forked from OSchip/llvm-project
99 lines
3.0 KiB
C
99 lines
3.0 KiB
C
/* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
* See https://llvm.org/LICENSE.txt for license information.
|
|
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
*/
|
|
|
|
#include "DD.h"
|
|
#include "../int_math.h"
|
|
// Use DOUBLE_PRECISION because the soft-fp method we use is logb (on the upper
|
|
// half of the long doubles), even though this file defines complex division for
|
|
// 128-bit floats.
|
|
#define DOUBLE_PRECISION
|
|
#include "../fp_lib.h"
|
|
|
|
#if !defined(CRT_INFINITY) && defined(HUGE_VAL)
|
|
#define CRT_INFINITY HUGE_VAL
|
|
#endif /* CRT_INFINITY */
|
|
|
|
#define makeFinite(x) { \
|
|
(x).s.hi = crt_copysign(crt_isinf((x).s.hi) ? 1.0 : 0.0, (x).s.hi); \
|
|
(x).s.lo = 0.0; \
|
|
}
|
|
|
|
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 = __compiler_rt_logb(
|
|
crt_fmax(crt_fabs(cDD.s.hi), crt_fabs(dDD.s.hi)));
|
|
|
|
if (crt_isfinite(logbw))
|
|
{
|
|
ilogbw = (int)logbw;
|
|
|
|
cDD.s.hi = crt_scalbn(cDD.s.hi, -ilogbw);
|
|
cDD.s.lo = crt_scalbn(cDD.s.lo, -ilogbw);
|
|
dDD.s.hi = crt_scalbn(dDD.s.hi, -ilogbw);
|
|
dDD.s.lo = crt_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 = crt_scalbn(real.s.hi, -ilogbw);
|
|
real.s.lo = crt_scalbn(real.s.lo, -ilogbw);
|
|
imag.s.hi = crt_scalbn(imag.s.hi, -ilogbw);
|
|
imag.s.lo = crt_scalbn(imag.s.lo, -ilogbw);
|
|
|
|
if (crt_isnan(real.s.hi) && crt_isnan(imag.s.hi))
|
|
{
|
|
DD aDD = { .ld = a };
|
|
DD bDD = { .ld = b };
|
|
DD rDD = { .ld = denom };
|
|
|
|
if ((rDD.s.hi == 0.0) && (!crt_isnan(aDD.s.hi) ||
|
|
!crt_isnan(bDD.s.hi)))
|
|
{
|
|
real.s.hi = crt_copysign(CRT_INFINITY,cDD.s.hi) * aDD.s.hi;
|
|
real.s.lo = 0.0;
|
|
imag.s.hi = crt_copysign(CRT_INFINITY,cDD.s.hi) * bDD.s.hi;
|
|
imag.s.lo = 0.0;
|
|
}
|
|
|
|
else if ((crt_isinf(aDD.s.hi) || crt_isinf(bDD.s.hi)) &&
|
|
crt_isfinite(cDD.s.hi) && crt_isfinite(dDD.s.hi))
|
|
{
|
|
makeFinite(aDD);
|
|
makeFinite(bDD);
|
|
real.s.hi = CRT_INFINITY * (aDD.s.hi*cDD.s.hi + bDD.s.hi*dDD.s.hi);
|
|
real.s.lo = 0.0;
|
|
imag.s.hi = CRT_INFINITY * (bDD.s.hi*cDD.s.hi - aDD.s.hi*dDD.s.hi);
|
|
imag.s.lo = 0.0;
|
|
}
|
|
|
|
else if ((crt_isinf(cDD.s.hi) || crt_isinf(dDD.s.hi)) &&
|
|
crt_isfinite(aDD.s.hi) && crt_isfinite(bDD.s.hi))
|
|
{
|
|
makeFinite(cDD);
|
|
makeFinite(dDD);
|
|
real.s.hi = crt_copysign(0.0,(aDD.s.hi*cDD.s.hi + bDD.s.hi*dDD.s.hi));
|
|
real.s.lo = 0.0;
|
|
imag.s.hi = crt_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;
|
|
}
|