gcc/testsuite/gcc.dg/cdce2.c

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