On Fri, Sep 06, 2002 at 09:28:28PM -0400, Kenneth Culver wrote: > Athlon XP processors support SSE instructions, but not at the same > time as 3dnow instructions. The processor has to switch modes or > something like that. What if a user wants to actually use the 3dnow > instructions? Does this mean that on an athlon XP which supports SSE > instructions, if you don't want to enable them you'll catch SIGILL > and die when using those "certain apps?" Just wondering.
I assume the compiler is not stupid enough to try and use both when that is impossible. Don't forget this is all just passing a CPU name to gcc which actually decides what instructions to use. Kris
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