Feng LI <nemoking...@gmail.com> writes:
> I use unspec_volatile for a function with void arguments and
> void return value for some initialization work. But it didn't generate
> code in this case. I think probably I need to add more restrictions
> some where but I don't know why and how. The code looks like:
>
> extern __inline void __attribute__((__gnu_inline__, __always_inline__,
> __artificial__))
> __TEnd (void)
> {
> __builtin_ia32_tend ();
> }
>
> (define_expand "dta_tend"
> [(unspec_volatile [(const_int 0)] UNSPEC_TEND)]
> ""
> "")
>
> (define_insn "*dta_tend"
> [(unspec_volatile [(const_int 0)] UNSPEC_TEND)]
> ""
> "tend"
> [(set_attr "length" "3")
> (set_attr "mode" "none")])
In the RTL dumps generated by -da, where does the insn appear and where
does it disappear?
Ian
