Adam Back wrote:
On Tue, Aug 03, 2004 at 01:11:34PM -0400, Hubert Chan wrote:
Jonathan> a Pentium-MMX and K6 upwards (but not a Pentium Pro), and will Jonathan> almost certainly be the fastest cores available (at least Jonathan> until someone writes an SSE2 version).
OK, just to double-check, to enable the MMX core, I just need to use the -mmmx flag, and if it runs on a non-MMX machine, it won't use the MMX instructions, right?
> I think I found when trying this kind of thing earlier that you get a > core dump if it runs on hardware that does not have feature you are > asking for. > > There is a difference between optimize for pentium (but still run on > 486), and use SSE instructions; if the instructions are not there, > unlike floating point there is no emulation / alternate code managed > by compiler and it just bombs!
---eric
