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//===-- mulsc3.c - Implement __mulsc3 -------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements __mulsc3 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//
#include "int_lib.h"
#include <math.h>
#include <complex.h>
// Returns: the product of a + ib and c + id
float _Complex
__mulsc3(float __a, float __b, float __c, float __d)
{
float __ac = __a * __c;
float __bd = __b * __d;
float __ad = __a * __d;
float __bc = __b * __c;
float _Complex z;
__real__ z = __ac - __bd;
__imag__ z = __ad + __bc;
if (isnan(__real__ z) && isnan(__imag__ z))
{
int __recalc = 0;
if (isinf(__a) || isinf(__b))
{
__a = copysignf(isinf(__a) ? 1 : 0, __a);
__b = copysignf(isinf(__b) ? 1 : 0, __b);
if (isnan(__c))
__c = copysignf(0, __c);
if (isnan(__d))
__d = copysignf(0, __d);
__recalc = 1;
}
if (isinf(__c) || isinf(__d))
{
__c = copysignf(isinf(__c) ? 1 : 0, __c);
__d = copysignf(isinf(__d) ? 1 : 0, __d);
if (isnan(__a))
__a = copysignf(0, __a);
if (isnan(__b))
__b = copysignf(0, __b);
__recalc = 1;
}
if (!__recalc && (isinf(__ac) || isinf(__bd) ||
isinf(__ad) || isinf(__bc)))
{
if (isnan(__a))
__a = copysignf(0, __a);
if (isnan(__b))
__b = copysignf(0, __b);
if (isnan(__c))
__c = copysignf(0, __c);
if (isnan(__d))
__d = copysignf(0, __d);
__recalc = 1;
}
if (__recalc)
{
__real__ z = INFINITY * (__a * __c - __b * __d);
__imag__ z = INFINITY * (__a * __d + __b * __c);
}
}
return z;
}
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