0ece074de9
This version of libcompiler_rt adds support for __mulo[sdt]i4(), which computes a multiply and its overflow flag. There are also a lot of cleanup fixes to headers that don't really affect us. Updating to this revision should make it a bit easier to contribute changes back to the LLVM developers.
78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/* ===-- 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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long double _Complex
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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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long 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_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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__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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#endif
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