| //===-- muldc3.c - Implement __muldc3 -------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements __muldc3 for the compiler_rt library. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "int_lib.h" |
| #include "int_math.h" |
| |
| // Returns: the product of a + ib and c + id |
| |
| COMPILER_RT_ABI Dcomplex __muldc3(double __a, double __b, double __c, |
| double __d) { |
| double __ac = __a * __c; |
| double __bd = __b * __d; |
| double __ad = __a * __d; |
| double __bc = __b * __c; |
| Dcomplex z; |
| COMPLEX_REAL(z) = __ac - __bd; |
| COMPLEX_IMAGINARY(z) = __ad + __bc; |
| if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) { |
| int __recalc = 0; |
| if (crt_isinf(__a) || crt_isinf(__b)) { |
| __a = crt_copysign(crt_isinf(__a) ? 1 : 0, __a); |
| __b = crt_copysign(crt_isinf(__b) ? 1 : 0, __b); |
| if (crt_isnan(__c)) |
| __c = crt_copysign(0, __c); |
| if (crt_isnan(__d)) |
| __d = crt_copysign(0, __d); |
| __recalc = 1; |
| } |
| if (crt_isinf(__c) || crt_isinf(__d)) { |
| __c = crt_copysign(crt_isinf(__c) ? 1 : 0, __c); |
| __d = crt_copysign(crt_isinf(__d) ? 1 : 0, __d); |
| if (crt_isnan(__a)) |
| __a = crt_copysign(0, __a); |
| if (crt_isnan(__b)) |
| __b = crt_copysign(0, __b); |
| __recalc = 1; |
| } |
| if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) || crt_isinf(__ad) || |
| crt_isinf(__bc))) { |
| if (crt_isnan(__a)) |
| __a = crt_copysign(0, __a); |
| if (crt_isnan(__b)) |
| __b = crt_copysign(0, __b); |
| if (crt_isnan(__c)) |
| __c = crt_copysign(0, __c); |
| if (crt_isnan(__d)) |
| __d = crt_copysign(0, __d); |
| __recalc = 1; |
| } |
| if (__recalc) { |
| COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c - __b * __d); |
| COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__a * __d + __b * __c); |
| } |
| } |
| return z; |
| } |