[Bug ipa/81000] std::any improvement
glisse at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Wed Jun 7 21:01:00 GMT 2017
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81000
Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-06-07
CC| |marxin at gcc dot gnu.org
Component|c++ |ipa
Ever confirmed|0 |1
--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
This is almost a duplicate of similar PRs about std::function, etc. We discover
that _S_manage is the function that is called only in FRE3, much too late to
inline it. IIRC, LLVM alternates between inlining and other optimizations,
which helps a lot on this kind of code. Sprinkling
__attribute__((always_inline)) is not sufficient, we need to inline one
function before FRE or similar can propagate which function is called next and
needs inlining before FRE etc.
(Of course, a different implementation of std::any might be easier to optimize)
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