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