Merge branch 'hasse/stdlib/base64/OTP-14624'

* hasse/stdlib/base64/OTP-14624:
  stdlib: Add base64 benchmarks
  stdlib: Do not check base64 input more than needed
  stdlib: Minor optimization of base64
  stdlib: Use binary_to_list in base64 when it is faster
  stdlib: Optimize base64 functions

1 files changed, 104 insertions, 3 deletions

diff --git a/lib/stdlib/test/stdlib_bench_SUITE.erl b/lib/stdlib/test/stdlib_bench_SUITE.erl
index 8670e7029c..2a9981bb9e 100644
--- a/lib/stdlib/test/stdlib_bench_SUITE.erl
+++ b/lib/stdlib/test/stdlib_bench_SUITE.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2012-2016. All Rights Reserved.
+%% Copyright Ericsson AB 2012-2017. 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.
@@ -28,13 +28,20 @@ suite() -> [{ct_hooks,[{ts_install_cth,[{nodenames,2}]}]}].
 
 
 all() ->
-    [{group,unicode}].
+    [{group,unicode}, {group,base64}].
 
 groups() ->
     [{unicode,[{repeat,5}],
       [norm_nfc_list, norm_nfc_deep_l, norm_nfc_binary,
        string_lexemes_list, string_lexemes_binary
-      ]}].
+      ]},
+     {base64,[{repeat,5}],
+      [decode_binary, decode_binary_to_string,
+       decode_list, decode_list_to_string,
+       encode_binary, encode_binary_to_string,
+       encode_list, encode_list_to_string,
+       mime_binary_decode, mime_binary_decode_to_string,
+       mime_list_decode, mime_list_decode_to_string]}].
 
 init_per_group(_GroupName, Config) ->
     Config.
@@ -105,3 +112,97 @@ norm_data(Config) ->
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
+decode_binary(_Config) ->
+    test(decode, encoded_binary()).
+
+decode_binary_to_string(_Config) ->
+    test(decode_to_string, encoded_binary()).
+
+decode_list(_Config) ->
+    test(decode, encoded_list()).
+
+decode_list_to_string(_Config) ->
+    test(decode_to_string, encoded_list()).
+
+encode_binary(_Config) ->
+    test(encode, binary()).
+
+encode_binary_to_string(_Config) ->
+    test(encode_to_string, binary()).
+
+encode_list(_Config) ->
+    test(encode, list()).
+
+encode_list_to_string(_Config) ->
+    test(encode_to_string, list()).
+
+mime_binary_decode(_Config) ->
+    test(mime_decode, encoded_binary()).
+
+mime_binary_decode_to_string(_Config) ->
+    test(mime_decode_to_string, encoded_binary()).
+
+mime_list_decode(_Config) ->
+    test(mime_decode, encoded_list()).
+
+mime_list_decode_to_string(_Config) ->
+    test(mime_decode_to_string, encoded_list()).
+
+-define(SIZE, 10000).
+-define(N, 1000).
+
+encoded_binary() ->
+    list_to_binary(encoded_list()).
+
+encoded_list() ->
+    L = random_byte_list(round(?SIZE*0.75)),
+    base64:encode_to_string(L).
+
+binary() ->
+    list_to_binary(list()).
+
+list() ->
+    random_byte_list(?SIZE).
+
+test(Func, Data) ->
+    F = fun() -> loop(?N, Func, Data) end,
+    {Time, ok} = timer:tc(fun() -> lspawn(F) end),
+    report_base64(Time).
+
+loop(0, _F, _D) -> garbage_collect(), ok;
+loop(N, F, D) ->
+    _ = base64:F(D),
+    loop(N - 1, F, D).
+
+lspawn(Fun) ->
+    {Pid, Ref} = spawn_monitor(fun() -> exit(Fun()) end),
+    receive
+        {'DOWN', Ref, process, Pid, Rep} -> Rep
+    end.
+
+report_base64(Time) ->
+    Tps = round((?N*1000000)/Time),
+    ct_event:notify(#event{name = benchmark_data,
+                           data = [{suite, "stdlib_base64"},
+                                   {value, Tps}]}),
+    Tps.
+
+%% Copied from base64_SUITE.erl.
+
+random_byte_list(N) ->
+    random_byte_list(N, []).
+
+random_byte_list(0, Acc) ->
+    Acc;
+random_byte_list(N, Acc) ->
+    random_byte_list(N-1, [rand:uniform(255)|Acc]).
+
+make_big_binary(N) ->
+    list_to_binary(mbb(N, [])).
+
+mbb(N, Acc) when N > 256 ->
+    B = list_to_binary(lists:seq(0, 255)),
+    mbb(N - 256, [B | Acc]);
+mbb(N, Acc) ->
+    B = list_to_binary(lists:seq(0, N-1)),
+    lists:reverse(Acc, B).