tests/tests2/88_codeopt.c

   1 /* Check some way in where code suppression caused various
   2    miscompilations.  */
   3 extern int printf (const char *, ...);
   4 typedef unsigned long size_t;
   5
   6 size_t _brk_start, _brk_end;
   7 void * extend_brk(size_t size, size_t align)
   8 {
   9     size_t mask = align - 1;
  10     void *ret = 0;
  11
  12      do {
  13          if (__builtin_expect(!!(_brk_start == 0), 0))
  14            do {
  15                printf("wrong1\n");
  16            } while (0);
  17      } while (0);
  18      _brk_end = (_brk_end + mask) & ~mask;
  19      ret = (void *)_brk_end;
  20      _brk_end += size;
  21
  22      return ret;
  23 }
  24
  25 static void get_args (int a, int b)
  26 {
  27   if (a != 1)
  28     printf("wrong2\n");
  29   else
  30     printf("okay\n");
  31 }
  32
  33 void bla(void)
  34 {
  35   int __ret = 42;
  36   ({
  37     if (__builtin_expect(!!(0), 0)) {
  38       if (__builtin_expect(!!__ret, 0))
  39         printf("wrong3\n");
  40       int x = !!(__ret);
  41     }
  42     __ret;
  43   });
  44   get_args(!!__ret, sizeof(__ret));
  45 }
  46
  47 _Bool chk(unsigned long addr, unsigned long limit, unsigned long size)
  48 {
  49   _Bool ret;
  50   /* This just needs to compile, no runtime test.  (And it doesn't compile
  51      only with certain internal checking added that's not committed).  */
  52   if (0)
  53     ret = 0 != (!!(addr > limit - size));
  54 }
  55
  56 int main()
  57 {
  58   void *r;
  59   _brk_start = 1024;
  60   _brk_end = 1024;
  61   r = extend_brk (4096, 16);
  62   if (!r)
  63     printf("wrong4\n");
  64   else
  65     printf("okay\n");
  66   bla();
  67   return 0;
  68 }