94   bnk->pert = bnk->sval;  in TaoBNKInitialize()
417   if (shift && bnk->pert > 0) {  in TaoBNKComputeStep()
420       PetscCall(MatShift(tao->hessian, bnk->pert));  in TaoBNKComputeStep()
422       PetscCall(MatShift(bnk->H_inactive, bnk->pert));  in TaoBNKComputeStep()
423       if (bnk->H_inactive != bnk->Hpre_inactive) PetscCall(MatShift(bnk->Hpre_inactive, bnk->pert));  in TaoBNKComputeStep()
570       if (bnk->pert <= 0.0) {  in TaoBNKSafeguardStep()
574         bnk->pert = PetscMin(bnk->imax, PetscMax(bnk->imin, bnk->imfac * bnk->gnorm));  in TaoBNKSafeguardStep()
578           bnk->pert = PetscMax(bnk->pert, -e_min);  in TaoBNKSafeguardStep()
582         bnk->pert = PetscMin(bnk->pmax, PetscMax(bnk->pgfac * bnk->pert, bnk->pmgfac * bnk->gnorm));  in TaoBNKSafeguardStep()
632         if (bnk->pert <= 0.0) {  in TaoBNKSafeguardStep()
636           bnk->pert = PetscMin(bnk->imax, PetscMax(bnk->imin, bnk->imfac * bnk->gnorm));  in TaoBNKSafeguardStep()
640             bnk->pert = PetscMax(bnk->pert, -e_min);  in TaoBNKSafeguardStep()
644 …       bnk->pert = PetscMin(bnk->pmax, PetscMax(bnk->pgfac * bnk->pert, bnk->pmgfac * bnk->gnorm));  in TaoBNKSafeguardStep()
650         bnk->pert = PetscMin(bnk->psfac * bnk->pert, bnk->pmsfac * bnk->gnorm);  in TaoBNKSafeguardStep()
651         if (bnk->pert < bnk->pmin) bnk->pert = 0.0;  in TaoBNKSafeguardStep()
712       if (bnk->pert <= 0.0) {  in TaoBNKPerformLineSearch()
716         bnk->pert = PetscMin(bnk->imax, PetscMax(bnk->imin, bnk->imfac * bnk->gnorm));  in TaoBNKPerformLineSearch()
720           bnk->pert = PetscMax(bnk->pert, -e_min);  in TaoBNKPerformLineSearch()
724         bnk->pert = PetscMin(bnk->pmax, PetscMax(bnk->pgfac * bnk->pert, bnk->pmgfac * bnk->gnorm));  in TaoBNKPerformLineSearch()