Knowing assembly won't teach you the difference between legal overflows and ones triggering undefined behavior, or why you might need -fno-strict-aliasing to ca

Knowing assembly won't teach you the difference between legal overflows and ones triggering undefined behavior, or why you might need -fno-strict-aliasing to cast your pointers, and many more things. Does anybody know any correct nontrivial C programs beyond the ones by DJB? Or anything close? And it's not like, once bug-free, those are evolving much...