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//===-- 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;
}
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