gcc/testsuite/gcc.c-torture/execute/pr40657.c

   1 /* Verify that that Thumb-1 epilogue size optimization does not clobber the
   2    return value.  */
   3
   4 long long v = 0x123456789abc;
   5
   6 __attribute__((noinline)) void bar (int *x)
   7 {
   8   asm volatile ("" : "=m" (x) ::);
   9 }
  10
  11 __attribute__((noinline)) long long foo()
  12 {
  13   int x;
  14   bar(&x);
  15   return v;
  16 }
  17
  18 int main ()
  19 {
  20   if (foo () != v)
  21     abort ();
  22   exit (0);
  23 }