> And therein lies the problem: x86-64 instruction set isn't compatible with IA64 instruction set
That is exactly what we are talking about: it's instruction set that is the issue, not the amount of bits (32 vs. 64). Vyacheslav Egorov On Sat, Apr 27, 2013 at 6:18 PM, Jeffrey Chimene <[email protected]> wrote: > On 4/27/2013 9:14 AM, Rodolph Perfetta wrote: > > In 2009 v8 didn't have a 64bits port, now as mentioned by Vyacheslav, it > has (for intel x86-64). So the amount of bits is not a problem. > > > And therein lies the problem: x86-64 instruction set isn't compatible with > IA64 instruction set > > > > On 27 April 2013 16:29, Jeffrey Chimene <[email protected]> wrote: > >> On 4/27/2013 8:17 AM, Vyacheslav Egorov wrote: >> >> Amount of bits is not an issue here at all, for example V8 already runs >> on x86-64 just fine. >> >> I should have been clearer. I'm referring to a thread from 2009 >> >> https://groups.google.com/forum/#!searchin/v8-dev/ia64/v8-dev/GuP1ZlPVIpE/uUUNjmXCJ-wJ >> >> Making V8 work on 64-bits is much much bigger than changing some types >> around and changing the scons. It probably deserves some fairly big >> design discussions, and I would guess it would take at least a few >> months, and it will be hard not to fracture the code a bunch, with >> separate code for 32/64 bit (GC, object layout, etc). >> >> >> and in reply >> >> I'm certainly not expecting that type changes will magically make this >> code 64-bit clean. If that were true, it would've been done already. >> >> If it would be better, I can do these changes out of tree and come back >> with things when I have them working. My question from the previous email >> is whether or not generic changes would be accepted into the tree or not - >> if the answer is no, that's fine. >> >> >> Despite confusingly similar names ia32 and IA64 (Itanium) are *very* >> different architectures. >> >> Agreed. The mode on the IA64 that executes 32 bit instructions isn't >> available on VMS >> >> >> >> I'd say generating efficient code for IA64 is much harder because >> compiler has to carefully schedule instructions in instruction bundles >> (IA64 is VLIW) to saturate execution units and avoid dreadful stalls. >> >> Agreed. That may be why IA64 hasn't been produced. OTOH. it may be that >> the V8 code isn't 64-bit clean. >> >> >> [though I heard that newest Itanium micro-architecture actually is more >> forgiving to poor scheduling and is capable of a good built-in out-of-order >> execution, but I am not closely following this things so I might be wrong] >> >> >> >> >> >> Vyacheslav Egorov >> >> >> On Sat, Apr 27, 2013 at 4:50 AM, <[email protected]> wrote: >> >>> Hi Folks, >>> >>> I'd like to spearhead a port to IA64 on OpenVMS, which does not support >>> IA32 subset. Am I correct that this is a deal breaker in that true 64 bit >>> is a major initiative? >>> -- >>> -- >>> v8-dev mailing list >>> [email protected] >>> http://groups.google.com/group/v8-dev >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "v8-dev" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >>> >>> >> >> -- >> -- >> v8-dev mailing list >> [email protected] >> http://groups.google.com/group/v8-dev >> --- >> You received this message because you are subscribed to a topic in the >> Google Groups "v8-dev" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/v8-dev/HnPDu-HygB4/unsubscribe?hl=en. >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> >> >> -- >> -- >> v8-dev mailing list >> [email protected] >> http://groups.google.com/group/v8-dev >> --- >> You received this message because you are subscribed to the Google Groups >> "v8-dev" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> > > -- > -- > v8-dev mailing list > [email protected] > http://groups.google.com/group/v8-dev > --- > You received this message because you are subscribed to a topic in the > Google Groups "v8-dev" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/v8-dev/HnPDu-HygB4/unsubscribe?hl=en. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > > > > > -- > -- > v8-dev mailing list > [email protected] > http://groups.google.com/group/v8-dev > --- > You received this message because you are subscribed to the Google Groups > "v8-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- -- v8-dev mailing list [email protected] http://groups.google.com/group/v8-dev --- You received this message because you are subscribed to the Google Groups "v8-dev" group. 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