diff options
Diffstat (limited to 'erts/emulator/test/hash_SUITE.erl')
| -rw-r--r-- | erts/emulator/test/hash_SUITE.erl | 48 |
1 files changed, 37 insertions, 11 deletions
diff --git a/erts/emulator/test/hash_SUITE.erl b/erts/emulator/test/hash_SUITE.erl index 647bb45049..2ea49467b8 100644 --- a/erts/emulator/test/hash_SUITE.erl +++ b/erts/emulator/test/hash_SUITE.erl @@ -3,16 +3,17 @@ %% %% Copyright Ericsson AB 2000-2013. 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% %% @@ -73,6 +74,7 @@ config(priv_dir,_) -> init_per_group/2,end_per_group/2, test_basic/1,test_cmp/1,test_range/1,test_spread/1, test_phash2/1,otp_5292/1,bit_level_binaries/1,otp_7127/1, + test_hash_zero/1, end_per_testcase/2,init_per_testcase/2]). init_per_testcase(_Case, Config) -> Dog=test_server:timetrap(test_server:minutes(10)), @@ -86,7 +88,9 @@ suite() -> [{ct_hooks,[ts_install_cth]}]. all() -> [test_basic, test_cmp, test_range, test_spread, - test_phash2, otp_5292, bit_level_binaries, otp_7127]. + test_phash2, otp_5292, bit_level_binaries, otp_7127, + test_hash_zero + ]. groups() -> []. @@ -160,6 +164,8 @@ otp_7127(doc) -> otp_7127(Config) when is_list(Config) -> otp_7127_test(). +test_hash_zero(Config) when is_list(Config) -> + hash_zero_test(). -endif. @@ -591,6 +597,26 @@ otp_7127_test() -> 38990304 = erlang:phash2(<<"Scott9">>), ok. +hash_zero_test() -> + Zs = [0.0, -0.0, 0/-1, 0.0/-1, 0/-(1 bsl 65), + binary_to_term(<<131,70,0,0,0,0,0,0,0,0>>), %% +0.0 + binary_to_term(<<131,70,128,0,0,0,0,0,0,0>>)], %% -0.0 + ok = hash_zero_test(Zs,fun(T) -> erlang:phash2(T, 1 bsl 32) end), + ok = hash_zero_test(Zs,fun(T) -> erlang:phash(T, 1 bsl 32) end), + ok = hash_zero_test(Zs,fun(T) -> erlang:hash(T, (1 bsl 27) - 1) end), + ok. + +hash_zero_test([Z|Zs],F) -> + hash_zero_test(Zs,Z,F(Z),F). +hash_zero_test([Z|Zs],Z0,V,F) -> + true = Z0 =:= Z, %% assert exact equal + Z0 = Z, %% assert matching + V = F(Z), %% assert hash + hash_zero_test(Zs,Z0,V,F); +hash_zero_test([],_,_,_) -> + ok. + + %% %% Reference implementation of integer hashing %% |