[cfp-interest 3756] JTC1/SC22/WG14/CFP 2026/01/07 Meeting notes

Thu Jan 8 11:32:55 PST 2026

2026/01/07: 8:00 AM PDT/:00 PM UTC
[Please submit proposed changes to these minutes to Jerome or to the group.
Revision changes appear at the bottom.]

*Attendees*

    Jim Thomas, Rajan Bhakta, Jerome Coonen, Damian McGuckin, Joshua
Cranmer, Tue Ly, David Hough

*Updated agenda plus new items*

    https://wiki.edg.com/pub/CFP/WebHome/n3775.pdf – These minutes should
be read alongside the agenda, with its many reference links.

*Previous meeting notes*

   https://wiki.edg.com/pub/CFP/WebHome/n3774.pdf 2025/11/12 Meeting notes

*Study group logistics*

    Next meeting: 18 February 2026, 8:00 AM PST/4:00 PM UTC

    ISO Zoom teleconference

    Please notify the group if this time slot does not work.

    Group: Will work to avoid the new Wed. 754 meetings.

*C documents*

    The latest C2Y draft is N3685 Sept. 2025
https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3685.pdf

    C23 has been published ISO/IEC 9899, available for purchase.
https://www.iso.org/standard/82075.html

*IEEE 754 liaison*

    Damian: Still working on formats. Nothing to report on complex, but
hoping to get that conversation gong.

*C++ liaison*

    None

*WG14 update*

    Rajan: Next meetings 2-6 Feb 2026, and then 9-13 March 2026. Nominal
email deadline is 1 month in advance of a meeting.

    Jim: Requests email from Rajan with any needs for these meetings.

*TS-4 and TS-5 revisions*

    None.

*News*

    None

*Carryover action items from last meeting *

   None

*Action items from last meeting *
    Group: Review Jim's latest doc (to be released) on rounding precision
mode and be prepared to review.
        Discussion

    Jim & Jerome: Investigate Joseph Meyers's issue of the conflicting
requirements for double_t to be either double or long double.
        Carryover

    Damian & Jerome: Look at +/-0 in fromfp, and also the case of a value
rounding to zero.
        Carryover

    Jim & Rajan: Send email to JeanHeyd about the editorial change of
"function value to "result". Include mention of the move of the SNAN macro,
which was not recorded in Annex M. Third, recommend the wording in cfp3688
wording with "...of the return type..."
        Done, forwarded to CFP

    Fred: Send Rajan wording for the previous action, re. the moving of the
SNAN macros.
        Done

    Damian: Remember to update the date in new drafts of the working
documents. (Public reminder in the holiday spirit.)
        Damian: Left the dates as they were. Some need more input, so
holding off on update.
        Jim: Need to be able to reference specific versions of docs,
notably the big Annex F discussion.
        Discussion

    Jim & group: Review trunc and canonicalize in Damian's Annex F update
to come.
        Done

    Group: Review the rounding direction language, with Jim to provide an
email to kick things off.
        Done

    Group: Think about where CFP is headed.
        Discussion & carryover

*Discussion of issues*
    References to rounding precision mode, etc.
        Jim: Reviews mail mentioning obsolete modes -- precision and
trapping. Decimal is not accounted for. Describes changes to repair the
issues.
        Rajan: Does anyone use the decimal default nearest with ties away
from zero? Takes action to ask Mike Cowlishaw.
        Jim: Will change usage to "with ties away from zero" vs. "<comma>
ties away from zero".
        Damian: Can we have a few weeks for review?
        Jim: Will send update with a short timeline for review. Action.

    Conflicting requirements for double_t
        Deferred

    Sign of zero from fromfp functions
         Deferred

    Annex F proposal update
        Jim: Suggest changing the date (and version) with each revision.
        Damian: On p. 2, confirms that the hyphen/minus is correct. Reviews
the tricky cases of finite y, all numeric y, and when NaN is included.
        Jim: The proposal is going to be big. Will have to consider how to
present this proposal in a what that WG14 can deal with it.

    Annex F trunc
        Group: Need to rework the language of "toward zero".
        Jim: Proposes unifying the language of ceil, floor, trunc, round,
roundeven.
        Damian: Will pursue that angle.

    Annex F canonicalize
        Jim: Text needs to refer to "the" canonical NaN, using the definite
article. Suggests using the 60559 terminology "quieted NaN", with quotes to
call out the rare mention of signaling NaN.

    Minus signs and hyphens
        Jim: Reviews his explanatory email.

    More Annex F special cases
        Jim: We have a stream of emails about special cases.
        Jerome: Suggests the example of pow(2.0, 3.0), which one would
expect to be 8.0, but may not arise from the "obvious" formulation
exp(log(2.0) * 3.0).
        Damian: Action to contact Fred about cases he knows.

    Editorial issues F.2.2
        Damian: Requests feedback on this and subsequent two items.
        Jim: There is an issue of whether to send feedback to all CFP or
the just the most interested folks. In this case, only Jerome requests to
be included.

    Editorial issues F.3, etc.
        See above.

    Editorial issues F.10.1
        See above.

    Rounding direction language
        Jim: Reviews his email to kick off the discussion.
        Group: Revisit in February with an eye to an action to fix some or
all of the cases needing attention.

    CFP future
        Jim: Carrover

    Incorrect change to symbols in F.9.4
        Jim: Points out numerous cases where C expressions were changed to
mathematical expressions during a revision of the draft, but with no
apparent call for the change.
        Jim & Rajan: There is precedent to backing out the mistaken changes
in GitHub. Rajan may be the only active CFP member qualified to make such
changes, but permission is another matter and the extent of the changes
suggests that a clean fix might be better.
        Group: This involves "just" sections F.9.3 and F.9.4, but the the
changes are numerous and they are subtle. (See the mention of hyphens and
minus signs above for a taste of the issue.) There are C expressions that
ought to be in code face. And there are C-like expressions but with
mathematical placeholders, in which case the operators are C operators in
code face and the placeholders are mathematical.
    Jim: Action to draft suggestion for dealing with this.

*Other issues*
    None

*Adjournment*

    10:00 AM PDT

-----------------------------------------------

*Action items to be carried over*
    Jim & Jerome: Investigate Joseph Meyers's issue of the conflicting
requirements for double_t to be either double or long double.

    Damian & Jerome: Look at +/-0 in fromfp, and also the case of a value
rounding to zero.

    Group: Think about where CFP is headed.

*New action items*

      Rajan: Send email to Mike Cowlishaw asking whether anyone uses the
ties away from zero as the default in decimal. Share with group.

    Jim: Send updated rounding language doc with timeline for comments
allowing submission for the March WG14 meeting.

    Damian: Contact Fred about extending the list of exact special cases in
Annex F.

    Jim: Draft a suggestion for approaching the fixes to symbols.

*Signoff*
    Respectfully submitted, with wishes for a peaceful, productive,
not-too-compliant 2026!

-Jerome Coonen
 650.996.4738
 jcoonen at gmail.com
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