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//===-- multc3.c - Implement __multc3 -------------------------------------===//
//
// 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 __multc3 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 long double _Complex __multc3(long double a, long double b,
long double c, long double d) {
long double ac = a * c;
long double bd = b * d;
long double ad = a * d;
long double bc = b * c;
long double _Complex z;
__real__ z = ac - bd;
__imag__ z = ad + bc;
if (crt_isnan(__real__ z) && crt_isnan(__imag__ z)) {
int recalc = 0;
if (crt_isinf(a) || crt_isinf(b)) {
a = crt_copysignl(crt_isinf(a) ? 1 : 0, a);
b = crt_copysignl(crt_isinf(b) ? 1 : 0, b);
if (crt_isnan(c))
c = crt_copysignl(0, c);
if (crt_isnan(d))
d = crt_copysignl(0, d);
recalc = 1;
}
if (crt_isinf(c) || crt_isinf(d)) {
c = crt_copysignl(crt_isinf(c) ? 1 : 0, c);
d = crt_copysignl(crt_isinf(d) ? 1 : 0, d);
if (crt_isnan(a))
a = crt_copysignl(0, a);
if (crt_isnan(b))
b = crt_copysignl(0, b);
recalc = 1;
}
if (!recalc &&
(crt_isinf(ac) || crt_isinf(bd) || crt_isinf(ad) || crt_isinf(bc))) {
if (crt_isnan(a))
a = crt_copysignl(0, a);
if (crt_isnan(b))
b = crt_copysignl(0, b);
if (crt_isnan(c))
c = crt_copysignl(0, c);
if (crt_isnan(d))
d = crt_copysignl(0, d);
recalc = 1;
}
if (recalc) {
__real__ z = CRT_INFINITY * (a * c - b * d);
__imag__ z = CRT_INFINITY * (a * d + b * c);
}
}
return z;
}
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