[Bug tree-optimization/120886] New: SLP build does not consider operand swapping for commutative builtin functions

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120886

            Bug ID: 120886
           Summary: SLP build does not consider operand swapping for
                    commutative builtin functions
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

While r16-1778-gf788324c724240 added support for internal functions notably
support for __builtin_fma () is missing because
commutative_ternary_fn_p operates on internal_fn rather than combined_fn.