Subversion Repositories openrisc_2011-10-31

/* Verify that NRV optimizations are prohibited when the LHS is an

   indirect reference to something that may be call-clobbered. */

/* { dg-do compile } */

/* { dg-options "-O -fdump-tree-optimized" } */

typedef struct { int x[20]; void *y; } S;

S nrv_candidate (void);

void use_result (S);

void make_escape (S *);

S global_S;

void foo (void)

{

  S *result;

  S local_S;

  /* We can't perform return slot optimization because global_S is

     global and may be clobbered by nrv_candidate.  */

  result = &global_S;

  *result = nrv_candidate ();

  use_result (*result);

  /* We can't perform return slot optimization because local_S is

     call_clobbered (its address escapes prior to invoking

     nrv_candidate).  */

  make_escape (&local_S);

  result = &local_S;

  *result = nrv_candidate ();

  use_result (*result);

}

/* { dg-final { scan-tree-dump-times "return slot optimization" 0 "optimized" } } */

/* { dg-final { cleanup-tree-dump "optimized" } } */