source: mainline/softfloat/generic/softfloat.c@ cf4a823

/*
 * Copyright (C) 2005 Josef Cejka
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include<softfloat.h>
#include<sftypes.h>
#include<arithmetic.h>
#include<conversion.h>
#include<comparison.h>
#include<other.h>

/* Arithmetic functions */

float __addsf3(float a, float b)
{
        float32 fa, fb;
        fa.f=a;
        fb.f=b;
        if (fa.parts.sign!=fb.parts.sign) {
                if (fa.parts.sign) {
                        fa.parts.sign=0;
                        return subFloat32(fb,fa).f;
                };
                fb.parts.sign=0;
                return subFloat32(fa,fb).f;
        }
        return addFloat32(fa,fb).f;
};

float __subsf3(float a, float b)
{
        float32 fa, fb;
        fa.f=a;
        fb.f=b;
        if (fa.parts.sign!=fb.parts.sign) {
                fb.parts.sign=!fb.parts.sign;
                return addFloat32(fa,fb).f;
        }
        return subFloat32(fa,fb).f;
};

float __negsf2(float a)
{
        float32 fa;
        fa.f=a;
        fa.parts.sign=!fa.parts.sign;
        return fa.f;
};

double __negdf2(double a)
{
        float64 fa;
        fa.d=a;
        fa.parts.sign=!fa.parts.sign;
        return fa.d;
};

/* Conversion functions */

/* Comparison functions */

/* a<b .. -1
 * a=b ..  0
 * a>b ..  1
 * */

int __cmpsf2(float a, float b) 
{
        float32 fa,fb;
        fa.f=a;
        fb.f=b;
        if ((isFloat32NaN(fa))||(isFloat32NaN(fb))) {
                return 1; /* no special constant for unordered - maybe signaled? */
        };

        
        if (isFloat32eq(fa,fb)) {
                return 0;
        };
        
        if (isFloat32lt(fa,fb)) {
                return -1;
                };
        return 1;
}

int __unordsf2(float a, float b) 
{
        float32 fa,fb;
        fa.f=a;
        fb.f=b;
        return ((isFloat32NaN(fa))||(isFloat32NaN(fb)));
};

/** 
 * @return zero, if neither argument is a NaN and are equal
 * */
int __eqsf2(float a, float b) 
{
        float32 fa,fb;
        fa.f=a;
        fb.f=b;
        if ((isFloat32NaN(fa))||(isFloat32NaN(fb))) {
                /* TODO: sigNaNs*/
                return 1;
                };
        return isFloat32eq(fa,fb)-1;
};

/* strange behavior, but it was in gcc documentation */
int __nesf2(float a, float b) 
{
        return __eqsf2(a,b);
};

/* return value >= 0 if a>=b and neither is NaN */
int __gesf2(float a, float b)
{
        float32 fa,fb;
        fa.f=a;
        fb.f=b;
        if ((isFloat32NaN(fa))||(isFloat32NaN(fb))) {
                /* TODO: sigNaNs*/
                return -1;
                };
        
        if (isFloat32eq(fa,fb)) {
                return 0;
        };
        
        if (isFloat32gt(fa,fb)) {
                return 1;
                };
        
        return -1;
}

/** Return negative value, if a<b and neither is NaN*/
int __ltsf2(float a, float b)
{
        float32 fa,fb;
        fa.f=a;
        fb.f=b;
        if ((isFloat32NaN(fa))||(isFloat32NaN(fb))) {
                /* TODO: sigNaNs*/
                return 1;
                };
        if (isFloat32lt(fa, fb)) {
                return -1;
                };
        return 0;
}

/* return value <= 0 if a<=b and neither is NaN */
int __lesf2(float a, float b)
{
        float32 fa,fb;
        fa.f=a;
        fb.f=b;
        if ((isFloat32NaN(fa))||(isFloat32NaN(fb))) {
                /* TODO: sigNaNs*/
                return 1;
                };
        
        if (isFloat32eq(fa,fb)) {
                return 0;
        };
        
        if (isFloat32lt(fa,fb)) {
                return -1;
                };
        
        return 1;
}

/** Return positive value, if a>b and neither is NaN*/
int __gtsf2(float a, float b)
{
        float32 fa,fb;
        fa.f=a;
        fb.f=b;
        if ((isFloat32NaN(fa))||(isFloat32NaN(fb))) {
                /* TODO: sigNaNs*/
                return -1;
                };
        if (isFloat32gt(fa, fb)) {
                return 1;
                };
        return 0;
}

/* Other functions */