75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
/* ===-- muldc3.c - Implement __muldc3 -------------------------------------===
|
|
*
|
|
* The LLVM Compiler Infrastructure
|
|
*
|
|
* This file is distributed under the University of Illinois Open Source
|
|
* License. See LICENSE.TXT for details.
|
|
*
|
|
* ===----------------------------------------------------------------------===
|
|
*
|
|
* This file implements __muldc3 for the compiler_rt library.
|
|
*
|
|
* ===----------------------------------------------------------------------===
|
|
*/
|
|
|
|
#include "int_lib.h"
|
|
#include <math.h>
|
|
#include <complex.h>
|
|
|
|
/* Returns: the product of a + ib and c + id */
|
|
|
|
double _Complex
|
|
__muldc3(double __a, double __b, double __c, double __d)
|
|
{
|
|
double __ac = __a * __c;
|
|
double __bd = __b * __d;
|
|
double __ad = __a * __d;
|
|
double __bc = __b * __c;
|
|
double _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 = copysign(isinf(__a) ? 1 : 0, __a);
|
|
__b = copysign(isinf(__b) ? 1 : 0, __b);
|
|
if (isnan(__c))
|
|
__c = copysign(0, __c);
|
|
if (isnan(__d))
|
|
__d = copysign(0, __d);
|
|
__recalc = 1;
|
|
}
|
|
if (isinf(__c) || isinf(__d))
|
|
{
|
|
__c = copysign(isinf(__c) ? 1 : 0, __c);
|
|
__d = copysign(isinf(__d) ? 1 : 0, __d);
|
|
if (isnan(__a))
|
|
__a = copysign(0, __a);
|
|
if (isnan(__b))
|
|
__b = copysign(0, __b);
|
|
__recalc = 1;
|
|
}
|
|
if (!__recalc && (isinf(__ac) || isinf(__bd) ||
|
|
isinf(__ad) || isinf(__bc)))
|
|
{
|
|
if (isnan(__a))
|
|
__a = copysign(0, __a);
|
|
if (isnan(__b))
|
|
__b = copysign(0, __b);
|
|
if (isnan(__c))
|
|
__c = copysign(0, __c);
|
|
if (isnan(__d))
|
|
__d = copysign(0, __d);
|
|
__recalc = 1;
|
|
}
|
|
if (__recalc)
|
|
{
|
|
__real__ z = INFINITY * (__a * __c - __b * __d);
|
|
__imag__ z = INFINITY * (__a * __d + __b * __c);
|
|
}
|
|
}
|
|
return z;
|
|
}
|