diff options
Diffstat (limited to 'erts/emulator/test/big_SUITE.erl')
| -rw-r--r-- | erts/emulator/test/big_SUITE.erl | 88 |
1 files changed, 76 insertions, 12 deletions
diff --git a/erts/emulator/test/big_SUITE.erl b/erts/emulator/test/big_SUITE.erl index 413bd3bcae..e17a80a52c 100644 --- a/erts/emulator/test/big_SUITE.erl +++ b/erts/emulator/test/big_SUITE.erl @@ -3,16 +3,17 @@ %% %% Copyright Ericsson AB 1997-2011. All Rights Reserved. %% -%% The contents of this file are subject to the Erlang Public License, -%% Version 1.1, (the "License"); you may not use this file except in -%% compliance with the License. You should have received a copy of the -%% Erlang Public License along with this software. If not, it can be -%% retrieved online at http://www.erlang.org/. -%% -%% Software distributed under the License is distributed on an "AS IS" -%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See -%% the License for the specific language governing rights and limitations -%% under the License. +%% 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% %% @@ -23,7 +24,8 @@ init_per_group/2,end_per_group/2]). -export([t_div/1, eq_28/1, eq_32/1, eq_big/1, eq_math/1, big_literals/1, borders/1, negative/1, big_float_1/1, big_float_2/1, - shift_limit_1/1, powmod/1, system_limit/1, otp_6692/1]). + bxor_2pow/1, + shift_limit_1/1, powmod/1, system_limit/1, toobig/1, otp_6692/1]). %% Internal exports. -export([eval/1]). @@ -40,7 +42,8 @@ suite() -> [{ct_hooks,[ts_install_cth]}]. all() -> [t_div, eq_28, eq_32, eq_big, eq_math, big_literals, borders, negative, {group, big_float}, shift_limit_1, - powmod, system_limit, otp_6692]. + bxor_2pow, + powmod, system_limit, toobig, otp_6692]. groups() -> [{big_float, [], [big_float_1, big_float_2]}]. @@ -370,6 +373,16 @@ maxbig() -> id(I) -> I. +toobig(Config) when is_list(Config) -> + ?line {'EXIT',{{badmatch,_},_}} = (catch toobig()), + ok. + +toobig() -> + A = erlang:term_to_binary(lists:seq(1000000, 2200000)), + ASize = erlang:bit_size(A), + <<ANr:ASize>> = A, % should fail + ANr band ANr. + otp_6692(suite) -> []; otp_6692(doc) -> @@ -413,3 +426,54 @@ loop2(X,Y,N,M) -> end, loop2(X,Y,N+1,M). + +%% ERL-450 +bxor_2pow(_Config) -> + IL = lists:seq(8*3, 8*16, 4), + JL = lists:seq(0, 64), + [bxor_2pow_1((1 bsl I), (1 bsl J)) + || I <- IL, J <- JL], + ok. + +bxor_2pow_1(A, B) -> + for(-1,1, fun(Ad) -> + for(-1,1, fun(Bd) -> + bxor_2pow_2(A+Ad, B+Bd), + bxor_2pow_2(-A+Ad, B+Bd), + bxor_2pow_2(A+Ad, -B+Bd), + bxor_2pow_2(-A+Ad, -B+Bd) + end) + end). + +for(From, To, _Fun) when From > To -> + ok; +for(From, To, Fun) -> + Fun(From), + for(From+1, To, Fun). + +bxor_2pow_2(A, B) -> + Correct = my_bxor(A, B), + case A bxor B of + Correct -> ok; + Wrong -> + io:format("~.16b bxor ~.16b\n", [A,B]), + io:format("Expected ~.16b\n", [Correct]), + io:format("Got ~.16b\n", [Wrong]), + ct:fail({failed, 'bxor'}) + + end. + +%% Implement bxor without bxor +my_bxor(A, B) -> + my_bxor(A, B, 0, 0). + +my_bxor(0, 0, _, Acc) -> Acc; +my_bxor(-1, -1, _, Acc) -> Acc; +my_bxor(-1, 0, N, Acc) -> (-1 bsl N) bor Acc; % sign extension +my_bxor(0, -1, N, Acc) -> (-1 bsl N) bor Acc; % sign extension +my_bxor(A, B, N, Acc0) -> + Acc1 = case (A band 1) =:= (B band 1) of + true -> Acc0; + false -> Acc0 bor (1 bsl N) + end, + my_bxor(A bsr 1, B bsr 1, N+1, Acc1). |