"I've been writing C for quite some time, but I never followed good conventions I'm afraid, and I never payed much attention to the optimization tricks of the higher C programmers. Sure, I use const when I can, I use the pointer methods for manual string copying, I even use register for all the good that does with modern compilers, but now, I'm trying to write a C-string handling library for personal use, but I need speed, and I really don't want to use inline ASM. So, I am wondering, what would other Soylenters do to write efficient, pure, standards-compliant C?"
It really depends on the context of application. If he wants to manipulate strings ever so often, then that seems like an overkill. If he's going to be crunching strings like beta crunches F-bombs, then it might be a good idea to go beyond that.
I often say that Context Information is everything. And it really is.