gcc/testsuite/gcc.dg/cdce1.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -fmath-errno -fdump-tree-cdce-details -fdump-tree-optimized -lm" } */
   3 /* { dg-require-effective-target int32plus } */
   4 /* { dg-require-effective-target large_double } */
   5 /* { dg-final { scan-tree-dump "cdce1.c:17: \[^\n\r]* function call is shrink-wrapped into error conditions\." "cdce" } } */
   6 /* { dg-final { scan-tree-dump "pow \\(\[^\n\r]*\\); \\\[tail call\\\]" "optimized" } } */
   7
   8 #include <stdlib.h>
   9 #include <math.h>
  10 #include <errno.h>
  11 int total_err_count = 0;
  12 double foo_opt (int x, double y) __attribute__((noinline));
  13 double foo_opt (int x, double y)
  14 {
  15   double yy = 0;
  16   errno = 0;
  17   yy = pow (x, y * y);
  18   return 0;
  19 }
  20
  21 double foo (int x, double y) __attribute__((noinline));
  22 double foo (int x, double y)
  23 {
  24   double yy = 0;
  25   errno = 0;
  26   yy = pow (x, y * y);
  27   return yy;
  28 }
  29
  30 int test (double (*fp)(int x, double y))
  31 {
  32   int i,x;
  33
  34   x = 127;
  35   for (i = 30; i < 300; i++)
  36     {
  37       fp (x, i);
  38       if (errno)
  39         total_err_count ++;
  40     }
  41
  42   x = -300;
  43   for (i = 100; i < 300; i++)
  44     {
  45       fp (x, i);
  46       if (errno)
  47         total_err_count ++;
  48     }
  49
  50    x = 65577;
  51    for (i = 60; i < 200; i++)
  52      {
  53        fp (x, i);
  54        if (errno)
  55          total_err_count ++;
  56      }
  57
  58    x = 65577 * 127;
  59    for (i = 1; i < 100; i++)
  60      {
  61        fp (x, i);
  62        if (errno)
  63          total_err_count ++;
  64      }
  65
  66    return total_err_count;
  67 }
  68
  69 int main ()
  70 {
  71   int en1, en2;
  72   total_err_count = 0;
  73   en1 = test (foo_opt);
  74   total_err_count = 0;
  75   en2 = test (foo);
  76
  77   if (en1 != en2)
  78     abort ();
  79
  80   return 0;
  81 }