}
	if runtime.GOARCH != "386" {
		// As explained above, TrailingZeros64 and TrailingZeros32 are not Go code on 386.
		// The same applies to Bswap32.
		want["runtime/internal/sys"] = append(want["runtime/internal/sys"], "TrailingZeros64")
		want["runtime/internal/sys"] = append(want["runtime/internal/sys"], "TrailingZeros32")
		want["runtime/internal/sys"] = append(want["runtime/internal/sys"], "Bswap32")
	}

	if x == 0 {
		return 16
	}
	// see comment in TrailingZeros64
	return int(deBruijn32tab[uint32(x&-x)*deBruijn32>>(32-5)])
}

// TrailingZeros32 returns the number of trailing zero bits in x; the result is 32 for x == 0.
func TrailingZeros32(x uint32) int {
	if x == 0 {
		return 32
	}
	// see comment in TrailingZeros64
	return int(deBruijn32tab[(x&-x)*deBruijn32>>(32-5)])
}

	return bits.TrailingZeros64(1 - n)
}

func TrailingZeros32(n uint32) int {
	// amd64/v1,amd64/v2:"BTSQ\\t\\$32","BSFQ"
	// amd64/v3:"TZCNTL"
	// 386:"BSFL"
	// arm:"CLZ"
	// arm64:"RBITW","CLZW"
	// s390x:"FLOGR","MOVWZ"
	// ppc64x/power8:"ANDN","POPCNTW"
	// ppc64x/power9: "CNTTZW"
	// wasm:"I64Ctz"
	return bits.TrailingZeros32(n)
}

func TrailingZeros16(n uint16) int {

pkg math/bits, func RotateLeft64(uint64, int) uint64
pkg math/bits, func RotateLeft8(uint8, int) uint8
pkg math/bits, func TrailingZeros(uint) int
pkg math/bits, func TrailingZeros16(uint16) int
pkg math/bits, func TrailingZeros32(uint32) int
pkg math/bits, func TrailingZeros64(uint64) int
pkg math/bits, func TrailingZeros8(uint8) int
pkg mime, var ErrInvalidMediaParameter error
pkg mime/multipart, type FileHeader struct, Size int64

		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)