[Bug target/97832] AoSoA complex caxpy-like loops: AVX2+FMA -Ofast 7 times slower than -O3

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97832

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot 
gnu.org
                 CC|                            |rguenth at gcc dot gnu.org
             Target|x86-64                      |x86_64-*-* i?86-*-*
           Keywords|                            |missed-optimization
             Blocks|                            |53947
   Last reconfirmed|                            |2020-11-16
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |ASSIGNED

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Let me do some initial analysis.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations