[Bug tree-optimization/80520] [7/8 Regression] Performance regression from missing if-conversion

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80520

Marc Glisse <glisse at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-04-26
            Summary|Performance regression from |[7/8 Regression]
                   |missing if-conversion       |Performance regression from
                   |                            |missing if-conversion
     Ever confirmed|0                           |1

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
clang generates much slower code (and even worse with libc++).
With a combination of -march=native and -fprofile-{generate,use}, I can get
faster code from gcc-7 than from gcc-6, while the .optimized dump still has
branches and not cond_expr.