
0.0 = math:asin(0),
0.0 = math:acos(1),
?OPTIONAL(0.0, math:asinh(0)),
?OPTIONAL(0.0, math:acosh(1)),
?OPTIONAL(0.0, math:atanh(0)),
?OPTIONAL(0.0, math:erf(0)),
?OPTIONAL(1.0, math:erfc(0)),
0.0 = math:tan(id(0)),
0.0 = math:atan2(id(0), 1),
0.0 = math:sinh(id(0)),
1.0 = math:cosh(id(0)),
0.0 = math:tanh(id(0)),
1.0 = math:log2(id(2)),
1.0 = math:log10(id(10)),
1.0 = math:exp(id(0)),
0.0 = math:log(id(1)),
0.0 = math:asin(id(0)),
0.0 = math:acos(id(1)),
?OPTIONAL(0.0, math:asinh(id(0))),
?OPTIONAL(0.0, math:acosh(id(1))),
?OPTIONAL(0.0, math:atanh(id(0))),
?OPTIONAL(0.0, math:erf(id(0))),
?OPTIONAL(1.0, math:erfc(id(0))),
5.0 = math:floor(5.6),
6.0 = math:ceil(5.6),
5.0 = math:floor(id(5.4)),
6.0 = math:ceil(id(5.4)),
0.0 = math:fmod(42, 42),
0.25 = math:fmod(1, 0.75),
-1.0 = math:fmod(-4.0, 1.5),
-0.375 = math:fmod(-3.0, -0.875),
0.125 = math:fmod(8.125, -4),
{'EXIT',{badarith,_}} = (catch math:fmod(5.0, 0.0)),
%% Only for coverage (of beam_type.erl).
{'EXIT',{undef,_}} = (catch math:fnurfla(0)),
{'EXIT',{undef,_}} = (catch math:fnurfla(0, 0)),
{'EXIT',{badarg,_}} = (catch float(kalle)),
{'EXIT',{badarith,_}} = (catch name/1),
ok.
mixed_float_and_int(Config) when is_list(Config) ->
129.0 = pc(77, 23, 5),
ok.
pc(Cov, NotCov, X) ->
round(Cov/(Cov+NotCov)*100) + 42 + 2.0*X.
subtract_number_type(Config) when is_list(Config) ->
120 = fact(5).
fact(N) ->
fact(N, 1).
fact(0, P) -> P;
fact(1, P) -> P;
fact(N, P) -> fact(N-1, P*N).
float_followed_by_guard(Config) when is_list(Config) ->
true = ffbg_1(5, 1),
false = ffbg_1(1, 5),
ok.
ffbg_1(A, B0) ->
%% This is a non-guard block followed by a *guard block* that starts with a
%% floating point operation, and the compiler erroneously assumed that it
%% was safe to skip fcheckerror because the next block started with a float
%% op.
B = id(B0) / 1.0,
if
A - B > 0.0 -> true;
A - B =< 0.0 -> false
end.
id(I) -> I.
