}
				if got != want {
					t.Fatalf("TrailingZeros16(%#04x) == %d; want %d", x, got, want)
				}
			}

			if x <= 1<<32-1 {
				got := TrailingZeros32(uint32(x))
				if x == 0 {
					want = 32
				}
				if got != want {
					t.Fatalf("TrailingZeros32(%#08x) == %d; want %d", x, got, want)
				}
				if UintSize == 32 {
					got = TrailingZeros(uint(x))
					if got != want {

		if got := bits.TrailingZeros64(tt.x); got != tt.want {
			t.Errorf("TrailingZeros64(%#x) = %d, want %d", tt.x, got, tt.want)
		}
		want := tt.want
		if want == 64 {
			want = 32
		}
		if got := bits.TrailingZeros32(uint32(tt.x)); got != want {
			t.Errorf("TrailingZeros64(%#x) = %d, want %d", tt.x, got, want)
		}
	}
}

func TestRound(t *testing.T) {
	for _, tt := range []struct {
		x, want float64
	}{

		var shift uintptr
		if goarch.PtrSize == 8 {
			// Mask shift for better code generation.
			shift = uintptr(sys.TrailingZeros64(uint64(et.Size_))) & 63
		} else {
			shift = uintptr(sys.TrailingZeros32(uint32(et.Size_))) & 31
		}
		lenmem = uintptr(oldLen) << shift
		newlenmem = uintptr(newLen) << shift
		capmem = roundupsize(uintptr(newcap)<<shift, noscan)
		overflow = uintptr(newcap) > (maxAlloc >> shift)

		panic(fmt.Sprintf("invalid PPC64 rotate mask: %x %d %d", uint64(mask), rotate, nbits))
	} else if nbits == 32 {
		mb = bits.LeadingZeros32(uint32(mask))
		me = 32 - bits.TrailingZeros32(uint32(mask))
		mbn = bits.LeadingZeros32(^uint32(mask))
		men = 32 - bits.TrailingZeros32(^uint32(mask))
	} else {
		mb = bits.LeadingZeros64(uint64(mask))
		me = 64 - bits.TrailingZeros64(uint64(mask))
		mbn = bits.LeadingZeros64(^uint64(mask))

	// TESTQ/JEQ
	if tp.mask == 0 {
		return tp, 0
	}
	// BSFQ
	var i int
	if goarch.PtrSize == 8 {
		i = sys.TrailingZeros64(uint64(tp.mask))
	} else {
		i = sys.TrailingZeros32(uint32(tp.mask))
	}
	// BTCQ
	tp.mask ^= uintptr(1) << (i & (ptrBits - 1))
	// LEAQ (XX)(XX*8)
	return tp, tp.addr + uintptr(i)*goarch.PtrSize
}

//
// Note, me is inclusive.
func decodeMask32(mask uint32) (mb, me uint32, valid bool) {
	mb = uint32(bits.LeadingZeros32(mask))
	me = uint32(32 - bits.TrailingZeros32(mask))
	mbn := uint32(bits.LeadingZeros32(^mask))
	men := uint32(32 - bits.TrailingZeros32(^mask))
	// Check for a wrapping mask (e.g bits at 0 and 31)
	if mb == 0 && me == 32 {
		// swap the inverted values
		mb, me = men, mbn
	}

		sys.AMD64)
	alias("math/bits", "Div", "math/bits", "Div64", sys.ArchAMD64)

	alias("runtime/internal/sys", "TrailingZeros8", "math/bits", "TrailingZeros8", all...)
	alias("runtime/internal/sys", "TrailingZeros32", "math/bits", "TrailingZeros32", all...)
	alias("runtime/internal/sys", "TrailingZeros64", "math/bits", "TrailingZeros64", all...)
	alias("runtime/internal/sys", "Len8", "math/bits", "Len8", all...)

		{"RotateLeft64", Func, 9},
		{"RotateLeft8", Func, 9},
		{"Sub", Func, 12},
		{"Sub32", Func, 12},
		{"Sub64", Func, 12},
		{"TrailingZeros", Func, 9},
		{"TrailingZeros16", Func, 9},
		{"TrailingZeros32", Func, 9},
		{"TrailingZeros64", Func, 9},
		{"TrailingZeros8", Func, 9},
		{"UintSize", Const, 9},
	},
	"math/cmplx": {
		{"Abs", Func, 0},
		{"Acos", Func, 0},
		{"Acosh", Func, 0},