forked from OSchip/llvm-project
61 lines
2.1 KiB
C
61 lines
2.1 KiB
C
/*===-- divsc3.c - Implement __divsc3 -------------------------------------===
|
|
*
|
|
* The LLVM Compiler Infrastructure
|
|
*
|
|
* This file is dual licensed under the MIT and the University of Illinois Open
|
|
* Source Licenses. See LICENSE.TXT for details.
|
|
*
|
|
* ===----------------------------------------------------------------------===
|
|
*
|
|
* This file implements __divsc3 for the compiler_rt library.
|
|
*
|
|
*===----------------------------------------------------------------------===
|
|
*/
|
|
|
|
#include "int_lib.h"
|
|
#include "int_math.h"
|
|
|
|
/* Returns: the quotient of (a + ib) / (c + id) */
|
|
|
|
float _Complex
|
|
__divsc3(float __a, float __b, float __c, float __d)
|
|
{
|
|
int __ilogbw = 0;
|
|
float __logbw = crt_logbf(crt_fmaxf(crt_fabsf(__c), crt_fabsf(__d)));
|
|
if (crt_isfinite(__logbw))
|
|
{
|
|
__ilogbw = (int)__logbw;
|
|
__c = crt_scalbnf(__c, -__ilogbw);
|
|
__d = crt_scalbnf(__d, -__ilogbw);
|
|
}
|
|
float __denom = __c * __c + __d * __d;
|
|
float _Complex z;
|
|
__real__ z = crt_scalbnf((__a * __c + __b * __d) / __denom, -__ilogbw);
|
|
__imag__ z = crt_scalbnf((__b * __c - __a * __d) / __denom, -__ilogbw);
|
|
if (crt_isnan(__real__ z) && crt_isnan(__imag__ z))
|
|
{
|
|
if ((__denom == 0) && (!crt_isnan(__a) || !crt_isnan(__b)))
|
|
{
|
|
__real__ z = crt_copysignf(CRT_INFINITY, __c) * __a;
|
|
__imag__ z = crt_copysignf(CRT_INFINITY, __c) * __b;
|
|
}
|
|
else if ((crt_isinf(__a) || crt_isinf(__b)) &&
|
|
crt_isfinite(__c) && crt_isfinite(__d))
|
|
{
|
|
__a = crt_copysignf(crt_isinf(__a) ? 1 : 0, __a);
|
|
__b = crt_copysignf(crt_isinf(__b) ? 1 : 0, __b);
|
|
__real__ z = CRT_INFINITY * (__a * __c + __b * __d);
|
|
__imag__ z = CRT_INFINITY * (__b * __c - __a * __d);
|
|
}
|
|
else if (crt_isinf(__logbw) && __logbw > 0 &&
|
|
crt_isfinite(__a) && crt_isfinite(__b))
|
|
{
|
|
__c = crt_copysignf(crt_isinf(__c) ? 1 : 0, __c);
|
|
__d = crt_copysignf(crt_isinf(__d) ? 1 : 0, __d);
|
|
__real__ z = 0 * (__a * __c + __b * __d);
|
|
__imag__ z = 0 * (__b * __c - __a * __d);
|
|
}
|
|
}
|
|
return z;
|
|
}
|