I believe the instsize is this case is just how many byte the CPU reads at a time when trying to assemble a variable length instruction, but someone familiar with x86/gem5 would have a better response.
Ali On 01.07.2013 09:22, Xiangyang Guo wrote: > Hi, Ali, > > Thanks for explain. This makes sense. > > Could I ask another question? I notice the default mode of X86 is X86-64, so the inst size is 64 bits. Does Gem5 support other mode like compatibility mode ? I tried to modify the configuration in process.cc and decoder file. But it seems cannot change the inst size to variable length. Thanks for attention. > > Regards > > Xiangyang > > On Mon, Jul 1, 2013 at 12:37 AM, Ali Saidi <[email protected]> wrote: > >> There are things other than the explicit source registers that need to be accounted for (for example flag registers). >> >> Ali >> >> On Jun 30, 2013, at 3:08 PM, Xiangyang Guo <[email protected]> wrote: >> >> > Hi, Deal all, >> > >> > I use SE mode, ARM ISA and O3 cpu. I print out the num_src_regs, "unsigned num_src_regs = inst->numSrcRegs(); " (src/cpu/o3/rename_impl.hh) in the function DefaultRename<Impl>::renameSrcRegs(DynInstPtr &inst, ThreadID tid), and I find an intertesting thing: the number of source regs are something like 3 or 4 or 5 or 6. Then I use X86 ISA and do the same thing, and the source regs are even something like 8. >> > >> > So I think maybe I misunderstand something, because I think the num of source regs in one inst should be smaller. so could anyone explain this? Thanks in advance. In addition, just want to confirm, form my understanding, the renamed inst is micro inst? >> > >> > Regards >> > >> > Xiangyang > _______________________________________________ >> > gem5-users mailing list >> > [email protected] >> > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users [1] >> >> _______________________________________________ >> gem5-users mailing list >> [email protected] >> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users [1] > > _______________________________________________ > gem5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users [1] Links: ------ [1] http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
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