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/* 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" } } */
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