1 /*===-- divtc3.c - Implement __divtc3 -------------------------------------===
2 *
3 * The LLVM Compiler Infrastructure
4 *
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
7 *
8 * ===----------------------------------------------------------------------===
9 *
10 * This file implements __divtc3 for the compiler_rt library.
11 *
12 *===----------------------------------------------------------------------===
13 */
14
15 #include "int_lib.h"
16 #include "int_math.h"
17
18 /* Returns: the quotient of (a + ib) / (c + id) */
19
20 COMPILER_RT_ABI long double _Complex
__divtc3(long double __a,long double __b,long double __c,long double __d)21 __divtc3(long double __a, long double __b, long double __c, long double __d)
22 {
23 int __ilogbw = 0;
24 long double __logbw = crt_logbl(crt_fmaxl(crt_fabsl(__c), crt_fabsl(__d)));
25 if (crt_isfinite(__logbw))
26 {
27 __ilogbw = (int)__logbw;
28 __c = crt_scalbnl(__c, -__ilogbw);
29 __d = crt_scalbnl(__d, -__ilogbw);
30 }
31 long double __denom = __c * __c + __d * __d;
32 long double _Complex z;
33 __real__ z = crt_scalbnl((__a * __c + __b * __d) / __denom, -__ilogbw);
34 __imag__ z = crt_scalbnl((__b * __c - __a * __d) / __denom, -__ilogbw);
35 if (crt_isnan(__real__ z) && crt_isnan(__imag__ z))
36 {
37 if ((__denom == 0.0) && (!crt_isnan(__a) || !crt_isnan(__b)))
38 {
39 __real__ z = crt_copysignl(CRT_INFINITY, __c) * __a;
40 __imag__ z = crt_copysignl(CRT_INFINITY, __c) * __b;
41 }
42 else if ((crt_isinf(__a) || crt_isinf(__b)) &&
43 crt_isfinite(__c) && crt_isfinite(__d))
44 {
45 __a = crt_copysignl(crt_isinf(__a) ? 1.0 : 0.0, __a);
46 __b = crt_copysignl(crt_isinf(__b) ? 1.0 : 0.0, __b);
47 __real__ z = CRT_INFINITY * (__a * __c + __b * __d);
48 __imag__ z = CRT_INFINITY * (__b * __c - __a * __d);
49 }
50 else if (crt_isinf(__logbw) && __logbw > 0.0 &&
51 crt_isfinite(__a) && crt_isfinite(__b))
52 {
53 __c = crt_copysignl(crt_isinf(__c) ? 1.0 : 0.0, __c);
54 __d = crt_copysignl(crt_isinf(__d) ? 1.0 : 0.0, __d);
55 __real__ z = 0.0 * (__a * __c + __b * __d);
56 __imag__ z = 0.0 * (__b * __c - __a * __d);
57 }
58 }
59 return z;
60 }
61