modernc.org/cc@v1.0.1/testdata/gcc-6.3.0/gcc/testsuite/gcc.c-torture/compile/940718-1.c (about)

     1  extern double log (double) __attribute__ ((const));
     2  
     3  f (double x)
     4  {
     5    for (;;)
     6      exp(log(x));
     7  }