1  /* { dg-do run } */
       2  /* { dg-skip-if "doubles are floats" { "avr-*-*" } } */
       3  /* { dg-options "-O2 -fmath-errno -fdump-tree-cdce-details -fdump-tree-optimized -lm" } */
       4  /* { dg-final { scan-tree-dump "cdce2.c:16: \[^\n\r]* function call is shrink-wrapped into error conditions\." "cdce" } } */
       5  /* { dg-final { scan-tree-dump "log \\(\[^\n\r]*\\); \\\[tail call\\\]" "optimized" } } */
       6   
       7  #include <stdlib.h>
       8  #include <math.h>
       9  #include <errno.h>
      10  int total_err_count = 0;
      11  double foo_opt (double y) __attribute__((noinline));
      12  double foo_opt (double y)
      13  {
      14    double yy = 0;
      15    errno = 0;
      16    yy = log (y);
      17    return 0;
      18  }
      19  
      20  double foo (double y) __attribute__((noinline));
      21  double foo (double y)
      22  {
      23    double yy = 0;
      24    errno = 0;
      25    yy = log (y);
      26    return yy;
      27  }
      28  
      29  int test (double (*fp) (double y))
      30  {
      31    int i,x;
      32    for (i = -100; i < 100; i++)
      33      {  
      34        fp (i);
      35        if (errno)
      36          total_err_count ++;
      37      }
      38  
      39    return total_err_count;
      40  }
      41  
      42  int main ()
      43  {
      44    int en1, en2;
      45    double yy;
      46    total_err_count = 0;
      47    en1 = test (foo_opt);
      48    total_err_count = 0;
      49    en2 = test (foo);
      50  
      51    if (en1 != en2)
      52      abort();
      53  
      54    return 0;
      55  }