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 extern void abort (void);
  11
  12 long fff[10];
  13
  14 void f(long a, long b)
  15 {
  16   long crcc = b;
  17   long d = *((long*)(a+1));
  18   int i;
  19
  20   a = d >= b? d:b;
  21
  22
  23   for(i=0;i<10;i++)
  24    fff[i] = a;
  25 }
  26
  27 /* The variable a cannot be a local variable as we get better aliasing
  28    now and decide that the store to a is dead.  The better aliasing comes
  29    from better representation of pointer arithmetic. */
  30 long a = 10;
  31 int main(void)
  32 {
  33   int i;
  34   f((long)(&a)-1,0);
  35   for(i = 0;i<10;i++)
  36    if (fff[i]!=10)
  37     abort ();
  38   return 0;
  39 }
  40