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 -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 }