gcc/testsuite/gcc.target/arm/pr48863.c

   1 /* PR target/48863.  */
   2 /* { dg-do run } */
   3 /* { dg-options "-O2" } */
   4
   5 /* Check that Temporary Expression Replacement does not move a
   6   libcall-producing expression across a statement initialising a local
   7   register variable.  */
   8
   9 static inline int
  10 dosvc (int fd, unsigned long high, unsigned low)
  11 {
  12   register int r0 asm("r0") = fd;
  13   register int r2 asm("r2") = high;
  14   register int r3 asm("r3") = low;
  15
  16   asm volatile("" : "=r"(r0) : "0"(r0), "r"(r2), "r"(r3));
  17   return r0;
  18 }
  19
  20 struct s
  21 {
  22   int fd;
  23   long long length;
  24 } s = { 2, 0 }, *p = &s;
  25
  26 int
  27 main (void)
  28 {
  29   unsigned low = p->length & 0xffffffff;
  30   unsigned high = p->length / 23;
  31
  32   if (dosvc (p->fd, high, low) != 2)
  33     __builtin_abort ();
  34   return 0;
  35 }