clear(freq)
	for _, c := range text {
		freq[c]++
	}
	return freq
}

func freq_32(text []int32, freq, bucket []int32) []int32 {
	if freq != nil && freq[0] >= 0 {
		return freq // already computed
	}
	if freq == nil {
		freq = bucket
	}

	clear(freq)
	for _, c := range text {
		freq[c]++
	}
	return freq
}

		// We initialize the levels as if we had already figured this out.
		levels[level] = levelInfo{
			level:        level,
			lastFreq:     list[1].freq,
			nextCharFreq: list[2].freq,
			nextPairFreq: list[0].freq + list[1].freq,
		}
		leafCounts[level][level] = 2
		if level == 1 {
			levels[level].nextPairFreq = math.MaxInt32
		}
	}

// 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]++
	}

EventBatch gen=1 m=0 time=0 size=15
ProcStatus dt=1 p=0 pstatus=1
GoStatus dt=1 g=1 m=0 gstatus=2
UserTaskBegin dt=1 task=2 parent_task=0 name_string=1 stack=0
EventBatch gen=1 m=18446744073709551615 time=0 size=5
Frequency freq=15625000
EventBatch gen=1 m=18446744073709551615 time=0 size=1
Stacks
EventBatch gen=1 m=18446744073709551615 time=0 size=11
Strings
String id=1
	data="my task"
EventBatch gen=2 m=0 time=5 size=13

		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)
		}

GoStop dt=1 reason_string=1 stack=0
EventBatch gen=1 m=1 time=0 size=12
ProcStatus dt=1 p=1 pstatus=1
GoStart dt=1 g=1 g_seq=1
GoStop dt=1 reason_string=1 stack=0
EventBatch gen=1 m=18446744073709551615 time=0 size=5
Frequency freq=15625000
EventBatch gen=1 m=18446744073709551615 time=0 size=1
Stacks
EventBatch gen=1 m=18446744073709551615 time=0 size=12
Strings
String id=1
	data="whatever"
EventBatch gen=2 m=1 time=3 size=8

	}
	// Initialize lastTs if it hasn't been yet.
	if b.lastTs == 0 {
		b.lastTs = freq.mul(batches[b.idx].time)
	}
	// Read an event out.
	n, tsdiff, err := readTimedBaseEvent(batches[b.idx].data[b.dataOff:], &b.ev)
	if err != nil {
		return false, err
	}
	// Complete the timestamp from the cursor's last timestamp.
	b.ev.time = freq.mul(tsdiff) + b.lastTs

	// Move the cursor's timestamp forward.
	b.lastTs = b.ev.time

-- expect --
FAILURE "expected a proc but didn't have one"
-- trace --
Trace Go1.22
EventBatch gen=1 m=0 time=0 size=5
Frequency freq=15625000
EventBatch gen=1 m=0 time=0 size=5
GoCreate dt=0 new_g=1 new_stack=0 stack=0

ProcStatus dt=1 p=0 pstatus=4
ProcSteal dt=1 p=0 p_seq=1 m=1
EventBatch gen=1 m=18446744073709551615 time=0 size=5
GoStatus dt=1 g=1 m=1 gstatus=3
EventBatch gen=1 m=18446744073709551615 time=0 size=5
Frequency freq=15625000
EventBatch gen=1 m=18446744073709551615 time=0 size=1
Stacks
EventBatch gen=1 m=18446744073709551615 time=0 size=1

ProcStart dt=1 p=1 p_seq=1
GoSyscallEndBlocked dt=1
EventBatch gen=1 m=1 time=0 size=9
ProcStatus dt=1 p=0 pstatus=4
ProcSteal dt=1 p=0 p_seq=1 m=0
EventBatch gen=1 m=18446744073709551615 time=0 size=5
Frequency freq=15625000
EventBatch gen=1 m=18446744073709551615 time=0 size=1
Stacks
EventBatch gen=1 m=18446744073709551615 time=0 size=1