1*3cab2bb3Spatrick //===-- mulsc3.c - Implement __mulsc3 -------------------------------------===//
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 __mulsc3 for the compiler_rt library.
10*3cab2bb3Spatrick //
11*3cab2bb3Spatrick //===----------------------------------------------------------------------===//
12*3cab2bb3Spatrick
13*3cab2bb3Spatrick #include "int_lib.h"
14*3cab2bb3Spatrick #include "int_math.h"
15*3cab2bb3Spatrick
16*3cab2bb3Spatrick // Returns: the product of a + ib and c + id
17*3cab2bb3Spatrick
__mulsc3(float __a,float __b,float __c,float __d)18*3cab2bb3Spatrick COMPILER_RT_ABI Fcomplex __mulsc3(float __a, float __b, float __c, float __d) {
19*3cab2bb3Spatrick float __ac = __a * __c;
20*3cab2bb3Spatrick float __bd = __b * __d;
21*3cab2bb3Spatrick float __ad = __a * __d;
22*3cab2bb3Spatrick float __bc = __b * __c;
23*3cab2bb3Spatrick Fcomplex z;
24*3cab2bb3Spatrick COMPLEX_REAL(z) = __ac - __bd;
25*3cab2bb3Spatrick COMPLEX_IMAGINARY(z) = __ad + __bc;
26*3cab2bb3Spatrick if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) {
27*3cab2bb3Spatrick int __recalc = 0;
28*3cab2bb3Spatrick if (crt_isinf(__a) || crt_isinf(__b)) {
29*3cab2bb3Spatrick __a = crt_copysignf(crt_isinf(__a) ? 1 : 0, __a);
30*3cab2bb3Spatrick __b = crt_copysignf(crt_isinf(__b) ? 1 : 0, __b);
31*3cab2bb3Spatrick if (crt_isnan(__c))
32*3cab2bb3Spatrick __c = crt_copysignf(0, __c);
33*3cab2bb3Spatrick if (crt_isnan(__d))
34*3cab2bb3Spatrick __d = crt_copysignf(0, __d);
35*3cab2bb3Spatrick __recalc = 1;
36*3cab2bb3Spatrick }
37*3cab2bb3Spatrick if (crt_isinf(__c) || crt_isinf(__d)) {
38*3cab2bb3Spatrick __c = crt_copysignf(crt_isinf(__c) ? 1 : 0, __c);
39*3cab2bb3Spatrick __d = crt_copysignf(crt_isinf(__d) ? 1 : 0, __d);
40*3cab2bb3Spatrick if (crt_isnan(__a))
41*3cab2bb3Spatrick __a = crt_copysignf(0, __a);
42*3cab2bb3Spatrick if (crt_isnan(__b))
43*3cab2bb3Spatrick __b = crt_copysignf(0, __b);
44*3cab2bb3Spatrick __recalc = 1;
45*3cab2bb3Spatrick }
46*3cab2bb3Spatrick if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) || crt_isinf(__ad) ||
47*3cab2bb3Spatrick crt_isinf(__bc))) {
48*3cab2bb3Spatrick if (crt_isnan(__a))
49*3cab2bb3Spatrick __a = crt_copysignf(0, __a);
50*3cab2bb3Spatrick if (crt_isnan(__b))
51*3cab2bb3Spatrick __b = crt_copysignf(0, __b);
52*3cab2bb3Spatrick if (crt_isnan(__c))
53*3cab2bb3Spatrick __c = crt_copysignf(0, __c);
54*3cab2bb3Spatrick if (crt_isnan(__d))
55*3cab2bb3Spatrick __d = crt_copysignf(0, __d);
56*3cab2bb3Spatrick __recalc = 1;
57*3cab2bb3Spatrick }
58*3cab2bb3Spatrick if (__recalc) {
59*3cab2bb3Spatrick COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c - __b * __d);
60*3cab2bb3Spatrick COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__a * __d + __b * __c);
61*3cab2bb3Spatrick }
62*3cab2bb3Spatrick }
63*3cab2bb3Spatrick return z;
64*3cab2bb3Spatrick }
65