1//===-- multc3.c - Implement __multc3 -------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements __multc3 for the compiler_rt library.
10//
11//===----------------------------------------------------------------------===//
12
13#define QUAD_PRECISION
14#include "fp_lib.h"
15#include "int_lib.h"
16#include "int_math.h"
17
18#if defined(CRT_HAS_128BIT) && defined(CRT_HAS_F128)
19
20// Returns: the product of a + ib and c + id
21
22COMPILER_RT_ABI Qcomplex __multc3(fp_t a, fp_t b, fp_t c, fp_t d) {
23 fp_t ac = a * c;
24 fp_t bd = b * d;
25 fp_t ad = a * d;
26 fp_t bc = b * c;
27 Qcomplex z;
28 COMPLEXTF_REAL(z) = ac - bd;
29 COMPLEXTF_IMAGINARY(z) = ad + bc;
30 if (crt_isnan(COMPLEXTF_REAL(z)) && crt_isnan(COMPLEXTF_IMAGINARY(z))) {
31 int recalc = 0;
32 if (crt_isinf(a) || crt_isinf(b)) {
33 a = crt_copysigntf(crt_isinf(a) ? 1 : 0, a);
34 b = crt_copysigntf(crt_isinf(b) ? 1 : 0, b);
35 if (crt_isnan(c))
36 c = crt_copysigntf(0, c);
37 if (crt_isnan(d))
38 d = crt_copysigntf(0, d);
39 recalc = 1;
40 }
41 if (crt_isinf(c) || crt_isinf(d)) {
42 c = crt_copysigntf(crt_isinf(c) ? 1 : 0, c);
43 d = crt_copysigntf(crt_isinf(d) ? 1 : 0, d);
44 if (crt_isnan(a))
45 a = crt_copysigntf(0, a);
46 if (crt_isnan(b))
47 b = crt_copysigntf(0, b);
48 recalc = 1;
49 }
50 if (!recalc &&
51 (crt_isinf(ac) || crt_isinf(bd) || crt_isinf(ad) || crt_isinf(bc))) {
52 if (crt_isnan(a))
53 a = crt_copysigntf(0, a);
54 if (crt_isnan(b))
55 b = crt_copysigntf(0, b);
56 if (crt_isnan(c))
57 c = crt_copysigntf(0, c);
58 if (crt_isnan(d))
59 d = crt_copysigntf(0, d);
60 recalc = 1;
61 }
62 if (recalc) {
63 COMPLEXTF_REAL(z) = CRT_INFINITY * (a * c - b * d);
64 COMPLEXTF_IMAGINARY(z) = CRT_INFINITY * (a * d + b * c);
65 }
66 }
67 return z;
68}
69
70#endif
71

source code of compiler-rt/lib/builtins/multc3.c