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/* ===-- divdc3.c - Implement __divdc3 -------------------------------------===
*
* The LLVM Compiler Infrastructure
*
* This file is distributed under the University of Illinois Open Source
* License. See LICENSE.TXT for details.
*
* ===----------------------------------------------------------------------===
*
* This file implements __divdc3 for the compiler_rt library.
*
* ===----------------------------------------------------------------------===
*/
#include "int_lib.h"
#include <math.h>
#include <complex.h>
/* Returns: the quotient of (a + ib) / (c + id) */
double _Complex
__divdc3(double __a, double __b, double __c, double __d)
{
int __ilogbw = 0;
double __logbw = logb(fmax(fabs(__c), fabs(__d)));
if (isfinite(__logbw))
{
__ilogbw = (int)__logbw;
__c = scalbn(__c, -__ilogbw);
__d = scalbn(__d, -__ilogbw);
}
double __denom = __c * __c + __d * __d;
double _Complex z;
__real__ z = scalbn((__a * __c + __b * __d) / __denom, -__ilogbw);
__imag__ z = scalbn((__b * __c - __a * __d) / __denom, -__ilogbw);
if (isnan(__real__ z) && isnan(__imag__ z))
{
if ((__denom == 0.0) && (!isnan(__a) || !isnan(__b)))
{
__real__ z = copysign(INFINITY, __c) * __a;
__imag__ z = copysign(INFINITY, __c) * __b;
}
else if ((isinf(__a) || isinf(__b)) && isfinite(__c) && isfinite(__d))
{
__a = copysign(isinf(__a) ? 1.0 : 0.0, __a);
__b = copysign(isinf(__b) ? 1.0 : 0.0, __b);
__real__ z = INFINITY * (__a * __c + __b * __d);
__imag__ z = INFINITY * (__b * __c - __a * __d);
}
else if (isinf(__logbw) && __logbw > 0.0 && isfinite(__a) && isfinite(__b))
{
__c = copysign(isinf(__c) ? 1.0 : 0.0, __c);
__d = copysign(isinf(__d) ? 1.0 : 0.0, __d);
__real__ z = 0.0 * (__a * __c + __b * __d);
__imag__ z = 0.0 * (__b * __c - __a * __d);
}
}
return z;
}
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