[PATCH v4] mbuf: optimize segment prefree

[Morten Brørup]

> > +#if !defined(RTE_TOOLCHAIN_GCC) || defined __DOXYGEN__
> >  /**
> >   * Returns TRUE if given mbuf is direct, or FALSE otherwise.
> >   *
> > @@ -714,6 +715,52 @@ struct rte_mbuf_ext_shared_info {
> >   */
> >  #define RTE_MBUF_DIRECT(mb) \
> >  	(!((mb)->ol_flags & (RTE_MBUF_F_INDIRECT | RTE_MBUF_F_EXTERNAL)))
> > +#else /* RTE_TOOLCHAIN_GCC */
> 
> Do we need the non-gcc block?

I have now tested with a bunch of compilers on Godbolt, and it seems only clang doesn't need this optimization, so I'll remove the compiler check and make the optimized variant the only one.