On Fri, 15 Dec 2017, Jakub Jelinek wrote:
> On Fri, Dec 15, 2017 at 11:08:43AM +0100, Richard Biener wrote:
> > --- gcc/internal-fn.def (revision 255678)
> > +++ gcc/internal-fn.def (working copy)
> > @@ -254,6 +254,9 @@ DEF_INTERNAL_FN (LAUNDER, ECF_LEAF | ECF
> > /* Divmod function. */
> > DEF_INTERNAL_FN (DIVMOD, ECF_CONST | ECF_LEAF, NULL)
> >
> > +/* A NOP function with aribtrary arguments and return value. */
>
> arbitrary
>
> > +static void
> > +expand_NOP (internal_fn, gcall *call_stmt)
> > +{
> > + /* Nothing. But it shouldn't really prevail. */
>
> It could with -O0 (but who would use -flto -O0) or with -fno-tree-dce
> -fno-tree-whateverelse.
Yeah, with the -O0 variant of the testcase it does prevail and then
we expand it to nothing.
Richard.
