ISO/IEC TS 18661-5:2016 PDF

Name: ISO/IEC TS 18661-5:2016 — Information Technology — Programming languages, their environments, and system software interfaces — Floating-point extensions for C — Part 5: Supplementary attributes
SKU: ISO/IEC TS 18661-5:2016
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Information Technology — Programming languages, their environments, and system software interfaces — Floating-point extensions for C — Part 5: Supplementary attributes

Название (английский):

ISO/IEC TS 18661-5:2016

Information Technology — Programming languages, their environments, and system software interfaces — Floating-point extensions for C — Part 5: Supplementary attributes

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 24
Дата публикации:: 11 августа 2016 г.
Издание:: ISO/IEC TS 18661 edition 1 version 1
ICS:: 35.060

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Описание (английский):

ISO/IEC TS 18661-5:2016 extends programming language C to include support for attributes specified and recommended in ISO/IEC/IEEE 60559:2011.

Abstract

Похожие стандарты

Другие стандарты ISO

Overview

ISO/IEC TS 18661-5:2016 - “Information Technology - Floating-point extensions for C - Part 5: Supplementary attributes” - extends the C programming language to support floating-point attributes recommended in ISO/IEC/IEEE 60559:2011 (the updated IEEE 754). The technical specification defines how C implementations expose constant (translation-time) floating‑point semantics via standard pragmas and implementation macros so that programs can declare attributes such as exception handling, evaluation formats, optimization controls and reproducibility guarantees.

Key topics and requirements

Language binding for IEEE 60559 attributes: Provides C-level support for attributes that are recommended by ISO/IEC/IEEE 60559:2011, implemented primarily via standard pragmas.

Standard pragmas: Specifies pragmas to fix floating-point semantics for code blocks at translation time (not runtime). These extend the existing set of C floating-point pragmas.

Evaluation formats: Defines attributes for selecting evaluation formats (e.g., preferredWidth) used when computing intermediate floating-point results.

Optimization controls: Specifies attributes to allow or disallow value-changing optimizations that may alter floating-point results (e.g., transformations that change rounding or evaluation order).

Reproducibility: Introduces attributes to support producing exactly reproducible floating-point results and exception behavior across conforming implementations.

Alternate exception handling: Optional specification for alternate methods of handling floating-point exceptions; implementations that support this must define a specific conformance macro.

Conformance macros: Implementations conforming to this part must meet C11 with TS 18661 parts 1–5 changes, conform to 18661-1 or 18661-2 (binary or decimal), and define STDC_IEC_60559_ATTRIBS to 201607L. Optional alternate exception handling support requires STDC_IEC_60559_ATTRIB_ALTERNATE_EXCEPTION_HANDLING.

Applications and who uses it

ISO/IEC TS 18661-5 is targeted at:

Compiler and toolchain vendors - to implement pragma-based floating-point attributes and provide precise conformance macros.

Numerical library authors and HPC developers - who need controlled evaluation formats, deterministic rounding, and reproducible results across platforms.

Safety‑critical and embedded systems - where predictable exception handling and fixed floating-point semantics are required for certification and auditability.

Financial and decimal-arithmetic applications - when combined with TS 18661-2 for decimal floating-point support.

Standards bodies and language designers - as a reference for C language bindings to IEEE 754/IEC 60559 features.

Related standards

ISO/IEC 9899:2011 (C11) - base C standard extended by TS 18661 series.

ISO/IEC TS 18661-1..4 - companion parts covering binary/decimal formats, interchange and extended types, and supplementary functions.

ISO/IEC/IEEE 60559:2011 (IEEE 754-2008) - floating-point arithmetic standard that defines the attributes this TS implements.

ISO/IEC TR 24732 - earlier decimal floating-point work referenced in the TS series.

Keywords: ISO/IEC TS 18661-5, floating-point extensions for C, supplementary attributes, IEEE 754, IEC 60559, C language floating-point, pragmas, reproducibility, exception handling, evaluation formats.

ISO/IEC TS 18661-5:2016 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and who uses it

Related standards

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