#define XSRETURN(off)                                   \
    STMT_START {                                        \
        const IV tmpXSoff = (off);                      \
        PL_stack_sp = PL_stack_base + ax + (tmpXSoff - 1);      \
        return;                                         \
    } STMT_END

##</code><code>##

void foo() {
   ...
   mXPUSHs(sv);
}

##</code><code>##

SV* foo() {
   ...
   return sv;
}