gcc/testsuite/gcc.dg/cdce1.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(int x, double y) __attribute__((noinline));
  11 double foo_opt(int x, double y)
  12 {
  13     double yy = 0;
  14     errno = 0;
  15     yy = pow(x,y);
  16     return 0;
  17 }
  18
  19 double foo(int x, double y) __attribute__((noinline));
  20 double foo(int x, double y)
  21 {
  22     double yy = 0;
  23     errno = 0;
  24     yy = pow(x,y);
  25     return yy;
  26 }
  27
  28 int test(double (*fp)(int x, double y))
  29 {
  30    int i,x;
  31
  32    x = 127;
  33    for (i = 30; i < 300; i++)
  34    {
  35       fp(x,i);
  36       if (errno)
  37          total_err_count ++;
  38    }
  39
  40    x = -300;
  41    for (i = 100; i < 300; i++)
  42    {
  43       fp(x,i);
  44       if (errno)
  45          total_err_count ++;
  46    }
  47
  48    x = 65577;
  49    for (i = 60; i < 200; i++)
  50    {
  51       fp(x,i);
  52       if (errno)
  53          total_err_count ++;
  54    }
  55
  56    x = 65577*127;
  57    for (i = 1; i < 100; i++)
  58    {
  59       fp(x,i);
  60       if (errno)
  61          total_err_count ++;
  62    }
  63
  64    return total_err_count;
  65 }
  66
  67 int main()
  68 {
  69   int en1, en2;
  70   total_err_count = 0;
  71   en1 = test(foo_opt);
  72   total_err_count = 0;
  73   en2 = test(foo);
  74
  75   printf("total number of errors = %d, %d\n", en1, en2);
  76   if (en1 != en2)
  77      abort();
  78
  79   return 0;
  80
  81 }