Function

Summary

Rounds the given float to single-precision format (32 bits) and returns it as a double-float (64 bits).

Package

lispworks

Signature

round-to-single-precision float => double-float

Arguments

float

A float

Values

double-float

A double-float with single-float precision.

Description

The argument is rounded to single-precision format (32 bits) and returned as a double-float (64 bits). This function allows you to model the rounding behaviour of a machine or implementation that performs 32-bit floating point arithmetic.

The default size on Windows and Linux is 64 bits as specified by the IEEE standard.

LispWorks supports 3 floating point formats, short-float , single-float and double-float . If this function is called with a single-float or a short-float , it returns the equivalent double-float , that is, it is the same as doing
(coerce float 'double-float)

Compatibility Note

LispWorks 4.4 and previous on Windows and Linux platforms supports just one floating point format. In LispWorks 5.0 and later, three floating point formats are supported on all platforms.

Example

CL-USER 197 > pi

3.141592653589793D0

CL-USER 198 > round-to-single-precision pi

3.1415927410125732D0