Messages in this thread | | | Date | Fri, 19 Apr 2002 23:42:06 +0200 | From | Andi Kleen <> | Subject | Re: SSE related security hole |
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On Fri, Apr 19, 2002 at 02:35:57PM -0700, H. Peter Anvin wrote: > >> > >> 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.
That's also why I like it.
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