// the caller must set freq[0] = -1 to force recomputation
// the next time it is needed.
func freq_8_32(text []byte, freq, bucket []int32) []int32 {
	if freq != nil && freq[0] >= 0 {
		return freq // already computed
	}
	if freq == nil {
		freq = bucket
	}

	freq = freq[:256] // eliminate bounds check for freq[c] below
	clear(freq)
	for _, c := range text {
		freq[c]++
	}

		if err != nil {
			return err
		}
		g.cpuSamples = samples
	case b.isFreqBatch():
		freq, err := parseFreq(b)
		if err != nil {
			return err
		}
		if g.freq != 0 {
			return fmt.Errorf("found multiple frequency events")
		}
		g.freq = freq
	case b.exp != event.NoExperiment:
		if g.expData == nil {
			g.expData = make(map[event.Experiment]*ExperimentalData)
		}

	EvCPUSamples // start of a section of CPU samples [...EvCPUSample]
	EvCPUSample  // CPU profiling sample [timestamp, M ID, P ID, goroutine ID, stack ID]
	EvFrequency  // timestamp units per sec [freq]

	// Procs.
	EvProcsChange // current value of GOMAXPROCS [timestamp, GOMAXPROCS, stack ID]
	EvProcStart   // start of P [timestamp, P ID, P seq]
	EvProcStop    // stop of P [timestamp]

)

type Timespec struct {
	Sec  int64
	Nsec int64
}

type Timeval struct {
	Sec  int64
	Usec int64
}

type Timex struct {
	Modes     uint32
	Pad_cgo_0 [4]byte
	Offset    int64
	Freq      int64
	Maxerror  int64
	Esterror  int64
	Status    int32
	Pad_cgo_1 [4]byte
	Constant  int64
	Precision int64
	Tolerance int64
	Time      Timeval
	Tick      int64
	Ppsfreq   int64
	Jitter    int64

)

type Timespec struct {
	Sec  int64
	Nsec int64
}

type Timeval struct {
	Sec  int64
	Usec int64
}

type Timex struct {
	Modes     uint32
	Pad_cgo_0 [4]byte
	Offset    int64
	Freq      int64
	Maxerror  int64
	Esterror  int64
	Status    int32
	Pad_cgo_1 [4]byte
	Constant  int64
	Precision int64
	Tolerance int64
	Time      Timeval
	Tick      int64
	Ppsfreq   int64
	Jitter    int64

type (
	_C_long int64
)

type Timespec struct {
	Sec  int64
	Nsec int64
}

type Timeval struct {
	Sec  int64
	Usec int64
}

type Timex struct {
	Modes     uint32
	Offset    int64
	Freq      int64
	Maxerror  int64
	Esterror  int64
	Status    int32
	Constant  int64
	Precision int64
	Tolerance int64
	Time      Timeval
	Tick      int64
	Ppsfreq   int64
	Jitter    int64
	Shift     int32

type (
	_C_long int32
)

type Timespec struct {
	Sec  int32
	Nsec int32
}

type Timeval struct {
	Sec  int32
	Usec int32
}

type Timex struct {
	Modes     uint32
	Offset    int32
	Freq      int32
	Maxerror  int32
	Esterror  int32
	Status    int32
	Constant  int32
	Precision int32
	Tolerance int32
	Time      Timeval
	Tick      int32
	Ppsfreq   int32
	Jitter    int32
	Shift     int32

type (
	_C_long int64
)

type Timespec struct {
	Sec  int64
	Nsec int64
}

type Timeval struct {
	Sec  int64
	Usec int64
}

type Timex struct {
	Modes     uint32
	Offset    int64
	Freq      int64
	Maxerror  int64
	Esterror  int64
	Status    int32
	Constant  int64
	Precision int64
	Tolerance int64
	Time      Timeval
	Tick      int64
	Ppsfreq   int64
	Jitter    int64
	Shift     int32

)

type Timespec struct {
	Sec  int64
	Nsec int64
}

type Timeval struct {
	Sec  int64
	Usec int64
}

type Timex struct {
	Modes     uint32
	Pad_cgo_0 [4]byte
	Offset    int64
	Freq      int64
	Maxerror  int64
	Esterror  int64
	Status    int32
	Pad_cgo_1 [4]byte
	Constant  int64
	Precision int64
	Tolerance int64
	Time      Timeval
	Tick      int64
	Ppsfreq   int64
	Jitter    int64

)

type Timespec struct {
	Sec  int64
	Nsec int64
}

type Timeval struct {
	Sec  int64
	Usec int64
}

type Timex struct {
	Modes     uint32
	Pad_cgo_0 [4]byte
	Offset    int64
	Freq      int64
	Maxerror  int64
	Esterror  int64
	Status    int32
	Pad_cgo_1 [4]byte
	Constant  int64
	Precision int64
	Tolerance int64
	Time      Timeval
	Tick      int64
	Ppsfreq   int64
	Jitter    int64