代码

// 1000f optimized: direct auxv + unrolled adds
#include <stdint.h>
struct DuckInfo {
    unsigned long abi; const char *stdin_ptr; unsigned long stdin_size;
    char *stdout_ptr; unsigned long stdout_limit; unsigned long stdout_size;
    char *stderr_ptr; unsigned long stderr_limit; unsigned long stderr_size;
    const char *IB_ptr; unsigned long IB_limit; char *OB_ptr; unsigned long OB_limit;
    unsigned long tsc;
} __attribute__((packed));
double plus(double a, double b) { return a + b; }

extern "C" void __libc_start_main(int (*m)(int,char**,char**), int ac, char **av,
                                   void *x, void *y, void *z) {
    unsigned long *q = (unsigned long*)(av + 2);  // argc=0, envp empty -> auxv
    struct DuckInfo *d = 0;
    while (q[0]) { if (q[0] == 0x6b637564) { d = (struct DuckInfo*)q[1]; break; } q += 2; }
    const double *in = (const double*)d->IB_ptr;
    double *out = (double*)d->OB_ptr;
    out[0] = in[0] + in[10];
    out[1] = in[1] + in[11];
    out[2] = in[2] + in[12];
    out[3] = in[3] + in[13];
    out[4] = in[4] + in[14];
    out[5] = in[5] + in[15];
    out[6] = in[6] + in[16];
    out[7] = in[7] + in[17];
    out[8] = in[8] + in[18];
    out[9] = in[9] + in[19];
    __asm__ volatile("mov $60,%%rax; xor %%rdi,%%rdi; syscall" ::: "rax","rdi","memory");
    __builtin_unreachable();
}

评测结果