Developer Guide and Reference

Contents

Quiet-Computational Operations Functions

Many routines in the
libbfp754
Library are more optimized for Intel® microprocessors than for non-Intel microprocessors.
The Intel® IEEE 754-2008 Binary Conformance Library supports the following functions for quiet-computational operations:

copy

Description:
The function copies input floating-point number
x
to output in the same floating-point format, without any change to the sign.
Calling interface:
float __binary32_copy(float x);
double __binary64_copy(double x);
When the input is a signaling
NaN
, two different outcomes are allowed by the standard. The operation could either signal invalid exception with quieted signaling
NaN
as output, or deliver signaling
NaN
as output without signaling any exception.

negate

Description:
The function copies input floating-point number
x
to output in the same floating-point format, reversing the sign.
Calling interface:
float __binary32_negate(float x);
double __binary64_negate(double x);
When the input is a signaling
NaN
, two different outcomes are allowed by the standard. The operation could either signal invalid exception with quieted signaling
NaN
as output, or deliver signaling
NaN
as output without signaling any exception.

abs

Description:
The function copies input floating-point number
x
to output in the same floating-point format, setting the sign to positive.
Calling interface:
float __binary32_abs(float x);
double __binary64_abs(double x);
When the input is a signaling
NaN
, two different outcomes are allowed by the standard. The operation could either signal invalid exception with quieted signaling
NaN
as output, or deliver signaling
NaN
as output without signaling any exception.

copysign

Description:
The function copies input floating-point number
x
to output in the same floating-point format, wit