# 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);`

### Note

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);`

### Note

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);`

### Note

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, with the same sign as `y`.

Calling interface:
`float __binary32_copysign(float x, float y);`
`double __binary64_copysign(double x, double y);`

### Note

When the first 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.

Parent topic: IEEE 754-2008 Binary Floating-Point Conformance Library