intRegs += uint64(typ.intRegs)
		floatRegs += uint64(typ.floatRegs)
	}

	// Final size includes trailing padding.
	size = RoundUp(size, int64(maxAlign))

	if intRegs > math.MaxUint8 || floatRegs > math.MaxUint8 {
		intRegs = math.MaxUint8
		floatRegs = math.MaxUint8
	}

	t.width = size
	t.align = maxAlign
	t.intRegs = uint8(intRegs)
	t.floatRegs = uint8(floatRegs)

	fn := func(x int, y float64) (y0Ret int, y1Ret float64) {
		return x + 1, y + 1.0
	}
	var args *stackArgs
	var regs abi.RegArgs
	intRegs := regs.Ints[:]
	floatRegs := regs.Floats[:]
	fval := float64(42.0)
	if len(intRegs) > 0 {
		intRegs[0] = 42
		floatRegs[0] = math.Float64bits(fval)
	} else {
		args = &stackArgs{
			x0: 42,
			x1: 42.0,
		}
	}

	t.extra = underlying.extra
	t.width = underlying.width
	t.align = underlying.align
	t.alg = underlying.alg
	t.ptrBytes = underlying.ptrBytes
	t.intRegs = underlying.intRegs
	t.floatRegs = underlying.floatRegs
	t.underlying = underlying.underlying

	if underlying.NotInHeap() {
		t.SetNotInHeap(true)
	}
	if underlying.HasShape() {
		t.SetHasShape(true)
	}

		c, d *byte
	}

	type test struct {
		rcvr, typ                  Type
		size, argsize, retOffset   uintptr
		stack, gc, inRegs, outRegs []byte // pointer bitmap: 1 is pointer, 0 is scalar
		intRegs, floatRegs         int
		floatRegSize               uintptr
	}
	tests := []test{
		{
			typ:       ValueOf(func(a, b string) string { return "" }).Type(),
			size:      6 * goarch.PtrSize,

	{"% d", []byte{1, 11, 111}, "[ 1  11  111]"},
	{"%+d", [3]byte{1, 11, 111}, "[+1 +11 +111]"},
	{"%# -6d", []byte{1, 11, 111}, "[ 1      11     111  ]"},
	{"%#+-6d", [3]byte{1, 11, 111}, "[+1     +11    +111  ]"},

	// floates with %v
	{"%v", 1.2345678, "1.2345678"},
	{"%v", float32(1.2345678), "1.2345678"},

	// complexes with %v
	{"%v", 1 + 2i, "(1+2i)"},
	{"%v", complex64(1 + 2i), "(1+2i)"},

	// structs