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Re: Can Java compute 9^(9^9) ?

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Checked latest Spire/Scala. 
https://github.com/non/spire

No FFT multiplication found, right?
But otherwise looks fun.

Am Montag, 11. Juni 2018 22:20:46 UTC+2 schrieb burs...@gmail.com:
> OCaml seems to now simply hook on GMP.
> 
> https://github.com/ocaml/Zarith
> 
> Maybe Java should also hook on GMP?
> 
> Just joking...
> 
> Am Montag, 11. Juni 2018 03:17:16 UTC+2 schrieb Arne Vajhøj:
> > On 6/10/2018 6:48 PM, bursejan@gmail.com wrote:
> > > Am Montag, 11. Juni 2018 00:29:14 UTC+2 schrieb Arne Vajhøj:
> > >> On 6/10/2018 5:31 AM, bursejan@gmail.com wrote:
> > >>> Am Sonntag, 10. Juni 2018 11:13:19 UTC+2 schrieb Martin Gregorie:
> > >>>> On Sat, 09 Jun 2018 23:29:53 +0000, Volker Borchert wrote:
> > >>>>> j4n bur53 wrote:
> > >>>>>> Interestingly IBM, also for their new POWER9,
> > >>>>>> still provides BCD coding support.
> > >>>>>
> > >>>>> Is it part of ANSI COBOL?
> > 
> > >>> Packed BCD is supported in the COBOL programming
> > >>> language as the "COMPUTATIONAL-3" (an IBM
> > >>> extension adopted by many other compiler
> > >>> vendors) or "PACKED-DECIMAL" (part of the
> > >>> 1985 COBOL standard) data type. It is
> > >>> supported in PL/I as "FIXED DECIMAL". Besides
> > >>> the IBM System/360 and later compatible
> > >>> mainframes, packed BCD is implemented
> > >>> in the native instruction set of the
> > >>> original VAX processors from Digital
> > >>> Equipment Corporation and some models
> > >>> of the SDS Sigma series mainframes, and
> > >>> is the native format for the Burroughs
> > >>> Corporation Medium Systems line of
> > >>> mainframes (descended from the 1950s
> > >>> Electrodata 200 series).
> > >>
> > >> Note that there is a difference between supporting
> > >> BCD format in memory and having the CPU support it.
> > >>
> > >> Systems supporting BCD format in memory can process
> > >> them in 3 different ways:
> > >> 1) BCD instructions in the ISA implemented in actual
> > >>      silicium
> > >> 2) BCD instructions in the ISA implemented in
> > >>      micro-code
> > >> 3) non-BCD instructions
> > >>
> > >> All will support COBOL COMP-3 fine.
> > >>
> > >> #1 will be fastest, so if COBOL COMP-3 is a huge
> > >> part of the actual workload for a given computer
> > >> architecture then it makes sense.
> >  >
> > > For VAX it was possibly option 2), at least
> > > wikipedia says:
> > > 
> > >      Architectures with instruction sets
> > >      implemented by complex microprograms
> > >      included the IBM System/360 and Digital
> > >      Equipment Corporation VAX.
> > >      https://en.wikipedia.org/wiki/Microcode
> > > 
> > > And the instructions were so called decimal
> > > string instructions, I guess:
> > > 
> > > Decimal =	Decimal instruction group
> > > 
> > > 		ADDP4	ADDP6	ASHP	CMPP3	CMPP4
> > > 		CVTLP	CVTPL	CVTPS	CVTPT	CVTSP
> > > 		CVTTP	DIVP	MOVP	MULP	SUBP4
> > > 		SUBP6
> > > 
> > > Because there is always a length parameter,
> > > I guess option 1) does not really exist. At
> > > least if the aim is decimal strings.
> > 
> > Yes - VAX xxxP is BCD.
> > 
> > Length is necessary as there is a need to support different
> > lengths.
> > 
> > I would think even a pure silicium solution would need
> > that.
> > 
> > Arne

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Thread

Can Java compute 9^(9^9) ? bursejan@gmail.com - 2018-06-01 10:20 -0700
  Re: Can Java compute 9^(9^9) ? Eric Sosman <esosman@comcast-dot-net.invalid> - 2018-06-01 13:36 -0400
    Re: Can Java compute 9^(9^9) ? j4n bur53 <janburse@fastmail.fm> - 2018-06-01 20:20 +0200
      Re: Can Java compute 9^(9^9) ? bursejan@gmail.com - 2018-06-05 07:17 -0700
        Re: Can Java compute 9^(9^9) ? bursejan@gmail.com - 2018-06-05 07:29 -0700
          Re: Can Java compute 9^(9^9) ? bursejan@gmail.com - 2018-06-05 07:48 -0700
          Re: Can Java compute 9^(9^9) ? Eric Sosman <esosman@comcast-dot-net.invalid> - 2018-06-05 10:57 -0400
            Re: Can Java compute 9^(9^9) ? bursejan@gmail.com - 2018-06-05 09:32 -0700
              Re: Can Java compute 9^(9^9) ? Eric Sosman <esosman@comcast-dot-net.invalid> - 2018-06-05 13:58 -0400
                Re: Can Java compute 9^(9^9) ? bursejan@gmail.com - 2018-06-05 11:10 -0700
                Re: Can Java compute 9^(9^9) ? bursejan@gmail.com - 2018-06-05 11:21 -0700
                Re: Can Java compute 9^(9^9) ? Andreas Leitgeb <avl@logic.at> - 2018-06-06 08:50 +0000
                Re: Can Java compute 9^(9^9) ? bursejan@gmail.com - 2018-06-06 01:58 -0700
                Re: Can Java compute 9^(9^9) ? bursejan@gmail.com - 2018-06-06 02:01 -0700
                Re: Can Java compute 9^(9^9) ? bursejan@gmail.com - 2018-06-06 10:34 -0700
  Re: Can Java compute 9^(9^9) ? j4n bur53 <janburse@fastmail.fm> - 2018-06-09 21:06 +0200
    Re: Can Java compute 9^(9^9) ? v_borchert@despammed.com (Volker Borchert) - 2018-06-09 23:29 +0000
      Re: Can Java compute 9^(9^9) ? Martin Gregorie <martin@mydomain.invalid> - 2018-06-10 09:13 +0000
        Re: Can Java compute 9^(9^9) ? bursejan@gmail.com - 2018-06-10 02:31 -0700
          Re: Can Java compute 9^(9^9) ? Arne Vajhøj <arne@vajhoej.dk> - 2018-06-10 18:28 -0400
            Re: Can Java compute 9^(9^9) ? bursejan@gmail.com - 2018-06-10 15:48 -0700
              Re: Can Java compute 9^(9^9) ? bursejan@gmail.com - 2018-06-10 15:52 -0700
                Re: Can Java compute 9^(9^9) ? bursejan@gmail.com - 2018-06-10 15:58 -0700
              Re: Can Java compute 9^(9^9) ? Arne Vajhøj <arne@vajhoej.dk> - 2018-06-10 21:17 -0400
                Re: Can Java compute 9^(9^9) ? bursejan@gmail.com - 2018-06-11 13:20 -0700
                Re: Can Java compute 9^(9^9) ? bursejan@gmail.com - 2018-06-14 13:37 -0700

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