https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86895

            Bug ID: 86895
           Summary: Wrong description of -fvect-cost-model in common.opt
           Product: gcc
           Version: 8.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: niva at niisi dot msk.ru
  Target Milestone: ---

gcc --help -v prints the following:

  Specifies the cost model for vectorization.
-fvect-cost-model=[unlimited|dynamic|cheap] Specifies
                              the cost model for vectorization.

I think that this results from the defect in gcc/common.opt:

fvect-cost-model=
Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model)
Init(VECT_COST_MODEL_DEFAULT) Optimization
Specifies the cost model for vectorization.
-fvect-cost-model=[unlimited|dynamic|cheap]     Specifies the cost model for
vectorization.

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