abd0d8d355
It removes the situation when compiler is optimizing out std::max_element() call entirely because its result is never used.
44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
//---------------------------------------------------------------------------//
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// Copyright (c) 2013-2014 Rastko Anicic <anicic.rastko@gmail.com>
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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// See http://boostorg.github.com/compute for more information.
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//---------------------------------------------------------------------------//
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#include <algorithm>
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#include <iostream>
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#include <vector>
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#include "perf.hpp"
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int rand_int()
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{
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return static_cast<int>(rand() % 10000000);
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}
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int main(int argc, char *argv[])
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{
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perf_parse_args(argc, argv);
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std::cout << "size: " << PERF_N << std::endl;
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// create vector of random numbers on the host
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std::vector<int> host_vector(PERF_N);
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std::generate(host_vector.begin(), host_vector.end(), rand_int);
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int max = 0;
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perf_timer t;
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for(size_t trial = 0; trial < PERF_TRIALS; trial++){
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t.start();
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max = *(std::max_element(host_vector.begin(), host_vector.end()));
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t.stop();
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}
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std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
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std::cout << "max: " << max << std::endl;
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return 0;
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}
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