| gst <g.starck@gmail.com>: Mar 26 05:54AM -0700 Le vendredi 17 mars 2023 à 13:21:06 UTC-4, Frederick Virchanza Gotham a écrit : > (1) Simple console program > (2) GUI program using GTK3 (on top of either X11 or Wayland) > (3) GUI program using X11 directly really nice recipe, would be worth having in a github/gitlab/.. repo or gitst and sharing. |
| James Taylor <invalid@invalid.net>: Mar 26 02:30AM +0100 On 25/03/2023 14:14, Bonita Montero wrote: > Show me your results (-std:c++20 / -std=c++20) ! Sure if you can post a program that compiles in VS 2022 - 17.5.3 |
| Bonita Montero <Bonita.Montero@gmail.com>: Mar 26 05:07AM +0200 Am 26.03.2023 um 03:30 schrieb James Taylor: > Sure if you can post a program that compiles in VS 2022 - 17.5.3 It's C++20. Maybe this works : #include <iostream> #include <random> #include <chrono> #include <vector> #include <utility> #include <atomic> using namespace std; using namespace chrono; atomic_uint64_t aSum, aDenom = 3; int main() { constexpr size_t N = 0x400 / sizeof(uint64_t), ROUNDS = 1'000'000; mt19937_64 mt; uniform_int_distribution<uint64_t> uid( (uint64_t)1 << 63, -1 ); vector<uint64_t> counters( N ); for( uint64_t &c : counters ) c = uid( mt ); auto unroll = []<size_t ... Indices, typename Fn>( index_sequence<Indices ...>, Fn fn ) { (fn.template operator ()<Indices>(), ...); }; auto testPar = [&]<size_t Par>( integral_constant<size_t, Par> ) -> double { uint64_t prevs[Par] = { 0 }; auto seq = make_index_sequence<Par>(); auto start = high_resolution_clock::now(); uint64_t denom = ::aDenom.load( memory_order::relaxed ); for( size_t r = ROUNDS; r--; ) for( size_t i = 0; i + Par < N; i += Par ) unroll( seq, [&]<size_t I>() { prevs[I] = (counters[i + I] ^ prevs[I]) % denom; } ); double ns = duration_cast<nanoseconds>( high_resolution_clock::now() - start ).count() / ((double)ROUNDS * N); uint64_t sum = 0; unroll( seq, [&]<size_t I>() { sum += prevs[I]; } ); ::aSum.store( sum, memory_order::relaxed ); return ns; }; unroll( make_index_sequence<4>(), [&]<size_t I>() { cout << I << ": " << testPar( integral_constant<size_t, I + 1>() ) << endl; } ); } |
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