Neil, > Hey all- > I've been trying to update the fedora dpdk package to support VFIO > enabled drivers and ran into a problem in which ixgbe didn't compile because > the > rxtx_vec code uses sse4.2 instruction intrinsics, which aren't supported in > the > default config I have. I tried to remedy this by replacing the intrinsics > with > the __builtin macros, but it was pointed out (correctly), that this doesn't > work > properly. So this is my second attempt, which I actually like a bit better. > I > noted that code that uses intrinsics (ixgbe and the acl library), don't need > to > have those instructions turned on build-wide. Rather, we can just enable the > instructions in the specific code we want to build with support for that, and > test for instruction support dynamically at run time. This allows me to build > the dpdk for a generic platform, but in such a way that some optimizations can > be used if the executing cpu supports them at run time. > > Change notes: > > v2) > * Added Log messages to run time check failures per Konstantin > * Removed run time check caching in acl per Konstantin > > Signed-off-by: Neil Horman <nhorman at tuxdriver.com> > CC: Thomas Monjalon <thomas.monjalon at 6wind.com> >
One possible change to look at - the _mm_shuffle_epi8 is something that is available all the way from SSSE3, so you should be able to leave that in. The SSE4.2 dependency is only for the popcount (and __builtin_popcountll will work for that anyway). That should make things simpler. -Venky
