after = append(after[:0], b.Values[end:]...)
		b.Values = b.Values[:start]

		// find the memory before the WB stores
		mem := stores[0].MemoryArg()
		pos := stores[0].Pos

		// If the source of a MoveWB is volatile (will be clobbered by a
		// function call), we need to copy it to a temporary location, as
		// marshaling the args of wbMove might clobber the value we're
		// trying to move.

	// Expand to runtime calls. Write barrier will be removed if write on stack.
	{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.

		auxType: auxTypSize,
		argLen:  2,
		generic: true,
	},
	{
		name:    "StoreWB",
		auxType: auxTyp,
		argLen:  3,
		generic: true,
	},
	{
		name:    "MoveWB",
		auxType: auxTypSize,
		argLen:  3,
		generic: true,
	},
	{
		name:    "ZeroWB",
		auxType: auxTypSize,
		argLen:  2,
		generic: true,
	},
	{