gcc/testsuite/gcc.dg/cdce2.c

   1 /* { dg-do  run } */
   2 /* { dg-options "-O2 -fdump-tree-dce1-details  -lm" } */
   3 /* { dg-message  "note: function call is shrink-wrapped into error conditions\." "Missing conditional dce" {target "*-*-*"} 15 } */
   4
   5 #include <stdlib.h>
   6 #include <math.h>
   7 #include <errno.h>
   8 #include <stdio.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
  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
  56 }