https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83354

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2017-12-11
                 CC|                            |rguenth at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
We have that:

  (simplify
   (pows (cbrts tree_expr_nonnegative_p@0) @1)
   (pows @0 (mult @1 { build_real_truncate (type, dconst_third ()); })))

the constraint is that we have to know x is not negative.  If you
write pow(cbrt(fabs(x)), y) you'll see.

So WORKSFORME?

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