Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 9/08/2022
Public

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Document Table of Contents

rcd, Qrcd

Enables fast float-to-integer conversions. This is a deprecated option that may be removed in a future release. This feature is only available for ifort.

Syntax

Linux:

-rcd

macOS:

-rcd

Windows:

/Qrcd

Arguments

None

Default

OFF

Floating-point values are truncated when a conversion to an integer is involved.

Description

This option enables fast float-to-integer conversions. It can improve the performance of code that requires floating-point-to-integer conversions.

This is a deprecated option that may be removed in a future release. There is no replacement option.

The system default floating-point rounding mode is round-to-nearest. However, the Fortran language requires floating-point values to be truncated when a conversion to an integer is involved. To do this, the compiler must change the rounding mode to truncation before each floating-point-to-integer conversion and change it back afterwards.

This option disables the change to truncation of the rounding mode for all floating-point calculations, including floating point-to-integer conversions. This option can improve performance, but floating-point conversions to integer will not conform to Fortran semantics.

IDE Equivalent
None
Alternate Options

Linux and macOS: None

Windows: /QIfist (this is a deprecated option)