74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
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/* ===-- muldc3.c - Implement __muldc3 -------------------------------------===
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*
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* The LLVM Compiler Infrastructure
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*
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* This file is dual licensed under the MIT and the University of Illinois Open
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* Source Licenses. See LICENSE.TXT for details.
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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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*/
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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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double _Complex
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__muldc3(double __a, double __b, double __c, double __d)
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{
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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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double _Complex z;
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__real__ z = __ac - __bd;
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__imag__ z = __ad + __bc;
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if (crt_isnan(__real__ z) && crt_isnan(__imag__ z))
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{
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int __recalc = 0;
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if (crt_isinf(__a) || crt_isinf(__b))
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{
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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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{
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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) ||
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crt_isinf(__ad) || crt_isinf(__bc)))
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{
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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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{
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__real__ z = CRT_INFINITY * (__a * __c - __b * __d);
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__imag__ 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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