Subversion Repositories openrisc_2011-10-31

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

   something that may be call-clobbered. */

/* { dg-do compile } */

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

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

typedef struct { int a; S b; } T;

S nrv_candidate (void);

void use_result (S);

void make_escape (S *);

void foo (void)

{

  S result;

  T result_arr[10][5];

  make_escape (&result);

  make_escape (&(result_arr[3][4].b));

  /* Neither call should be allowed to use NRV optimization.  */

  result = nrv_candidate ();

  result_arr[3][4].b = nrv_candidate ();

  use_result (result);

  use_result (result_arr[3][4].b);

}

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

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