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] > <mailto:[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] <mailto:[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] > <mailto:v8-dev%[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.
