forked from OSchip/llvm-project
74 lines
2.2 KiB
C
74 lines
2.2 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 distributed under the University of Illinois Open Source
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// License. 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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#include "int_lib.h"
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#include <math.h>
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#include <complex.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 (isnan(__real__ z) && isnan(__imag__ z))
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{
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int __recalc = 0;
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if (isinf(__a) || isinf(__b))
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{
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__a = copysign(isinf(__a) ? 1 : 0, __a);
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__b = copysign(isinf(__b) ? 1 : 0, __b);
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if (isnan(__c))
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__c = copysign(0, __c);
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if (isnan(__d))
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__d = copysign(0, __d);
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__recalc = 1;
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}
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if (isinf(__c) || isinf(__d))
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{
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__c = copysign(isinf(__c) ? 1 : 0, __c);
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__d = copysign(isinf(__d) ? 1 : 0, __d);
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if (isnan(__a))
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__a = copysign(0, __a);
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if (isnan(__b))
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__b = copysign(0, __b);
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__recalc = 1;
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}
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if (!__recalc && (isinf(__ac) || isinf(__bd) ||
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isinf(__ad) || isinf(__bc)))
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{
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if (isnan(__a))
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__a = copysign(0, __a);
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if (isnan(__b))
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__b = copysign(0, __b);
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if (isnan(__c))
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__c = copysign(0, __c);
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if (isnan(__d))
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__d = 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 = INFINITY * (__a * __c - __b * __d);
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__imag__ z = 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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