forked from OSchip/llvm-project
93 lines
1.9 KiB
C
93 lines
1.9 KiB
C
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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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#include "DD.h"
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#include <math.h>
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#define makeFinite(x) { \
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(x).hi = __builtin_copysign(isinf((x).hi) ? 1.0 : 0.0, (x).hi); \
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(x).lo = 0.0; \
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}
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#define zeroNaN(x) { \
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if (isnan((x).hi)) { \
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(x).hi = __builtin_copysign(0.0, (x).hi); \
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(x).lo = 0.0; \
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} \
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}
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long double __gcc_qadd(long double, long double);
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long double __gcc_qsub(long double, long double);
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long double __gcc_qmul(long double, long double);
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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 = __gcc_qmul(a,c);
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long double bd = __gcc_qmul(b,d);
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long double ad = __gcc_qmul(a,d);
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long double bc = __gcc_qmul(b,c);
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DD real = { .ld = __gcc_qsub(ac,bd) };
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DD imag = { .ld = __gcc_qadd(ad,bc) };
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if (isnan(real.hi) && isnan(imag.hi))
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{
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int recalc = 0;
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DD aDD = { .ld = a };
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DD bDD = { .ld = b };
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DD cDD = { .ld = c };
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DD dDD = { .ld = d };
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if (isinf(aDD.hi) || isinf(bDD.hi))
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{
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makeFinite(aDD);
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makeFinite(bDD);
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zeroNaN(cDD);
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zeroNaN(dDD);
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recalc = 1;
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}
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if (isinf(cDD.hi) || isinf(dDD.hi))
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{
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makeFinite(cDD);
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makeFinite(dDD);
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zeroNaN(aDD);
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zeroNaN(bDD);
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recalc = 1;
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}
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if (!recalc)
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{
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DD acDD = { .ld = ac };
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DD bdDD = { .ld = bd };
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DD adDD = { .ld = ad };
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DD bcDD = { .ld = bc };
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if (isinf(acDD.hi) || isinf(bdDD.hi) || isinf(adDD.hi) || isinf(bcDD.hi))
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{
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zeroNaN(aDD);
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zeroNaN(bDD);
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zeroNaN(cDD);
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zeroNaN(dDD);
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recalc = 1;
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}
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}
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if (recalc)
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{
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real.hi = INFINITY * (aDD.hi*cDD.hi - bDD.hi*dDD.hi);
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real.lo = 0.0;
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imag.hi = INFINITY * (aDD.hi*dDD.hi + bDD.hi*cDD.hi);
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imag.lo = 0.0;
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}
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}
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long double _Complex z;
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__real__ z = real.ld;
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__imag__ z = imag.ld;
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return z;
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}
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