mask := make([]byte, n)
		base := uintptr(abi.MapBucketCount / goarch.PtrSize)

		if ktyp.Pointers() {
			emitGCMask(mask, base, ktyp, abi.MapBucketCount)
		}
		base += abi.MapBucketCount * ktyp.Size_ / goarch.PtrSize

		if etyp.Pointers() {
			emitGCMask(mask, base, etyp, abi.MapBucketCount)
		}
		base += abi.MapBucketCount * etyp.Size_ / goarch.PtrSize

		word := base