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/* { dg-options "-fcilkplus" } */
/* { dg-do run { target i?86-*-* x86_64-*-* } } */
/* { dg-options "-fcilkplus -lcilkrts" { target { i?86-*-* x86_64-*-* } } } */
#include <cilk/cilk.h>
#include <vector>
#include <random>
template <class T>
void do_not_optimize_away(T&& x) {
asm volatile("" : "+r"(x));
}
const int N = 1'000'000;
auto compute() {
std::vector<double> v(N);
auto rng = std::mt19937{std::random_device{}()};
std::uniform_real_distribution<double> dist(0, 1);
for (int i = 0; i < N; ++i) v[i] = std::log(std::sqrt(dist(rng)));
return v;
}
int main() {
std::vector<double> v1, v2, v3;
cilk_spawn [&] { v1 = compute(); }();
cilk_spawn [&] { v2 = compute(); }();
v3 = compute();
do_not_optimize_away(v1.data());
do_not_optimize_away(v2.data());
do_not_optimize_away(v3.data());
return 0;
}
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