Maybe for media, crypto, things like that, but we all have the source for the C-standard libaries, and there is not all that much assembly in there given the si

Maybe for media, crypto, things like that, but we all have the source for the C-standard libaries, and there is not all that much assembly in there given the size of the code base. Certainly you have required architecture instructions for things like instruction scheduling (isync/dsync), stack manipulation (setjump/longjump and others) or floating point, but though it looks like a lot of assembly source, it is really just a little bit for each of the many supported architectures in the tree. And most of it isn't performance related, it is just plain required because architectures vary on things like instruction scheduling and stack/cache manipulation.