gcc/testsuite/gcc.dg/cdce1.c

   1 /* { dg-do  run  } */
   2 /* { dg-options "-O2 -fmath-errno -fdump-tree-cdce-details  -lm" } */
   3 /* { dg-final { scan-tree-dump  "cdce1.c:16: note: function call is shrink-wrapped into error conditions\."  "cdce" } } */
   4 /* { dg-final { cleanup-tree-dump "cdce" } } */
   5 /* { dg-require-effective-target large_double } */
   6
   7 #include <stdlib.h>
   8 #include <math.h>
   9 #include <errno.h>
  10 int total_err_count = 0;
  11 double foo_opt (int x, double y) __attribute__((noinline));
  12 double foo_opt (int x, double y)
  13 {
  14   double yy = 0;
  15   errno = 0;
  16   yy = pow (x, y * y);
  17   return 0;
  18 }
  19
  20 double foo (int x, double y) __attribute__((noinline));
  21 double foo (int x, double y)
  22 {
  23   double yy = 0;
  24   errno = 0;
  25   yy = pow (x, y * y);
  26   return yy;
  27 }
  28
  29 int test (double (*fp)(int x, double y))
  30 {
  31   int i,x;
  32
  33   x = 127;
  34   for (i = 30; i < 300; i++)
  35     {
  36       fp (x, i);
  37       if (errno)
  38         total_err_count ++;
  39     }
  40
  41   x = -300;
  42   for (i = 100; i < 300; i++)
  43     {
  44       fp (x, i);
  45       if (errno)
  46         total_err_count ++;
  47     }
  48
  49    x = 65577;
  50    for (i = 60; i < 200; i++)
  51      {
  52        fp (x, i);
  53        if (errno)
  54          total_err_count ++;
  55      }
  56
  57    x = 65577 * 127;
  58    for (i = 1; i < 100; i++)
  59      {
  60        fp (x, i);
  61        if (errno)
  62          total_err_count ++;
  63      }
  64
  65    return total_err_count;
  66 }
  67
  68 int main ()
  69 {
  70   int en1, en2;
  71   total_err_count = 0;
  72   en1 = test (foo_opt);
  73   total_err_count = 0;
  74   en2 = test (foo);
  75
  76   if (en1 != en2)
  77     abort ();
  78
  79   return 0;
  80 }