On 4/20/11 1:59 PM, Jerry James wrote: > I'm packaging a library that does some heavy mathematical > computations. The build system tries to cleverly determine whether an > Intel CPU with vector instructions is being used. Until I can > convince upstream to do this at runtime, I'll need to build the > package (a library) for the lowest common denominator. The package > checks for MMX, SSE, SSE2, SSE3, and SSSE3. For i686, can I assume > MMX? SSE? The least capable processor we've gone out of our way to fix things for is the AMD Geode GX, which has MMX and 3DNow, but is also slightly less than a proper Pentium Pro in that it doesn't have nopl or cmov. However, rpm sets --march=i686, which implies only Pentium Pro and does not imply MMX or anything newer. Not that I know of anyone who's tried running Fedora on a bare i686 in recent memory. > I believe I can also build an SSE2 version of the library > and drop it into /usr/lib/sse2. How about for x86_64? Can I assume > SSE2 is available? (I thought I could, but I see that /usr/lib64/sse2 > exists on my machine, so now I'm uncertain.) I don't see a > /usr/lib64/sse3 or /usr/lib64/ssse3, so I just have to forget those, > right? All AMD64 and compatible chips support SSE and SSE2, correct. I'm reasonably sure that path is simply for symmetry with i686 in case some application was relying on it. - ajax -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
