On Wed, Nov 10, 2010 at 12:29, H.J. Lu <hjl.tools@gmail.com> wrote: > With IFUNC functions, glibc testsuite can only test one implementation. > We need a way to test SSE2/SSSE3/SSE4 implementations on SSE4 > machines. You do unit testing. Link the test app against the .o/.os file and call the function y its real name (__strcmp_sse4 etc).