On Mon, 2010-01-18 at 10:58 -0500, Masami Hiramatsu wrote: > Jim Keniston wrote: > > Not really. For #3 (boosting), you need to know everything for #2, > > plus be able to compute the length of each instruction -- which we can > > now do for x86. To emulate an instruction (#4), you need to replicate > > what it does, side-effects and all. The x86 instruction set seems to > > be adding new floating-point instructions all the time, and I bet even > > Masami doesn't know what they all do, but so far, they all seem to > > adhere to the instruction-length rules encoded in Masami's instruction > > decoder. > > Actually, current x86 decoder doesn't support FP(x87) instructions.(even > it already supported AVX) But I think it's not so hard to add it. >
At one point I verified that it worked for all the x87 instructions in libm: https://www.redhat.com/archives/utrace-devel/2009-March/msg00031.html I'm pretty sure I tested mmx instructions as well. But I guess this was before you rearranged the opcode tables. Yeah, it wouldn't be hard to add back in, at least for purposes of computing instruction lengths. Jim
