anchor.diff:  #
   # Intel IvyBridge only
   CPU,ivb
  +CPU,ivb_ep
   #
   PRESET,PAPI_L2_TCW,NOT_DERIVED,L2_RQSTS:ALL_RFO
   PRESET,PAPI_L2_DCH,DERIVED_ADD,L2_RQSTS:DEMAND_DATA_RD_HIT,L2_RQSTS:RFO_HIT
  
positive.code: CPU,core
  #
  PRESET,PAPI_TOT_CYC,NOT_DERIVED,UNHALTED_CORE_CYCLES
  PRESET,PAPI_REF_CYC,NOT_DERIVED,UNHALTED_REFERENCE_CYCLES
  PRESET,PAPI_TOT_INS,NOT_DERIVED,INSTRUCTIONS_RETIRED
  PRESET,PAPI_L1_ICM,NOT_DERIVED,L1I_MISSES
  PRESET,PAPI_L1_ICA,NOT_DERIVED,L1I_READS
  
negative.code: CPU,snb
  CPU,snb_ep
  CPU,ivb
  CPU,ivb_ep
  #
  PRESET,PAPI_TOT_CYC,NOT_DERIVED,UNHALTED_CORE_CYCLES
  PRESET,PAPI_REF_CYC,NOT_DERIVED,UNHALTED_REFERENCE_CYCLES
  