modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/pr82954.c (about)

     1  /* PR tree-optimization/82954 */
     2  
     3  __attribute__((noipa)) void
     4  foo (int *__restrict p, int *__restrict q)
     5  {
     6    p[0] = p[0] ^ 1;
     7    p[1] = p[1] ^ 2;
     8    p[2] = p[2] ^ q[2];
     9    p[3] = p[3] ^ q[3];
    10  }
    11  
    12  int
    13  main ()
    14  {
    15    int p[4] = { 16, 32, 64, 128 };
    16    int q[4] = { 8, 4, 2, 1 };
    17    asm volatile ("" : : "g" (p), "g" (q) : "memory");
    18    foo (p, q);
    19    if (p[0] != 17 || p[1] != 34 || p[2] != 66 || p[3] != 129)
    20      __builtin_abort ();
    21    return 0;
    22  }