man ld-linux has very little to say about hwcap-dependent paths and various Linux distributions seem to have a different set of them active. For example, on x86, Debian's ld-linux/ldconfig seems to look for libs in /usr/lib/{,tls/}{i686,cmov} while Fedora's in /usr/lib/{,tls/}{i686,sse2}. Is there a definitive document describing this?