66 lines · c
1//===-- muldc3.c - Implement __muldc3 -------------------------------------===//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-exception6//7//===----------------------------------------------------------------------===//8//9// This file implements __muldc3 for the compiler_rt library.10//11//===----------------------------------------------------------------------===//12 13#include "int_lib.h"14#include "int_math.h"15 16// Returns: the product of a + ib and c + id17 18COMPILER_RT_ABI Dcomplex __muldc3(double __a, double __b, double __c,19 double __d) {20 double __ac = __a * __c;21 double __bd = __b * __d;22 double __ad = __a * __d;23 double __bc = __b * __c;24 Dcomplex z;25 COMPLEX_REAL(z) = __ac - __bd;26 COMPLEX_IMAGINARY(z) = __ad + __bc;27 if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) {28 int __recalc = 0;29 if (crt_isinf(__a) || crt_isinf(__b)) {30 __a = crt_copysign(crt_isinf(__a) ? 1 : 0, __a);31 __b = crt_copysign(crt_isinf(__b) ? 1 : 0, __b);32 if (crt_isnan(__c))33 __c = crt_copysign(0, __c);34 if (crt_isnan(__d))35 __d = crt_copysign(0, __d);36 __recalc = 1;37 }38 if (crt_isinf(__c) || crt_isinf(__d)) {39 __c = crt_copysign(crt_isinf(__c) ? 1 : 0, __c);40 __d = crt_copysign(crt_isinf(__d) ? 1 : 0, __d);41 if (crt_isnan(__a))42 __a = crt_copysign(0, __a);43 if (crt_isnan(__b))44 __b = crt_copysign(0, __b);45 __recalc = 1;46 }47 if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) || crt_isinf(__ad) ||48 crt_isinf(__bc))) {49 if (crt_isnan(__a))50 __a = crt_copysign(0, __a);51 if (crt_isnan(__b))52 __b = crt_copysign(0, __b);53 if (crt_isnan(__c))54 __c = crt_copysign(0, __c);55 if (crt_isnan(__d))56 __d = crt_copysign(0, __d);57 __recalc = 1;58 }59 if (__recalc) {60 COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c - __b * __d);61 COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__a * __d + __b * __c);62 }63 }64 return z;65}66