1*3cab2bb3Spatrick //===-- divxc3.c - Implement __divxc3 -------------------------------------===//
2*3cab2bb3Spatrick //
3*3cab2bb3Spatrick // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4*3cab2bb3Spatrick // See https://llvm.org/LICENSE.txt for license information.
5*3cab2bb3Spatrick // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6*3cab2bb3Spatrick //
7*3cab2bb3Spatrick //===----------------------------------------------------------------------===//
8*3cab2bb3Spatrick //
9*3cab2bb3Spatrick // This file implements __divxc3 for the compiler_rt library.
10*3cab2bb3Spatrick //
11*3cab2bb3Spatrick //===----------------------------------------------------------------------===//
12*3cab2bb3Spatrick
13*3cab2bb3Spatrick #if !_ARCH_PPC
14*3cab2bb3Spatrick
15*3cab2bb3Spatrick #include "int_lib.h"
16*3cab2bb3Spatrick #include "int_math.h"
17*3cab2bb3Spatrick
18*3cab2bb3Spatrick // Returns: the quotient of (a + ib) / (c + id)
19*3cab2bb3Spatrick
__divxc3(long double __a,long double __b,long double __c,long double __d)20*3cab2bb3Spatrick COMPILER_RT_ABI Lcomplex __divxc3(long double __a, long double __b,
21*3cab2bb3Spatrick long double __c, long double __d) {
22*3cab2bb3Spatrick int __ilogbw = 0;
23*3cab2bb3Spatrick long double __logbw = crt_logbl(crt_fmaxl(crt_fabsl(__c), crt_fabsl(__d)));
24*3cab2bb3Spatrick if (crt_isfinite(__logbw)) {
25*3cab2bb3Spatrick __ilogbw = (int)__logbw;
26*3cab2bb3Spatrick __c = crt_scalbnl(__c, -__ilogbw);
27*3cab2bb3Spatrick __d = crt_scalbnl(__d, -__ilogbw);
28*3cab2bb3Spatrick }
29*3cab2bb3Spatrick long double __denom = __c * __c + __d * __d;
30*3cab2bb3Spatrick Lcomplex z;
31*3cab2bb3Spatrick COMPLEX_REAL(z) = crt_scalbnl((__a * __c + __b * __d) / __denom, -__ilogbw);
32*3cab2bb3Spatrick COMPLEX_IMAGINARY(z) =
33*3cab2bb3Spatrick crt_scalbnl((__b * __c - __a * __d) / __denom, -__ilogbw);
34*3cab2bb3Spatrick if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) {
35*3cab2bb3Spatrick if ((__denom == 0) && (!crt_isnan(__a) || !crt_isnan(__b))) {
36*3cab2bb3Spatrick COMPLEX_REAL(z) = crt_copysignl(CRT_INFINITY, __c) * __a;
37*3cab2bb3Spatrick COMPLEX_IMAGINARY(z) = crt_copysignl(CRT_INFINITY, __c) * __b;
38*3cab2bb3Spatrick } else if ((crt_isinf(__a) || crt_isinf(__b)) && crt_isfinite(__c) &&
39*3cab2bb3Spatrick crt_isfinite(__d)) {
40*3cab2bb3Spatrick __a = crt_copysignl(crt_isinf(__a) ? 1 : 0, __a);
41*3cab2bb3Spatrick __b = crt_copysignl(crt_isinf(__b) ? 1 : 0, __b);
42*3cab2bb3Spatrick COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c + __b * __d);
43*3cab2bb3Spatrick COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__b * __c - __a * __d);
44*3cab2bb3Spatrick } else if (crt_isinf(__logbw) && __logbw > 0 && crt_isfinite(__a) &&
45*3cab2bb3Spatrick crt_isfinite(__b)) {
46*3cab2bb3Spatrick __c = crt_copysignl(crt_isinf(__c) ? 1 : 0, __c);
47*3cab2bb3Spatrick __d = crt_copysignl(crt_isinf(__d) ? 1 : 0, __d);
48*3cab2bb3Spatrick COMPLEX_REAL(z) = 0 * (__a * __c + __b * __d);
49*3cab2bb3Spatrick COMPLEX_IMAGINARY(z) = 0 * (__b * __c - __a * __d);
50*3cab2bb3Spatrick }
51*3cab2bb3Spatrick }
52*3cab2bb3Spatrick return z;
53*3cab2bb3Spatrick }
54*3cab2bb3Spatrick
55*3cab2bb3Spatrick #endif
56