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Floating point type long double is only 64 bit wide

This document (3112880) is provided subject to the disclaimer at the end of this document.

Environment

Novell SUSE Linux Enterprise Server 9 for S/390 and IBM zSeries
Novell SUSE Linux Enterprise Server 9 for IBM zSeries

Situation

The size of the long double floating point type on Novell SUSE Linux Enterprise Server 9 for IBM mainframes is only 64 bit.

Resolution

The C compiler GCC-3.3 which has been used to build SLES9 only supports IEEE 754 floating point values with a word size of 64 bit. Thus, the type long double has the same size as the regular double type. As the size of double is implementation specific and the size of long double just needs to be larger or equal than double, the implementation is conforming to C99.

GCC-4-1on SLES10 implements the extended binary floating point type with a word size of 128 bit for long double.

Disclaimer

This Support Knowledgebase provides a valuable tool for NetIQ/Novell/SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:3112880
  • Creation Date:25-JUN-07
  • Modified Date:27-APR-12
    • SUSESUSE Linux Enterprise Server

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