}
	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 {

		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)