s string
    n int
}
`
	ts := findStructType(t, src)
	sizes := types2.StdSizes{WordSize: 4, MaxAlign: 4}
	if got := sizes.Sizeof(ts); got != 20 {
		t.Errorf("Sizeof(%v) with WordSize 4 = %d want 20", ts, got)
	}
	sizes = types2.StdSizes{WordSize: 8, MaxAlign: 8}
	if got := sizes.Sizeof(ts); got != 40 {
		t.Errorf("Sizeof(%v) with WordSize 8 = %d want 40", ts, got)
	}
}

// go.dev/issue/16464

		// Multiword data structures are effectively structs
		// in which each element has size WordSize.
		// Type parameters lead to variable sizes/alignments;
		// StdSizes.Alignof won't be called for them.
		assert(!isTypeParam(T))
		return s.WordSize
	case *Basic:
		// Strings are like slices and interfaces.
		if t.Info()&IsString != 0 {
			return s.WordSize
		}
	case *TypeParam, *Union:
		panic("unreachable")
	}

		if uintptr(n)%wordSize == 0 {
			return
		}
		done := n &^ int(wordSize-1)
		dst = dst[done:]
		x = x[done:]
		y = y[done:]
	}
	xorLoop(dst, x, y)
}

// aligned reports whether dst, x, and y are all word-aligned pointers.
func aligned(dst, x, y *byte) bool {
	return (uintptr(unsafe.Pointer(dst))|uintptr(unsafe.Pointer(x))|uintptr(unsafe.Pointer(y)))&(wordSize-1) == 0
}

		// Multiword data structures are effectively structs
		// in which each element has size WordSize.
		// Type parameters lead to variable sizes/alignments;
		// StdSizes.Alignof won't be called for them.
		assert(!isTypeParam(T))
		return s.WordSize
	case *Basic:
		// Strings are like slices and interfaces.
		if t.Info()&IsString != 0 {
			return s.WordSize
		}
	case *TypeParam, *Union:
		panic("unreachable")
	}

		// Multiword data structures are effectively structs
		// in which each element has size WordSize.
		// Type parameters lead to variable sizes/alignments;
		// StdSizes.Alignof won't be called for them.
		assert(!isTypeParam(T))
		return s.WordSize
	case *Basic:
		// Strings are like slices and interfaces.
		if t.Info()&IsString != 0 {
			return s.WordSize
		}
	case *TypeParam, *Union:
		panic("unreachable")
	}

    s string
    n int
}
`
	ts := findStructType(t, src)
	sizes := types.StdSizes{WordSize: 4, MaxAlign: 4}
	if got := sizes.Sizeof(ts); got != 20 {
		t.Errorf("Sizeof(%v) with WordSize 4 = %d want 20", ts, got)
	}
	sizes = types.StdSizes{WordSize: 8, MaxAlign: 8}
	if got := sizes.Sizeof(ts); got != 40 {
		t.Errorf("Sizeof(%v) with WordSize 8 = %d want 40", ts, got)
	}
}

// go.dev/issue/16464

		// Multiword data structures are effectively structs
		// in which each element has size WordSize.
		// Type parameters lead to variable sizes/alignments;
		// StdSizes.Alignof won't be called for them.
		assert(!isTypeParam(T))
		return s.WordSize
	case *Basic:
		// Strings are like slices and interfaces.
		if t.Info()&IsString != 0 {
			return s.WordSize
		}
	case *TypeParam, *Union:
		panic("unreachable")
	}

		},
	}
}

var compatFreeBSD32 bool // 386 emulation on amd64

func probeRoutingStack() (int, map[int]*wireFormat) {
	var p uintptr
	wordSize := int(unsafe.Sizeof(p))
	align := wordSize
	// In the case of kern.supported_archs="amd64 i386", we need
	// to know the underlying kernel's architecture because the
	// alignment for routing facilities are set at the build time
	// of the kernel.

type archiveMap map[string]uint64

// readArmap reads the archive symbol map.
func readArmap(filename string, f *bio.Reader, arhdr ArHdr) archiveMap {
	is64 := arhdr.name == "/SYM64/"
	wordSize := 4
	if is64 {
		wordSize = 8
	}

	contents := make([]byte, atolwhex(arhdr.size))
	if _, err := io.ReadFull(f, contents); err != nil {
		Exitf("short read from %s", filename)
	}

	var c uint64
	if is64 {

			fmt.Printf("error: got std fibo(%d) = %s; want %s\n", test.n, got, test.want)
			os.Exit(1)
		}
	}
}

func selfTest() {
	if W != 32 && W != 64 {
		fmt.Printf("error: unexpected wordsize %d", W)
		os.Exit(1)
	}
	for i := 0; i < 4; i++ {
		test(i&2 == 0, i&1 != 0)
	}
}

func doFibo(n int) {
	start := time.Now()
	f := fibo(n, *half, *opt)
	t := time.Since(start)