Messages in this thread | | | Date | Fri, 19 Apr 2002 14:35:57 -0700 (PDT) | Subject | Re: SSE related security hole | From | "H. Peter Anvin" <> |
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>> >> Ummm...last I knew, fxrstor is *expensive*. The fninit/xor regs setup >> is likely *very* much faster. Someone should check this before we >> sacrifice 100 cycles needlessly or something. > > most probably yes, fxrestor needs to read ram, pxor also takes some > icache and bytecode ram but it sounds like it will be faster. > > Maybe we could also interleave the pxor with the xorps, since they uses > different parts of the cpu, Honza? >
You almost certainly should. The reason I suggested FXRSTOR is that it would initialize the entire FPU, including any state that future processors may add, thus reducing the likelihood of any funnies in the future.
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