Effact of the pre-/post-loop patch on polyhedron 
option: gfortran -Ofast -funroll-loops -march=amdfam10

               compilation     code size      speed
              time reduction   reduction      improvement
                 (%)             (%)            (%)
-----------------------------------------------------------
          ac	-20.54		-17.15		0
      aermod	-15.93		-10.15		2.51
         air	-5.74		-5.45		-0.09
    capacita	-31.35		-18.27		0.08
     channel	-11.32		-10.24		1.22
       doduc	-4.52		-6.12		0.82
     fatigue	-34.51		-15.94		0
     gas_dyn	-45.56		-28.66		2.31
      induct	-3.1		-1.91		0.05
       linpk	-25.55		-27.5		0.26
        mdbx	-24.06		-19.74		1.27
          nf	-60.85		-48.92		-0.77
     protein	-44.73		-24.02		-0.19
      rnflow	-50.55		-36.69		0.47
    test_fpu	-52.49		-41.35		1.18
        tfft	-24.83		-18.29		0.39
-----------------------------------------------------------
     average	-28.48		-20.65		0.59