Re: [Emacs-diffs] master 605f901: Prefer memcpy and memset to doing it by hand

[Paul Eggert]

John Wiegley wrote:
> Is this so performance critical that we can't just always use the memset?

We can't always use the memset. The memset works only if the bit pattern we're 
trying to store can be implemented by storing the same unsigned char value 
repeatedly. The important special case here is storing Qnil, which is 
represented by the all-zeros bit pattern.