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/* ===-- mulxc3.c - Implement __mulxc3 -------------------------------------=== |
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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 __mulxc3 for the compiler_rt library. |
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* |
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* ===----------------------------------------------------------------------=== |
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*/ |
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#if !_ARCH_PPC |
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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 Lcomplex |
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__mulxc3(long double __a, long double __b, long double __c, long double __d) |
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{ |
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long double __ac = __a * __c; |
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long double __bd = __b * __d; |
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long double __ad = __a * __d; |
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long double __bc = __b * __c; |
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Lcomplex 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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{ |
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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_copysignl(crt_isinf(__a) ? 1 : 0, __a); |
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__b = crt_copysignl(crt_isinf(__b) ? 1 : 0, __b); |
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if (crt_isnan(__c)) |
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__c = crt_copysignl(0, __c); |
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if (crt_isnan(__d)) |
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__d = crt_copysignl(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_copysignl(crt_isinf(__c) ? 1 : 0, __c); |
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__d = crt_copysignl(crt_isinf(__d) ? 1 : 0, __d); |
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if (crt_isnan(__a)) |
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__a = crt_copysignl(0, __a); |
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if (crt_isnan(__b)) |
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__b = crt_copysignl(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_copysignl(0, __a); |
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if (crt_isnan(__b)) |
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__b = crt_copysignl(0, __b); |
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if (crt_isnan(__c)) |
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__c = crt_copysignl(0, __c); |
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if (crt_isnan(__d)) |
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__d = crt_copysignl(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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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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#endif |