95 lines
2.2 KiB
C
95 lines
2.2 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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*/
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#include "DD.h"
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#include "../int_math.h"
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#define makeFinite(x) { \
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(x).s.hi = crt_copysign(crt_isinf((x).s.hi) ? 1.0 : 0.0, (x).s.hi); \
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(x).s.lo = 0.0; \
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}
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#define zeroNaN(x) { \
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if (crt_isnan((x).s.hi)) { \
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(x).s.hi = crt_copysign(0.0, (x).s.hi); \
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(x).s.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 (crt_isnan(real.s.hi) && crt_isnan(imag.s.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 (crt_isinf(aDD.s.hi) || crt_isinf(bDD.s.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 (crt_isinf(cDD.s.hi) || crt_isinf(dDD.s.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 (crt_isinf(acDD.s.hi) || crt_isinf(bdDD.s.hi) ||
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crt_isinf(adDD.s.hi) || crt_isinf(bcDD.s.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.s.hi = CRT_INFINITY * (aDD.s.hi*cDD.s.hi - bDD.s.hi*dDD.s.hi);
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real.s.lo = 0.0;
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imag.s.hi = CRT_INFINITY * (aDD.s.hi*dDD.s.hi + bDD.s.hi*cDD.s.hi);
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imag.s.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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