// FIXME: in theory either A) len(val.Counters) is zero, or B)
	// the two lengths are equal. Assert if not? Of course, we could
	// see odd stuff if there is source file skew.
	if *verbflag > 4 {
		fmt.Printf("visit pk=%d fid=%d len(counters)=%d\n", data.PkgIdx, data.FuncIdx, len(data.Counters))
	}
	if len(val.Counters) < len(data.Counters) {
		t := val.Counters
		val.Counters = mm.AllocateCounters(len(data.Counters))

		return
	}
	key := pkfunc{pk: data.PkgIdx, fcn: data.FuncIdx}
	val, found := d.mm[key]

	dbgtrace(5, "ctr visit pk=%d fid=%d found=%v len(val.ctrs)=%d len(data.ctrs)=%d", data.PkgIdx, data.FuncIdx, found, len(val.Counters), len(data.Counters))

	if len(val.Counters) < len(data.Counters) {
		t := val.Counters
		val.Counters = d.AllocateCounters(len(data.Counters))

// golang.org/x/telemetry/counter.Open.
func Open(telemetryDir string) {
	openedMu.Lock()
	defer openedMu.Unlock()
	if opened {
		panic("Open was called more than once")
	}
	telemetry.Default = telemetry.NewDir(telemetryDir)

	counter.Open()
	opened = true
}

// ReadCounter reads the given counter.
func ReadCounter(c *counter.Counter) (count uint64, _ error) {
	return ic.Read(c)
}

// 'go tool cover'.
func Coverage() float64 {
	if goexperiment.CoverageRedesign {
		return coverage2()
	}
	var n, d int64
	for _, counters := range cover.Counters {
		for i := range counters {
			if atomic.LoadUint32(&counters[i]) > 0 {
				n++
			}
			d++
		}
	}
	if d == 0 {
		return 0
	}
	return float64(n) / float64(d)
}

		if s.mode == subtractMode {
			for i := 0; i < len(data.Counters); i++ {
				if data.Counters[i] != 0 {
					val.Counters[i] = 0
				}
			}
		} else if s.mode == intersectMode {
			s.imm[key] = struct{}{}
			for i := 0; i < len(data.Counters); i++ {
				if data.Counters[i] == 0 {
					val.Counters[i] = 0
				}
			}
		}
	}
}

  /**
   * Multiple threads using same array of counters successfully update a number of times equal to
   * total count
   */
  public void testCountingInMultipleThreads() throws InterruptedException {
    final AtomicDoubleArray aa = new AtomicDoubleArray(SIZE);
    for (int i = 0; i < SIZE; i++) {
      aa.set(i, (double) COUNTDOWN);
    }
    Counter c1 = new Counter(aa);
    Counter c2 = new Counter(aa);

		klog.ErrorS(err, "Unable to get cpu perf counter data")
		return
	}

	memWorkingSetValue, err := memWorkingSetCounter.getData()
	if err != nil {
		klog.ErrorS(err, "Unable to get memWorkingSet perf counter data")
		return
	}

	memCommittedBytesValue, err := memCommittedBytesCounter.getData()
	if err != nil {
		klog.ErrorS(err, "Unable to get memCommittedBytes perf counter data")
		return
	}

// func xorKeyStreamVX(dst, src []byte, key *[8]uint32, nonce *[3]uint32, counter *uint32)
TEXT ·xorKeyStreamVX(SB), NOSPLIT, $0
	MOVD $·constants<>(SB), R1
	MOVD dst+0(FP), R2         // R2=&dst[0]
	LMG  src+24(FP), R3, R4    // R3=&src[0] R4=len(src)
	MOVD key+48(FP), R5        // R5=key
	MOVD nonce+56(FP), R6      // R6=nonce
	MOVD counter+64(FP), R7    // R7=counter

	// load BSWAP and J0
	VLM (R1), BSWAP, J0

	// setup

// CounterFlavor describes how function and counters are
// stored/represented in the counter section of the file.
type CounterFlavor uint8

const (
	// "Raw" representation: all values (pkg ID, func ID, num counters,
	// and counters themselves) are stored as uint32's.
	CtrRaw CounterFlavor = iota + 1

	// "ULeb" representation: all values (pkg ID, func ID, num counters,
	// and counters themselves) are stored with ULEB128 encoding.

			continue
		}
		prog := findProgReport(x.Meta, report)
		for k, v := range x.Count {
			if counter.IsStackCounter(k) {
				// stack
				prog.Stacks[k] += int64(v)
			} else {
				// counter
				prog.Counters[k] += int64(v)
			}
			succeeded = true
			fok = true
		}
		if !fok {
			u.logger.Printf("no counters found in %s", f)
		}
	}
	if !succeeded {