forked from OSchip/llvm-project
97 lines
3.2 KiB
C
97 lines
3.2 KiB
C
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "../int_math.h"
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#include "DD.h"
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// Use DOUBLE_PRECISION because the soft-fp method we use is logb (on the upper
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// half of the long doubles), even though this file defines complex division for
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// 128-bit floats.
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#define DOUBLE_PRECISION
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#include "../fp_lib.h"
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#if !defined(CRT_INFINITY) && defined(HUGE_VAL)
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#define CRT_INFINITY HUGE_VAL
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#endif // CRT_INFINITY
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#define makeFinite(x) \
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{ \
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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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long double _Complex __divtc3(long double a, long double b, long double c,
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long double d) {
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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 =
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__compiler_rt_logb(crt_fmax(crt_fabs(cDD.s.hi), crt_fabs(dDD.s.hi)));
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if (crt_isfinite(logbw)) {
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ilogbw = (int)logbw;
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cDD.s.hi = crt_scalbn(cDD.s.hi, -ilogbw);
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cDD.s.lo = crt_scalbn(cDD.s.lo, -ilogbw);
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dDD.s.hi = crt_scalbn(dDD.s.hi, -ilogbw);
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dDD.s.lo = crt_scalbn(dDD.s.lo, -ilogbw);
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}
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const long double denom =
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__gcc_qadd(__gcc_qmul(cDD.ld, cDD.ld), __gcc_qmul(dDD.ld, dDD.ld));
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const long double realNumerator =
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__gcc_qadd(__gcc_qmul(a, cDD.ld), __gcc_qmul(b, dDD.ld));
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const long double imagNumerator =
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__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.s.hi = crt_scalbn(real.s.hi, -ilogbw);
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real.s.lo = crt_scalbn(real.s.lo, -ilogbw);
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imag.s.hi = crt_scalbn(imag.s.hi, -ilogbw);
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imag.s.lo = crt_scalbn(imag.s.lo, -ilogbw);
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if (crt_isnan(real.s.hi) && crt_isnan(imag.s.hi)) {
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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.s.hi == 0.0) && (!crt_isnan(aDD.s.hi) || !crt_isnan(bDD.s.hi))) {
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real.s.hi = crt_copysign(CRT_INFINITY, cDD.s.hi) * aDD.s.hi;
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real.s.lo = 0.0;
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imag.s.hi = crt_copysign(CRT_INFINITY, cDD.s.hi) * bDD.s.hi;
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imag.s.lo = 0.0;
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}
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else if ((crt_isinf(aDD.s.hi) || crt_isinf(bDD.s.hi)) &&
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crt_isfinite(cDD.s.hi) && crt_isfinite(dDD.s.hi)) {
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makeFinite(aDD);
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makeFinite(bDD);
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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 * (bDD.s.hi * cDD.s.hi - aDD.s.hi * dDD.s.hi);
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imag.s.lo = 0.0;
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}
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else if ((crt_isinf(cDD.s.hi) || crt_isinf(dDD.s.hi)) &&
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crt_isfinite(aDD.s.hi) && crt_isfinite(bDD.s.hi)) {
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makeFinite(cDD);
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makeFinite(dDD);
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real.s.hi =
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crt_copysign(0.0, (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 =
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crt_copysign(0.0, (bDD.s.hi * cDD.s.hi - aDD.s.hi * dDD.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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