forked from OSchip/llvm-project
94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/* This file is distributed under the University of Illinois Open Source
|
|
* License. See LICENSE.TXT for details.
|
|
*/
|
|
|
|
#include "DD.h"
|
|
#include <math.h>
|
|
|
|
#if !defined(INFINITY) && defined(HUGE_VAL)
|
|
#define INFINITY HUGE_VAL
|
|
#endif /* INFINITY */
|
|
|
|
#define makeFinite(x) { \
|
|
(x).s.hi = __builtin_copysign(isinf((x).s.hi) ? 1.0 : 0.0, (x).s.hi); \
|
|
(x).s.lo = 0.0; \
|
|
}
|
|
|
|
long double __gcc_qadd(long double, long double);
|
|
long double __gcc_qsub(long double, long double);
|
|
long double __gcc_qmul(long double, long double);
|
|
long double __gcc_qdiv(long double, long double);
|
|
|
|
long double _Complex
|
|
__divtc3(long double a, long double b, long double c, long double d)
|
|
{
|
|
DD cDD = { .ld = c };
|
|
DD dDD = { .ld = d };
|
|
|
|
int ilogbw = 0;
|
|
const double logbw = logb(__builtin_fmax( __builtin_fabs(cDD.s.hi), __builtin_fabs(dDD.s.hi) ));
|
|
|
|
if (isfinite(logbw))
|
|
{
|
|
ilogbw = (int)logbw;
|
|
|
|
cDD.s.hi = scalbn(cDD.s.hi, -ilogbw);
|
|
cDD.s.lo = scalbn(cDD.s.lo, -ilogbw);
|
|
dDD.s.hi = scalbn(dDD.s.hi, -ilogbw);
|
|
dDD.s.lo = scalbn(dDD.s.lo, -ilogbw);
|
|
}
|
|
|
|
const long double denom = __gcc_qadd(__gcc_qmul(cDD.ld, cDD.ld), __gcc_qmul(dDD.ld, dDD.ld));
|
|
const long double realNumerator = __gcc_qadd(__gcc_qmul(a,cDD.ld), __gcc_qmul(b,dDD.ld));
|
|
const long double imagNumerator = __gcc_qsub(__gcc_qmul(b,cDD.ld), __gcc_qmul(a,dDD.ld));
|
|
|
|
DD real = { .ld = __gcc_qdiv(realNumerator, denom) };
|
|
DD imag = { .ld = __gcc_qdiv(imagNumerator, denom) };
|
|
|
|
real.s.hi = scalbn(real.s.hi, -ilogbw);
|
|
real.s.lo = scalbn(real.s.lo, -ilogbw);
|
|
imag.s.hi = scalbn(imag.s.hi, -ilogbw);
|
|
imag.s.lo = scalbn(imag.s.lo, -ilogbw);
|
|
|
|
if (isnan(real.s.hi) && isnan(imag.s.hi))
|
|
{
|
|
DD aDD = { .ld = a };
|
|
DD bDD = { .ld = b };
|
|
DD rDD = { .ld = denom };
|
|
|
|
if ((rDD.s.hi == 0.0) && (!isnan(aDD.s.hi) || !isnan(bDD.s.hi)))
|
|
{
|
|
real.s.hi = __builtin_copysign(INFINITY,cDD.s.hi) * aDD.s.hi;
|
|
real.s.lo = 0.0;
|
|
imag.s.hi = __builtin_copysign(INFINITY,cDD.s.hi) * bDD.s.hi;
|
|
imag.s.lo = 0.0;
|
|
}
|
|
|
|
else if ((isinf(aDD.s.hi) || isinf(bDD.s.hi)) && isfinite(cDD.s.hi) && isfinite(dDD.s.hi))
|
|
{
|
|
makeFinite(aDD);
|
|
makeFinite(bDD);
|
|
real.s.hi = INFINITY * (aDD.s.hi*cDD.s.hi + bDD.s.hi*dDD.s.hi);
|
|
real.s.lo = 0.0;
|
|
imag.s.hi = INFINITY * (bDD.s.hi*cDD.s.hi - aDD.s.hi*dDD.s.hi);
|
|
imag.s.lo = 0.0;
|
|
}
|
|
|
|
else if ((isinf(cDD.s.hi) || isinf(dDD.s.hi)) && isfinite(aDD.s.hi) && isfinite(bDD.s.hi))
|
|
{
|
|
makeFinite(cDD);
|
|
makeFinite(dDD);
|
|
real.s.hi = __builtin_copysign(0.0,(aDD.s.hi*cDD.s.hi + bDD.s.hi*dDD.s.hi));
|
|
real.s.lo = 0.0;
|
|
imag.s.hi = __builtin_copysign(0.0,(bDD.s.hi*cDD.s.hi - aDD.s.hi*dDD.s.hi));
|
|
imag.s.lo = 0.0;
|
|
}
|
|
}
|
|
|
|
long double _Complex z;
|
|
__real__ z = real.ld;
|
|
__imag__ z = imag.ld;
|
|
|
|
return z;
|
|
}
|