Issue 0CFP.18: P4: missing specification of preferred quantum exponents

This issue has been automatically converted from the original issue lists and some formatting may not have been preserved.

Authors: WG14, C Floating Point Group
Date: 2018-02-22
Reference document: N2204
Submitted against: Floating-point TS 18661 (C11 version, 2014-2016)
Status: Fixed
Fixed in: C23, Floating-point TS 18661-4:2025
Converted from: n2397.htm

Summary

TS 18661-4 neglected to specify the preferred quantum exponent for its new functions. This was an oversight. The following suggested TC adds the missing specification.

Suggested Technical Corrigendum

In TS 18661-4, at the end of clause 7, append:

In the Preferred Quantum Exponents table in 5.2.4.2.2a#7, insert before the final row:
c rsqrt −floor(Q(x)/2)
c compoundn floor(n × min(0, Q(x)))
c rootn floor(Q(x)/n)
c pown floor(n × Q(x))
c powr floor(y × Q(x))

In TS 18661-4, at the end of clause 8, append:

In the Preferred Exponents Table in 5.2.4.2.2a#7, append:
reduction functions unspecified

Comment from WG14 on 2018-10-18:

Apr 2018 meeting

Committee Discussion

The committee accepted the Suggested Technical Corrigendum as the Proposed Change (using our new terminology).

Proposed Change

In TS 18661-4, at the end of clause 7, append:

In the Preferred Quantum Exponents table in 5.2.4.2.2a#7, insert before the final row:
c rsqrt −floor(Q(x)/2)
c compoundn floor(n × min(0, Q(x)))
c rootn floor(Q(x)/n)
c pown floor(n × Q(x))
c powr floor(y × Q(x))

In TS 18661-4, at the end of clause 8, append:

In the Preferred Exponents Table in 5.2.4.2.2a#7, append:
reduction functions unspecified