forked from OSchip/llvm-project
69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/* ===-- multc3.c - Implement __multc3 -------------------------------------===
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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 __multc3 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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COMPILER_RT_ABI long double _Complex
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__multc3(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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int recalc = 0;
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if (crt_isinf(a) || crt_isinf(b)) {
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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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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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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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__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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