Submitter: Joseph Myers
Submission Date: 2013-07-21
Source: WG 14
Reference Document: N1730
Date: April 2014
Subject: Floating-point issues in C11 from PDTS 18661-1 UK review, Issue 4
SummarySome issues with floating point in C11 have been identified as part of the UK review of the N1711 draft of TS 18661-1. While such issues relate to the general area of C bindings to IEC 60559:2011, and so could be addressed in the TS on that basis, since the issues also apply to C11 as-is it may be more appropriate to address some or all of these issues as Defect Reports with a view to having a normative fix in a future TC to C11 rather than only having a fix in conjunction with the new bindings.
Issue 4: Floating-point state not being an object
The description of the floating-point environment in C11 fails to make sufficiently clear what is or is not an object (C11 footnote 205 is not normative, and so cannot be used to that effect); it uses terms such as "system variable" without saying what that is. Simply moving that footnote to normative text would fix this issue:
Move the contents of footnote 205 (C11 subclause 7.6) to the end of 188.8.131.52#2.
Apr 2014 meeting
The committee discusses this issue further and could not see an actual defect: there are no misinterpretations stated or implied.
Proposed Committee Response
Since operations on the floating point environment are well defined there is no need to normatively define anything further about its implementation. The footnote adds clarity and should remain as is.
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