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mercury/benchmarks/progs/integer_to_string/uint64_conversion.m
Julien Fischer 49c4dff4bd Add more integer to string benchmarks. 
benchmarks/progs/integer_to_string/uint32_conversion.m:
benchmarks/progs/integer_to_string/uint64_conversion.m:
     As above.
2021-12-06 00:42:53 +11:00

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9.9 KiB
Mathematica
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%---------------------------------------------------------------------------%
% vim: ft=mercury ts=4 sw=4 et
%---------------------------------------------------------------------------%
:- module uint64_conversion.
:- interface.
:- import_module io.
:- pred main(io::di, io::uo) is cc_multi.
%---------------------------------------------------------------------------%
%---------------------------------------------------------------------------%
:- implementation.
:- import_module array.
:- import_module benchmarking.
:- import_module float.
:- import_module list.
:- import_module maybe.
:- import_module random.
:- import_module random.sfc64.
:- import_module random.system_rng.
:- import_module require.
:- import_module string.
:- import_module uint64.
:- import_module unit.
%---------------------------------------------------------------------------%
main(!IO) :-
NumRepeats = 100,
NumElements = 10_000_000,
io.format("n = %d; repeats = %d, grade = %s\n",
[i(NumElements), i(NumRepeats), s($grade)], !IO),
randomly_fill_array(NumElements, Array, SeedA, SeedB, SeedC, !IO),
io.format("seed: a = %u, b = %u, c = %u\n",
[u64(SeedA), u64(SeedB), u64(SeedC)], !IO),
benchmark_det_io(run_test(std_uint64_to_string), Array, _, !IO,
NumRepeats, TimeStd),
io.format(" Std: %dms\n", [i(TimeStd)], !IO),
benchmark_det_io(run_test(alt1_uint64_to_string), Array, _, !IO,
NumRepeats, TimeAlt1),
io.format("Alt1: %dms ratio: %.2f\n",
[i(TimeAlt1), f(float(TimeStd) / float(TimeAlt1))], !IO),
benchmark_det_io(run_test(alt2_uint64_to_string), Array, _, !IO,
NumRepeats, TimeAlt2),
io.format("Alt2: %dms ratio: %.2f\n",
[i(TimeAlt2), f(float(TimeStd) / float(TimeAlt2))], !IO),
benchmark_det_io(run_test(alt3_uint64_to_string), Array, _, !IO,
NumRepeats, TimeAlt3),
io.format("Alt3: %dms ratio: %.2f\n",
[i(TimeAlt3), f(float(TimeStd) / float(TimeAlt3))], !IO).
%---------------------------------------------------------------------------%
:- pred randomly_fill_array(int::in, array(uint64)::array_uo,
uint64::out, uint64::out, uint64::out, io::di, io::uo) is det.
randomly_fill_array(Size, Array, A, B, C, !IO) :-
open_system_rng(MaybeSysRNG, !IO),
(
MaybeSysRNG = ok(SysRNG)
;
MaybeSysRNG = error(Error),
error(string(Error))
),
system_rng.generate_uint64(SysRNG, A, !IO),
system_rng.generate_uint64(SysRNG, B, !IO),
system_rng.generate_uint64(SysRNG, C, !IO),
close_system_rng(SysRNG, !IO),
sfc64.seed(A, B, C, Params, State0),
array.generate_foldl(Size, generate_int(Params), Array, State0, _State).
:- pred generate_int(sfc64.params::in, int::in, uint64::out,
sfc64.ustate::di, sfc64.ustate::uo) is det.
generate_int(Params, _I, N, !State) :-
random.generate_uint64(Params, N, !State).
%---------------------------------------------------------------------------%
:- pred run_test((func(uint64) = string)::in(func(in) = uo is det),
array(uint64)::in, unit::out, io::di, io::uo) is det.
run_test(Func, Array, unit, !IO) :-
array.foldl(do_test(Func), Array, !IO).
%---------------------------------------------------------------------------%
:- pred do_test((func(uint64) = string)::in(func(in) = uo is det),
uint64::in, io::di, io::uo) is det.
do_test(Func, N, !IO) :-
S = Func(N),
consume_string(S, !IO).
%---------------------------------------------------------------------------%
:- pragma no_inline(pred(consume_string/3)).
:- pred consume_string(string::in, io::di, io::uo) is det.
:- pragma foreign_proc("C",
consume_string(S::in, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe],
"
// S
").
:- pragma foreign_proc("C#",
consume_string(S::in, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe],
"
// S
").
:- pragma foreign_proc("Java",
consume_string(S::in, _IO0::di, _IO::uo),
[will_not_call_mercury, promise_pure, thread_safe],
"
// S
").
%---------------------------------------------------------------------------%
%
% Std implementation using sprintf().
%
:- func std_uint64_to_string(uint64::in) = (string::uo) is det.
:- pragma foreign_proc("C",
std_uint64_to_string(U64::in) = (S::uo),
[will_not_call_mercury, promise_pure, thread_safe, will_not_modify_trail],
"
char buffer[21]; // 20 for digits, 1 for nul.
sprintf(buffer, ""%"" PRIu64, U64);
MR_allocate_aligned_string_msg(S, strlen(buffer), MR_ALLOC_ID);
strcpy(S, buffer);
").
%---------------------------------------------------------------------------%
:- func alt1_uint64_to_string(uint64::in) = (string::uo) is det.
:- pragma foreign_proc("C",
alt1_uint64_to_string(U::in) = (S::uo),
[will_not_call_mercury, promise_pure, thread_safe, will_not_modify_trail],
"
int num_digits;
if (U < UINT64_C(10)) {
num_digits = 1;
} else if (U < UINT64_C(100)) {
num_digits = 2;
} else if (U < UINT64_C(1000)) {
num_digits = 3;
} else if (U < UINT64_C(10000)) {
num_digits = 4;
} else if (U < UINT64_C(100000)) {
num_digits = 5;
} else if (U < UINT64_C(1000000)) {
num_digits = 6;
} else if (U < UINT64_C(10000000)) {
num_digits = 7;
} else if (U < UINT64_C(100000000)) {
num_digits = 8;
} else if (U < UINT64_C(1000000000)) {
num_digits = 9;
} else if (U < UINT64_C(10000000000)) {
num_digits = 10;
} else if (U < UINT64_C(100000000000)) {
num_digits = 11;
} else if (U < UINT64_C(1000000000000)) {
num_digits = 12;
} else if (U < UINT64_C(10000000000000)) {
num_digits = 13;
} else if (U < UINT64_C(100000000000000)) {
num_digits = 14;
} else if (U < UINT64_C(1000000000000000)) {
num_digits = 15;
} else if (U < UINT64_C(10000000000000000)) {
num_digits = 16;
} else if (U < UINT64_C(100000000000000000)) {
num_digits = 17;
} else if (U < UINT64_C(1000000000000000000)) {
num_digits = 18;
} else if (U < UINT64_C(10000000000000000000)) {
num_digits = 19;
} else {
num_digits = 20;
}
MR_allocate_aligned_string_msg(S, num_digits, MR_ALLOC_ID);
int i = num_digits;
S[i] = '\\0';
i--;
do {
S[i] = \"0123456789\"[U % 10];
i--;
} while ( U /= 10 );
").
%---------------------------------------------------------------------------%
% Same as alt1 except it uses Andrei Alexandrescu's digit counting method.
% See: <https://www.facebook.com/notes/10158791579037200/>
% This is biased in favour of small numbers, it doesn't really help for
% this benchmark.
%
:- func alt2_uint64_to_string(uint64::in) = (string::uo) is det.
:- pragma foreign_proc("C",
alt2_uint64_to_string(U::in) = (S::uo),
[will_not_call_mercury, promise_pure, thread_safe, will_not_modify_trail],
"
uint64_t v = U;
int num_digits = 1;
for (;;) {
if (v < 10) { break; }
if (v < 100) { num_digits += 1; break; }
if (v < 1000) { num_digits += 2; break; }
if (v < 10000) { num_digits += 3; break; }
v /= UINT64_C(10000);
num_digits += 4;
}
MR_allocate_aligned_string_msg(S, num_digits, MR_ALLOC_ID);
int i = num_digits;
S[i] = '\\0';
i--;
do {
S[i] = \"0123456789\"[U % 10];
i--;
} while ( U /= 10 );
").
%---------------------------------------------------------------------------%
% Lookup pairs of digits every iteration.
:- func alt3_uint64_to_string(uint64::in) = (string::uo) is det.
:- pragma foreign_proc("C",
alt3_uint64_to_string(U::in) = (S::uo),
[will_not_call_mercury, promise_pure, thread_safe, will_not_modify_trail],
"
int num_digits;
if (U < UINT64_C(10)) {
num_digits = 1;
} else if (U < UINT64_C(100)) {
num_digits = 2;
} else if (U < UINT64_C(1000)) {
num_digits = 3;
} else if (U < UINT64_C(10000)) {
num_digits = 4;
} else if (U < UINT64_C(100000)) {
num_digits = 5;
} else if (U < UINT64_C(1000000)) {
num_digits = 6;
} else if (U < UINT64_C(10000000)) {
num_digits = 7;
} else if (U < UINT64_C(100000000)) {
num_digits = 8;
} else if (U < UINT64_C(1000000000)) {
num_digits = 9;
} else if (U < UINT64_C(10000000000)) {
num_digits = 10;
} else if (U < UINT64_C(100000000000)) {
num_digits = 11;
} else if (U < UINT64_C(1000000000000)) {
num_digits = 12;
} else if (U < UINT64_C(10000000000000)) {
num_digits = 13;
} else if (U < UINT64_C(100000000000000)) {
num_digits = 14;
} else if (U < UINT64_C(1000000000000000)) {
num_digits = 15;
} else if (U < UINT64_C(10000000000000000)) {
num_digits = 16;
} else if (U < UINT64_C(100000000000000000)) {
num_digits = 17;
} else if (U < UINT64_C(1000000000000000000)) {
num_digits = 18;
} else if (U < UINT64_C(10000000000000000000)) {
num_digits = 19;
} else {
num_digits = 20;
}
static const char digits[201] =
\"0001020304050607080910111213141516171819\"
\"2021222324252627282930313233343536373839\"
\"4041424344454647484950515253545556575859\"
\"6061626364656667686970717273747576777879\"
\"8081828384858687888990919293949596979899\";
MR_allocate_aligned_string_msg(S, num_digits, MR_ALLOC_ID);
S[num_digits] = '\\0';
int next = num_digits - 1;
while (U >= 100) {
int i = (U % 100) * 2;
U /= 100;
S[next] = digits[i + 1];
S[next - 1] = digits[i];
next -= 2;
}
if (U < 10) {
S[next] = '0' + U;
} else {
int i = U * 2;
S[next] = digits[i + 1];
S[next - 1] = digits[i];
}
").
%---------------------------------------------------------------------------%
:- end_module uint64_conversion.
%---------------------------------------------------------------------------%
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