forked from OSchip/llvm-project
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
// 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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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 __gcc_qdiv(long double, long double);
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long double _Complex
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__divtc3(long double a, long double b, long double c, long double d)
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{
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DD cDD = { .ld = c };
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DD dDD = { .ld = d };
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int ilogbw = 0;
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const double logbw = logb(__builtin_fmax( __builtin_fabs(cDD.hi), __builtin_fabs(dDD.hi) ));
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if (isfinite(logbw))
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{
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ilogbw = (int)logbw;
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cDD.hi = scalbn(cDD.hi, -ilogbw);
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cDD.lo = scalbn(cDD.lo, -ilogbw);
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dDD.hi = scalbn(dDD.hi, -ilogbw);
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dDD.lo = scalbn(dDD.lo, -ilogbw);
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}
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const long double denom = __gcc_qadd(__gcc_qmul(cDD.ld, cDD.ld), __gcc_qmul(dDD.ld, dDD.ld));
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const long double realNumerator = __gcc_qadd(__gcc_qmul(a,cDD.ld), __gcc_qmul(b,dDD.ld));
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const long double imagNumerator = __gcc_qsub(__gcc_qmul(b,cDD.ld), __gcc_qmul(a,dDD.ld));
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DD real = { .ld = __gcc_qdiv(realNumerator, denom) };
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DD imag = { .ld = __gcc_qdiv(imagNumerator, denom) };
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real.hi = scalbn(real.hi, -ilogbw);
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real.lo = scalbn(real.lo, -ilogbw);
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imag.hi = scalbn(imag.hi, -ilogbw);
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imag.lo = scalbn(imag.lo, -ilogbw);
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if (isnan(real.hi) && isnan(imag.hi))
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{
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DD aDD = { .ld = a };
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DD bDD = { .ld = b };
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DD rDD = { .ld = denom };
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if ((rDD.hi == 0.0) && (!isnan(aDD.hi) || !isnan(bDD.hi)))
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{
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real.hi = __builtin_copysign(INFINITY,cDD.hi) * aDD.hi;
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real.lo = 0.0;
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imag.hi = __builtin_copysign(INFINITY,cDD.hi) * bDD.hi;
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imag.lo = 0.0;
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}
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else if ((isinf(aDD.hi) || isinf(bDD.hi)) && isfinite(cDD.hi) && isfinite(dDD.hi))
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{
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makeFinite(aDD);
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makeFinite(bDD);
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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 * (bDD.hi*cDD.hi - aDD.hi*dDD.hi);
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imag.lo = 0.0;
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}
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else if ((isinf(cDD.hi) || isinf(dDD.hi)) && isfinite(aDD.hi) && isfinite(bDD.hi))
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{
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makeFinite(cDD);
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makeFinite(dDD);
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real.hi = __builtin_copysign(0.0,(aDD.hi*cDD.hi + bDD.hi*dDD.hi));
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real.lo = 0.0;
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imag.hi = __builtin_copysign(0.0,(bDD.hi*cDD.hi - aDD.hi*dDD.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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