[Bug middle-end/77568] [7 regression] CSE/PRE/Hoisting blocks common instruction contractions

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77568

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2
   Target Milestone|7.0                         |8.0

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
The FMA regression would need to be solved by enhancing FMA recognition on
GIMPLE.  Not sth appropriate for GCC 7 at this point (and on some
microarchitecture that would end up if-converting the thing it might be
preferable to have a single multiplication rather than two fmas due to
resource constraints).