gcc/testsuite/gcc.dg/max-1.c

   1 /* PR middle-end/18548 */
   2 /* Test case reduced by Andrew Pinski <pinskia@physics.uc.edu> */
   3 /* { dg-do run } */
   4 /* { dg-options "-O1 " } */
   5 /* Option -fno-tree-lrs removed By Andrew MacLeod since it is no longer
   6    supported in the compiler beginning with GCC 4.3.  */
   7 /* m32c has varying sized pointers */
   8 /* { dg-skip-if "" { "m32c-*-*" } { "*" } { "-mcpu=m32c" "-mcpu=m32cm" } } */
   9
  10 /* Kludge to make it signed. */
  11 #define unsigned signed
  12 __extension__ typedef __SIZE_TYPE__ ssize_t;
  13 #undef unsigned
  14
  15 extern void abort (void);
  16
  17 ssize_t fff[10];
  18
  19 void f(ssize_t a, ssize_t b)
  20 {
  21   ssize_t crcc = b;
  22   ssize_t d = *((ssize_t*)(a+1));
  23   int i;
  24
  25   a = d >= b? d:b;
  26
  27
  28   for(i=0;i<10;i++)
  29    fff[i] = a;
  30 }
  31
  32 /* The variable a cannot be a local variable as we get better aliasing
  33    now and decide that the store to a is dead.  The better aliasing comes
  34    from better representation of pointer arithmetic. */
  35 ssize_t a = 10;
  36 int main(void)
  37 {
  38   int i;
  39   f((ssize_t)(&a)-1,0);
  40   for(i = 0;i<10;i++)
  41    if (fff[i]!=10)
  42     abort ();
  43   return 0;
  44 }
  45