// medium zeroing uses a duff device
// 4, 16, and 64 are magic constants, see runtime/mkduff.go
(Zero [s] ptr mem)
	&& s%16 == 0 && s > 64 && s <= 16*64
	&& !config.noDuffDevice =>
	(DUFFZERO [4 * (64 - s/16)] ptr mem)

// large zeroing uses a loop
(Zero [s] ptr mem)
	&& s%16 == 0 && (s > 16*64 || config.noDuffDevice) =>
	(LoweredZero
		ptr
		(ADDconst <ptr.Type> [s-16] ptr)
		mem)

// moves

	460:  {region: 0xe9, script: 0x5, flags: 0x0},
	461:  {region: 0xe7, script: 0x5b, flags: 0x0},
	462:  {region: 0x9a, script: 0x22, flags: 0x0},
	463:  {region: 0x9a, script: 0x22, flags: 0x0},
	464:  {region: 0x166, script: 0x5b, flags: 0x0},
	465:  {region: 0x91, script: 0x5b, flags: 0x0},
	466:  {region: 0x61, script: 0x5b, flags: 0x0},
	467:  {region: 0x53, script: 0x3b, flags: 0x0},

		if body != "Hello world.\n" {
			b.Fatal("Got body:", body)
		}
	}

	b.StopTimer()
}

func BenchmarkClientServerParallel(b *testing.B) {
	for _, parallelism := range []int{4, 64} {
		b.Run(fmt.Sprint(parallelism), func(b *testing.B) {
			run(b, func(b *testing.B, mode testMode) {
				benchmarkClientServerParallel(b, parallelism, mode)
			}, []testMode{http1Mode, https1Mode, http2Mode})
		})

GoStop dt=7669 reason_string=20 stack=9
GoStart dt=9 g=94 g_seq=3
GoStop dt=5028 reason_string=20 stack=9
GoUnblock dt=76 g=23 g_seq=39 stack=0
GoStart dt=4 g=23 g_seq=40
GoLabel dt=1 label_string=4
GoBlock dt=464 reason_string=15 stack=5
GoUnblock dt=67 g=23 g_seq=41 stack=0
GoStart dt=151 g=23 g_seq=42
GoLabel dt=2 label_string=4
GoBlock dt=3280 reason_string=15 stack=5
GoStart dt=35 g=113 g_seq=6
GCMarkAssistEnd dt=7

pkg syscall (netbsd-arm64-cgo), const SYS_FCHMODAT ideal-int
pkg syscall (netbsd-arm64-cgo), const SYS_FCHMOD ideal-int
pkg syscall (netbsd-arm64-cgo), const SYS_FCHOWN = 123
pkg syscall (netbsd-arm64-cgo), const SYS_FCHOWNAT = 464
pkg syscall (netbsd-arm64-cgo), const SYS_FCHOWNAT ideal-int
pkg syscall (netbsd-arm64-cgo), const SYS_FCHOWN ideal-int
pkg syscall (netbsd-arm64-cgo), const SYS_FCHROOT = 297

pkg syscall (freebsd-386), const SYS_THR_KILL2 = 481
pkg syscall (freebsd-386), const SYS_THR_NEW = 455
pkg syscall (freebsd-386), const SYS_THR_SELF = 432
pkg syscall (freebsd-386), const SYS_THR_SET_NAME = 464
pkg syscall (freebsd-386), const SYS_THR_SUSPEND = 442
pkg syscall (freebsd-386), const SYS_THR_WAKE = 443
pkg syscall (freebsd-386), const SYS_TRUNCATE = 479
pkg syscall (freebsd-386), const SYS_UMASK = 60

    * PR [#464](https://github.com/tiangolo/fastapi/pull/464) by [@jonathanunderwood](https://github.com/jonathanunderwood).

pkg syscall (freebsd-arm64), const SYS_THR_NEW ideal-int
pkg syscall (freebsd-arm64), const SYS_THR_SELF = 432
pkg syscall (freebsd-arm64), const SYS_THR_SELF ideal-int
pkg syscall (freebsd-arm64), const SYS_THR_SET_NAME = 464
pkg syscall (freebsd-arm64), const SYS_THR_SET_NAME ideal-int
pkg syscall (freebsd-arm64), const SYS_THR_SUSPEND = 442
pkg syscall (freebsd-arm64), const SYS_THR_SUSPEND ideal-int

	// cond: s%16 == 0 && s > 64 && s <= 16*64 && !config.noDuffDevice
	// result: (DUFFZERO [4 * (64 - s/16)] ptr mem)
	for {
		s := auxIntToInt64(v.AuxInt)
		ptr := v_0
		mem := v_1
		if !(s%16 == 0 && s > 64 && s <= 16*64 && !config.noDuffDevice) {
			break
		}
		v.reset(OpARM64DUFFZERO)
		v.AuxInt = int64ToAuxInt(4 * (64 - s/16))
		v.AddArg2(ptr, mem)
		return true
	}

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