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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/95060] vfnmsub132ps is not generated with
 -ffast-math
Date: Mon, 11 May 2020 19:49:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95060

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I see the needed simplifiers in match.pd:
  (simplify
   (negate (fmas@3 @0 @1 @2))
   (if (single_use (@3))
    (IFN_FNMS @0 @1 @2))))
but perhaps the problem is that there is no forwprop after widening_mul that
would perform that optimization?
So, shall widening_mul itself if it matches some FMA check if the result of
IFN_{FMA,FMS,FNMA,FNMS} it created isn't negation and if yes, try to
gimple_fold it?=