source: benchmark/basic/fetch_add.c @ 73f1b1c

#include <stdio.h>

#include "bench.h"

// Does a "lock add" on entry and a "lock sub" on exit => 2 atomic instructions making it the most expensive
// atomic test.

volatile int value;

void __attribute__((noinline)) do_call() {
        __atomic_add_fetch( &value, 1, __ATOMIC_SEQ_CST );
        asm volatile ("");
        __atomic_sub_fetch( &value, 1, __ATOMIC_SEQ_CST );
}

int main( int argc, char * argv[] ) {
        BENCH_START()
        BENCH(
                for (size_t i = 0; i < times; i++) {
                        do_call();
                },
                result
        )
        printf( "%g\n", result );
}

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