> I'm trying to use SSE2 and SSSE3 intrinsics on some old hardware. The > program performs its own CPUID checks, so it knows when it can enter a > particular code path. > > The program is compiled with -march=native, but the machine lacks > SSSE3 and above. It causing the compile to fail. > > I recall seeing a GCC bug report that enabled intrinsics all time, > regardless of the machine's features. I can no longer locate the bug > report, so I don't know which version of GCC supports the feature. > > My question is, which version of GCC supports intrinsics independent of -mXXX? Its supposed to be GCC 4.9, but I don't believe it works as reported. The intrinsics are not available in GCC 5.4 (maybe something changed). Here is the issue: "Please make the intrinsics headers like immintrin.h be usable without compiler flags", https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57202. Jeff
