final JvmStats jvmStats = JvmStats.jvmStats();
        final Mem mem = jvmStats.getMem();
        buf.append("\"memory\":{");
        buf.append("\"heap\":{");
        append(buf, "used", () -> mem.getHeapUsed().getBytes()).append(',');
        append(buf, "committed", () -> mem.getHeapCommitted().getBytes()).append(',');
        append(buf, "max", () -> mem.getHeapMax().getBytes()).append(',');

	// result: (FMOVDloadidx8 ptr idx mem)
	for {
		ptr := v_0
		if v_1.Op != OpARM64SLLconst || auxIntToInt64(v_1.AuxInt) != 3 {
			break
		}
		idx := v_1.Args[0]
		mem := v_2
		v.reset(OpARM64FMOVDloadidx8)
		v.AddArg3(ptr, idx, mem)
		return true
	}
	// match: (FMOVDloadidx (SLLconst [3] idx) ptr mem)
	// result: (FMOVDloadidx8 ptr idx mem)
	for {

	// are implemented inside of race runtime.
	mem, err := syscall.Mmap(-1, 0, 1<<20, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
	if err != nil {
		t.Fatalf("mmap failed: %v", err)
	}
	defer syscall.Munmap(mem)
	a := (*uint64)(unsafe.Pointer(&mem[0]))
	if *a != 0 {
		t.Fatalf("bad atomic value: %v, want 0", *a)
	}
	atomic.AddUint64(a, 1)

		v2.AddArg2(src, mem)
		v1.AddArg3(dst, v2, mem)
		v.AddArg3(dst, v0, v1)
		return true
	}
	// match: (Move [24] dst src mem)
	// result: (MOVDstore [16] dst (MOVDload [16] src mem) (MOVDstore [8] dst (MOVDload [8] src mem) (MOVDstore dst (MOVDload src mem) mem)))
	for {
		if auxIntToInt64(v.AuxInt) != 24 {
			break
		}
		dst := v_0
		src := v_1
		mem := v_2
		v.reset(OpS390XMOVDstore)

					mem = wbcall(pos, bEnd, cgoCheckMemmove, sp, mem, taddr, dst, src)
				}
				mem = bEnd.NewValue3I(pos, OpMove, types.TypeMem, w.AuxInt, dst, src, mem)
				mem.Aux = w.Aux
			case OpVarDef, OpVarLive:
				mem = bEnd.NewValue1A(pos, w.Op, types.TypeMem, w.Aux, mem)
			case OpStore:
				ptr := w.Args[0]
				val := w.Args[1]

(Store _ (StructMake0) mem) => mem
(Store dst (StructMake1 <t> f0) mem) =>
  (Store {t.FieldType(0)} (OffPtr <t.FieldType(0).PtrTo()> [0] dst) f0 mem)
(Store dst (StructMake2 <t> f0 f1) mem) =>
  (Store {t.FieldType(1)}
    (OffPtr <t.FieldType(1).PtrTo()> [t.FieldOff(1)] dst)
    f1
    (Store {t.FieldType(0)}
      (OffPtr <t.FieldType(0).PtrTo()> [0] dst)
        f0 mem))
(Store dst (StructMake3 <t> f0 f1 f2) mem) =>

		{name: "MOVBstoreidx", argLength: 4, reg: gpstoreidx, asm: "MOVB", typ: "Mem"},     // store bye
		{name: "MOVHstoreidx", argLength: 4, reg: gpstoreidx, asm: "MOVH", typ: "Mem"},     // store half word
		{name: "MOVWstoreidx", argLength: 4, reg: gpstoreidx, asm: "MOVW", typ: "Mem"},     // store word
		{name: "MOVDstoreidx", argLength: 4, reg: gpstoreidx, asm: "MOVD", typ: "Mem"},     // store double word

	{name: "StoreWB", argLength: 3, typ: "Mem", aux: "Typ"},    // Store arg1 to arg0. arg2=memory, aux=type.  Returns memory.
	{name: "MoveWB", argLength: 3, typ: "Mem", aux: "TypSize"}, // arg0=destptr, arg1=srcptr, arg2=mem, auxint=size, aux=type.  Returns memory.
	{name: "ZeroWB", argLength: 2, typ: "Mem", aux: "TypSize"}, // arg0=destptr, arg1=mem, auxint=size, aux=type. Returns memory.

		{name: "CALLtail", argLength: -1, reg: call, aux: "CallOff", call: true, tailCall: true}, // tail call static function aux.(*gc.Sym). last arg=mem, auxint=argsize, returns mem
		{name: "CALLclosure", argLength: -1, reg: callClosure, aux: "CallOff", call: true},       // call function via closure. arg0=codeptr, arg1=closure, last arg=mem, auxint=argsize, returns mem

}

func TestDeleteClearTail(t *testing.T) {
	mem := []*int{new(int), new(int), new(int), new(int), new(int), new(int)}
	s := mem[0:5] // there is 1 element beyond len(s), within cap(s)

	s = Delete(s, 2, 4)

	if mem[3] != nil || mem[4] != nil {
		// Check that potential memory leak is avoided
		t.Errorf("Delete: want nil discarded elements, got %v, %v", mem[3], mem[4])
	}
	if mem[5] == nil {