67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
/* clang-format off */
|
|
/* ===-- divxc3.c - Implement __divxc3 -------------------------------------===
|
|
*
|
|
* 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 __divxc3 for the compiler_rt library.
|
|
*
|
|
*/
|
|
|
|
STATIC_YOINK("huge_compiler_rt_license");
|
|
|
|
#if !_ARCH_PPC
|
|
|
|
#include "third_party/compiler_rt/int_lib.h"
|
|
#include "third_party/compiler_rt/int_math.h"
|
|
|
|
/* Returns: the quotient of (a + ib) / (c + id) */
|
|
|
|
COMPILER_RT_ABI Lcomplex
|
|
__divxc3(long double __a, long double __b, long double __c, long double __d)
|
|
{
|
|
int __ilogbw = 0;
|
|
long double __logbw = crt_logbl(crt_fmaxl(crt_fabsl(__c), crt_fabsl(__d)));
|
|
if (crt_isfinite(__logbw))
|
|
{
|
|
__ilogbw = (int)__logbw;
|
|
__c = crt_scalbnl(__c, -__ilogbw);
|
|
__d = crt_scalbnl(__d, -__ilogbw);
|
|
}
|
|
long double __denom = __c * __c + __d * __d;
|
|
Lcomplex z;
|
|
COMPLEX_REAL(z) = crt_scalbnl((__a * __c + __b * __d) / __denom, -__ilogbw);
|
|
COMPLEX_IMAGINARY(z) = crt_scalbnl((__b * __c - __a * __d) / __denom, -__ilogbw);
|
|
if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z)))
|
|
{
|
|
if ((__denom == 0) && (!crt_isnan(__a) || !crt_isnan(__b)))
|
|
{
|
|
COMPLEX_REAL(z) = crt_copysignl(CRT_INFINITY, __c) * __a;
|
|
COMPLEX_IMAGINARY(z) = crt_copysignl(CRT_INFINITY, __c) * __b;
|
|
}
|
|
else if ((crt_isinf(__a) || crt_isinf(__b)) &&
|
|
crt_isfinite(__c) && crt_isfinite(__d))
|
|
{
|
|
__a = crt_copysignl(crt_isinf(__a) ? 1 : 0, __a);
|
|
__b = crt_copysignl(crt_isinf(__b) ? 1 : 0, __b);
|
|
COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c + __b * __d);
|
|
COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__b * __c - __a * __d);
|
|
}
|
|
else if (crt_isinf(__logbw) && __logbw > 0 &&
|
|
crt_isfinite(__a) && crt_isfinite(__b))
|
|
{
|
|
__c = crt_copysignl(crt_isinf(__c) ? 1 : 0, __c);
|
|
__d = crt_copysignl(crt_isinf(__d) ? 1 : 0, __d);
|
|
COMPLEX_REAL(z) = 0 * (__a * __c + __b * __d);
|
|
COMPLEX_IMAGINARY(z) = 0 * (__b * __c - __a * __d);
|
|
}
|
|
}
|
|
return z;
|
|
}
|
|
|
|
#endif
|