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Counting Instructions
=====================
Here is an example that shows how to count how many times each
instruction is executed:
$ (cd erts/emulator && make icount)
MAKE icount
make[1]: Entering directory `/home/uabbgus/otp/erts/emulator'
.
.
.
make[1]: Leaving directory `/home/uabbgus/otp/erts/emulator'
$ cat t.erl
-module(t).
-compile([export_all,nowarn_export_all]).
count() ->
erts_debug:ic(fun benchmark/0).
benchmark() ->
%% Run dialyzer.
Root = code:root_dir(),
Wc1 = filename:join(Root, "lib/{kernel,stdlib}/ebin/*.beam"),
Wc2 = filename:join(Root, "erts/preloaded/ebin/*.beam"),
Files = filelib:wildcard(Wc1) ++ filelib:wildcard(Wc2),
Opts = [{analysis_type,plt_build},{files,Files},{get_warnings,true}],
dialyzer:run(Opts).
$ $ERL_TOP/bin/cerl -icount
Erlang/OTP 22 [RELEASE CANDIDATE 1] [erts-10.2.4] [source-ac0d451] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:1] [hipe] [instruction-counting]
Eshell V10.2.4 (abort with ^G)
1> c(t).
{ok,t}
2> t:count().
0 badarg_j
0 badmatch_x
0 bs_add_jsstx
0 bs_context_to_binary_x
.
.
.
536461394 move_call_last_yfQ
552405176 allocate_tt
619920327 i_is_eq_exact_immed_frc
636419163 is_nonempty_list_allocate_frtt
641859278 i_get_tuple_element_xPx
678196718 move_return_c
786289914 is_tagged_tuple_frAa
865826424 i_call_f
Total: 20728870321
[]
3>
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