}
	if len(val.Counters) < len(data.Counters) {
		t := val.Counters
		val.Counters = mm.AllocateCounters(len(data.Counters))
		copy(val.Counters, t)
	}
	err, overflow := mm.MergeCounters(val.Counters, data.Counters)
	if err != nil {
		fatal("%v", err)
	}
	if overflow {
		warn("uint32 overflow during counter merge")
	}
	mm.pod.pmm[key] = val
}

			}

			// NB: sanity check on pkg and func IDs?
			key := pkfunc{pk: data.PkgIdx, fcn: data.FuncIdx}
			if prev, found := pmm[key]; found {
				// Note: no overflow reporting here.
				if err, _ := ts.cm.MergeCounters(data.Counters, prev); err != nil {
					return fmt.Errorf("processing counter data file %s: %v", cdf, err)
				}
			}
			c := ts.AllocateCounters(len(data.Counters))
			copy(c, data.Counters)
			pmm[key] = c