fabsf.c

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/*
 * PROJECT:     ReactOS CRT library
 * LICENSE:     MIT (https://spdx.org/licenses/MIT)
 * PURPOSE:     Portable implementation of fabsf
 * COPYRIGHT:   Copyright 2021 Timo Kreuzer <timo.kreuzer@reactos.org>
 */
 
#include <math.h>
 
_Check_return_
float
__cdecl
fabsf(
    _In_ float x)
{
    /* Load the value as uint */
    unsigned int u32 = *(unsigned int*)&x;
 
    /* Clear the sign bit */
    u32 &= ~(1 << 31);
 
    /* Check for NAN */
    if (u32 > 0x7F800000)
    {
        /* Set error bit */
        *(unsigned int*)&x |= 0x00400000;
        return x;
    }
 
    /* Convert back to float */
    return *(float*)&u32;
}