Re: TR1 Special Math

[Jonathan Wakely <jwakely dot gcc at gmail dot com>]

On 25 October 2015 at 20:48, Jonathan Wakely <jwakely.gcc@gmail.com> wrote:
> On 25 October 2015 at 17:46, Ed Smith-Rowland <3dw4rd@verizon.net> wrote:
>> On 10/24/2015 11:38 PM, Jonathan Wakely wrote:
>>>
>>> On 8 May 2015 at 15:05, Ed Smith-Rowland <3dw4rd@verizon.net> wrote:
>>>>
>>>> On 05/07/2015 12:06 PM, Jonathan Wakely wrote:
>>>>>
>>>>> Hi Ed,
>>>>>
>>>>> The C++ committee is considering the
>>>>> http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4437.pdf
>>>>> proposal to make C++17 include the contents of ISO 29124:2010 (the
>>>>> special math functions from TR1 that went into a separate standard,
>>>>> not into C++11).
>>>>>
>>>>> What is the status of our TR1 implementation? Is it complete? Good
>>>>> enough quality to move out of the tr1 sub-dir?
>>>>>
>>>>> Even if N4437 isn't accepted for C++17 we could move things around to
>>>>> turn the TR1 code into an iso29124 implementation, do you think that
>>>>> would make sense?
>>>>>
>>>> That would make absolute sense.
>>>> I actually have a tree where I've done that.
>>>> All the functions are in there (29124 removed the hypergeometric
>>>> functions.
>>>> I'd like to keep those as extensions.
>>>> I have some bugfixes also.
>>>>
>>>> I have a better version of the Carlson elliptic functions (which are used
>>>> in
>>>> the 29124 elliptic functions).
>>>>
>>>> Ed
>>>>
>>> Hi Ed, Florian,
>>>
>>> Here's a patch to re-use the TR1 math functions to implement IS 29124,
>>> what do you think of this approach? Ed, were you just going to copy
>>> the files and have duplicated code?
>>>
>>> We should probably uglify the names of the hypergeometric functions if
>>> they are not in the final standard.
>>>
>>> This doesn't include Florian's patch, which should be applied.
>>>
>>> (I want to get this done before stage 1 ends in a couple of weeks, so
>>> am posting this for review now, but I'll be unavailable for the next
>>> week or two and might not be able to actually commit anything until
>>> stage 3).
>>
>> Hi all!
>>
>> I am actually very aware of the stage 1 deadline and am working furiously!
>>
>> This patch adds the hypergeometric and confluent hypergeometric functions
>> that were actually stricken fromTR29124.
>> I actually had a mind to add those back especially since the confluent one
>> is actually pretty stable in it's realm and is used in some statistics
>> tests.
>> I expect that some people have ventures to use both and so TR29129 would not
>> be a full replacement for TR1 without them.
>>
>> I intend to post within the next few days.  I have to realize that some of
>> my hopes and dreams would be better done with these in tree! ;-)
>>
>> Thank you for lighting a fire Jonathan!
>
> Excellent, glad to hear you're on this, as you know the code and the
> specs, whereas I'm poking around blindly :-)

Hi Ed,

Have you been able to find enough time to work on this?

Will you be able to make the stage 1 deadline tomorrow, and if not, do
you think I should apply my patch to re-use the TR1 stuff?  (We can
apply Florian's bug fix to that as well).