digitalmars.D - MPIR lib
- bearophile (5/5) Jun 28 2010 This is derived from the GNU multiprecision libs:
- Walter Bright (2/5) Jun 28 2010 No, LGPL is not a Boost compatible license. It is considerably more rest...
- Michel Fortin (10/17) Jun 28 2010 I've used MAPM in the past, it worked well for what I did. The license
- Steven Schveighoffer (4/17) Jun 28 2010 What's wrong with d2's bigint that Don has written?
- bearophile (5/6) Jun 28 2010 MPIR is "not invented here" :-) Moving part of the development of a very...
- Steven Schveighoffer (6/25) Jun 28 2010 OK, I thought you meant we should discard the current bigint in favor of...
- BCS (6/17) Jun 28 2010 If I'm remembering correctly who's who, it reasonably likely that Don ha...
This is derived from the GNU multiprecision libs: http://www.mpir.org/ It has LGPL licence, is this usable as implementation of D2 bigint? Bye, bearophile
Jun 28 2010
bearophile wrote:This is derived from the GNU multiprecision libs: http://www.mpir.org/ It has LGPL licence, is this usable as implementation of D2 bigint?No, LGPL is not a Boost compatible license. It is considerably more restrictive.
Jun 28 2010
On 2010-06-28 16:22:47 -0400, Walter Bright <newshound2 digitalmars.com> said:bearophile wrote:I've used MAPM in the past, it worked well for what I did. The license is much less restrictive, but is still a little more than boost's. But perhaps there's a chance someone can convince the author to make it boost-compatible. It can do arbitrary precision ints and floats. http://www.tc.umn.edu/~ringx004/mapm-main.html -- Michel Fortin michel.fortin michelf.com http://michelf.com/This is derived from the GNU multiprecision libs: http://www.mpir.org/ It has LGPL licence, is this usable as implementation of D2 bigint?No, LGPL is not a Boost compatible license. It is considerably more restrictive.
Jun 28 2010
On Mon, 28 Jun 2010 17:36:19 -0400, Michel Fortin <michel.fortin michelf.com> wrote:On 2010-06-28 16:22:47 -0400, Walter Bright <newshound2 digitalmars.com> said:What's wrong with d2's bigint that Don has written? -Stevebearophile wrote:I've used MAPM in the past, it worked well for what I did. The license is much less restrictive, but is still a little more than boost's. But perhaps there's a chance someone can convince the author to make it boost-compatible. It can do arbitrary precision ints and floats. http://www.tc.umn.edu/~ringx004/mapm-main.htmlThis is derived from the GNU multiprecision libs: http://www.mpir.org/ It has LGPL licence, is this usable as implementation of D2 bigint?No, LGPL is not a Boost compatible license. It is considerably more restrictive.
Jun 28 2010
Steven Schveighoffer:What's wrong with d2's bigint that Don has written?MPIR is "not invented here" :-) Moving part of the development of a very tricky part of code full of long asm routines (see their amount of code finely tuned for different CPUs) to someone else that has more resources and dedication is sometimes positive. It frees Don to do something else for D, allows to use potentially less buggy code (because more people use the same lib), and MPIR contains several good numerical algos and numeric types that are missing in Don's bigint. By the way, even if MPIR gets a Boost licence some work can be useful to adapt it to D, because in D I'd like the multi-precision integrals to be very efficient even when they are used with numbers about 32 bits long or less, so in some programs they can be a replacement of normal integers. This can be done using an union with a tag and switching to normal integer operations when numbers are small (in this case zero memory is allocated on the heap to keep such numbers). I don't know if MPIR is already performing this optimization, I think it is not (I have asked this small-number optimization in Don's bigints too in past, and I think he likes this idea). Bye, bearophile
Jun 28 2010
"Steven Schveighoffer" <schveiguy yahoo.com> On Mon, 28 Jun 2010 18:18:46 -0400, bearophile <bearophileHUGS lycos.com> wrote:Steven Schveighoffer:OK, I thought you meant we should discard the current bigint in favor of some other implementation. I wasn't aware that D2's bigint still had missing features (I haven't used it). -SteveWhat's wrong with d2's bigint that Don has written?MPIR is "not invented here" :-) Moving part of the development of a very tricky part of code full of long asm routines (see their amount of code finely tuned for different CPUs) to someone else that has more resources and dedication is sometimes positive. It frees Don to do something else for D, allows to use potentially less buggy code (because more people use the same lib), and MPIR contains several good numerical algos and numeric types that are missing in Don's bigint. By the way, even if MPIR gets a Boost licence some work can be useful to adapt it to D, because in D I'd like the multi-precision integrals to be very efficient even when they are used with numbers about 32 bits long or less, so in some programs they can be a replacement of normal integers. This can be done using an union with a tag and switching to normal integer operations when numbers are small (in this case zero memory is allocated on the heap to keep such numbers). I don't know if MPIR is already performing this optimization, I think it is not (I have asked this small-number optimization in Don's bigints too in past, and I think he likes this idea).
Jun 28 2010
Hello bearophile,Steven Schveighoffer:If I'm remembering correctly who's who, it reasonably likely that Don had a hand in some of the code one or the other of those libs. Someone around here has contributed to some high performance numerics libs. -- ... <IXOYE><What's wrong with d2's bigint that Don has written?MPIR is "not invented here" :-) Moving part of the development of a very tricky part of code full of long asm routines (see their amount of code finely tuned for different CPUs) to someone else that has more resources and dedication is sometimes positive. It frees Don to do something else for D, allows to use potentially less buggy code (because more people use the same lib), and MPIR contains several good numerical algos and numeric types that are missing in Don's bigint.
Jun 28 2010
BCS wrote:Hello bearophile,I have never contributed to any non-D libs.Steven Schveighoffer:If I'm remembering correctly who's who, it reasonably likely that Don had a hand in some of the code one or the other of those libs. Someone around here has contributed to some high performance numerics libs.What's wrong with d2's bigint that Don has written?MPIR is "not invented here" :-) Moving part of the development of a very tricky part of code full of long asm routines (see their amount of code finely tuned for different CPUs) to someone else that has more resources and dedication is sometimes positive. It frees Don to do something else for D, allows to use potentially less buggy code (because more people use the same lib), and MPIR contains several good numerical algos and numeric types that are missing in Don's bigint.
Jul 11 2010
Hello Don,BCS wrote:http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel Close enought for my point, (unless the Don referenced there isn't you). -- ... <IXOYE><Hello bearophile,I have never contributed to any non-D libs.Steven Schveighoffer:If I'm remembering correctly who's who, it reasonably likely that Don had a hand in some of the code one or the other of those libs. Someone around here has contributed to some high performance numerics libs.What's wrong with d2's bigint that Don has written?MPIR is "not invented here" :-) Moving part of the development of a very tricky part of code full of long asm routines (see their amount of code finely tuned for different CPUs) to someone else that has more resources and dedication is sometimes positive. It frees Don to do something else for D, allows to use potentially less buggy code (because more people use the same lib), and MPIR contains several good numerical algos and numeric types that are missing in Don's bigint.
Jul 11 2010