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gerrit-public.fairphone.software / platform / external / compiler-rt / 7d4a9553bd3bc43a310e1d13dd699b79f814d77b / . / lib / ppc / divtc3.c
blob: 299128186312e9430153434e9f24ee43170b8ab2 [file] [log] [blame]
Edward O'Callaghan33c13472009-08-08 04:43:56 +0000[diff] [blame]1/* This file is distributed under the University of Illinois Open Source
2 * License. See LICENSE.TXT for details.
3 */
Daniel Dunbarb3a69012009-06-26 16:47:03 +0000[diff] [blame]4
5#include "DD.h"
Daniel Dunbar86030242011-11-16 07:33:00 +0000[diff] [blame]6#include "../int_math.h"
Daniel Dunbarb3a69012009-06-26 16:47:03 +0000[diff] [blame]7
Daniel Dunbarc25c6d12011-11-16 07:33:06 +0000[diff] [blame]8#if !defined(CRT_INFINITY) && defined(HUGE_VAL)
9#define CRT_INFINITY HUGE_VAL
10#endif /* CRT_INFINITY */
Edward O'Callaghan33c13472009-08-08 04:43:56 +0000[diff] [blame]11
Daniel Dunbar86030242011-11-16 07:33:00 +0000[diff] [blame]12#define makeFinite(x) { \
Daniel Dunbarc25c6d12011-11-16 07:33:06 +0000[diff] [blame]13 (x).s.hi = crt_copysign(crt_isinf((x).s.hi) ? 1.0 : 0.0, (x).s.hi); \
Daniel Dunbar86030242011-11-16 07:33:00 +0000[diff] [blame]14 (x).s.lo = 0.0; \
15 }
Daniel Dunbarb3a69012009-06-26 16:47:03 +0000[diff] [blame]16
17long double __gcc_qadd(long double, long double);
18long double __gcc_qsub(long double, long double);
19long double __gcc_qmul(long double, long double);
20long double __gcc_qdiv(long double, long double);
21
22long double _Complex
23__divtc3(long double a, long double b, long double c, long double d)
24{
25 DD cDD = { .ld = c };
26 DD dDD = { .ld = d };
27
28 int ilogbw = 0;
Daniel Dunbarc25c6d12011-11-16 07:33:06 +0000[diff] [blame]29 const double logbw = crt_logb(crt_fmax(crt_fabs(cDD.s.hi), crt_fabs(dDD.s.hi) ));
Daniel Dunbarb3a69012009-06-26 16:47:03 +0000[diff] [blame]30
Daniel Dunbar86030242011-11-16 07:33:00 +0000[diff] [blame]31 if (crt_isfinite(logbw))
Daniel Dunbarb3a69012009-06-26 16:47:03 +0000[diff] [blame]32 {
33 ilogbw = (int)logbw;
34
Daniel Dunbarc25c6d12011-11-16 07:33:06 +0000[diff] [blame]35 cDD.s.hi = crt_scalbn(cDD.s.hi, -ilogbw);
36 cDD.s.lo = crt_scalbn(cDD.s.lo, -ilogbw);
37 dDD.s.hi = crt_scalbn(dDD.s.hi, -ilogbw);
38 dDD.s.lo = crt_scalbn(dDD.s.lo, -ilogbw);
Daniel Dunbarb3a69012009-06-26 16:47:03 +0000[diff] [blame]39 }
40
41 const long double denom = __gcc_qadd(__gcc_qmul(cDD.ld, cDD.ld), __gcc_qmul(dDD.ld, dDD.ld));
42 const long double realNumerator = __gcc_qadd(__gcc_qmul(a,cDD.ld), __gcc_qmul(b,dDD.ld));
43 const long double imagNumerator = __gcc_qsub(__gcc_qmul(b,cDD.ld), __gcc_qmul(a,dDD.ld));
44
45 DD real = { .ld = __gcc_qdiv(realNumerator, denom) };
46 DD imag = { .ld = __gcc_qdiv(imagNumerator, denom) };
47
Daniel Dunbarc25c6d12011-11-16 07:33:06 +0000[diff] [blame]48 real.s.hi = crt_scalbn(real.s.hi, -ilogbw);
49 real.s.lo = crt_scalbn(real.s.lo, -ilogbw);
50 imag.s.hi = crt_scalbn(imag.s.hi, -ilogbw);
51 imag.s.lo = crt_scalbn(imag.s.lo, -ilogbw);
Daniel Dunbarb3a69012009-06-26 16:47:03 +0000[diff] [blame]52
Daniel Dunbar86030242011-11-16 07:33:00 +0000[diff] [blame]53 if (crt_isnan(real.s.hi) && crt_isnan(imag.s.hi))
Daniel Dunbarb3a69012009-06-26 16:47:03 +0000[diff] [blame]54 {
55 DD aDD = { .ld = a };
56 DD bDD = { .ld = b };
57 DD rDD = { .ld = denom };
58
Daniel Dunbar86030242011-11-16 07:33:00 +0000[diff] [blame]59 if ((rDD.s.hi == 0.0) && (!crt_isnan(aDD.s.hi) ||
60 !crt_isnan(bDD.s.hi)))
Daniel Dunbarb3a69012009-06-26 16:47:03 +0000[diff] [blame]61 {
Daniel Dunbarc25c6d12011-11-16 07:33:06 +0000[diff] [blame]62 real.s.hi = crt_copysign(CRT_INFINITY,cDD.s.hi) * aDD.s.hi;
Edward O'Callaghan8bf1e092009-08-09 18:41:02 +0000[diff] [blame]63 real.s.lo = 0.0;
Daniel Dunbarc25c6d12011-11-16 07:33:06 +0000[diff] [blame]64 imag.s.hi = crt_copysign(CRT_INFINITY,cDD.s.hi) * bDD.s.hi;
Edward O'Callaghan8bf1e092009-08-09 18:41:02 +0000[diff] [blame]65 imag.s.lo = 0.0;
Daniel Dunbarb3a69012009-06-26 16:47:03 +0000[diff] [blame]66 }
67
Daniel Dunbar86030242011-11-16 07:33:00 +0000[diff] [blame]68 else if ((crt_isinf(aDD.s.hi) || crt_isinf(bDD.s.hi)) &&
69 crt_isfinite(cDD.s.hi) && crt_isfinite(dDD.s.hi))
Daniel Dunbarb3a69012009-06-26 16:47:03 +0000[diff] [blame]70 {
71 makeFinite(aDD);
72 makeFinite(bDD);
Daniel Dunbarc25c6d12011-11-16 07:33:06 +0000[diff] [blame]73 real.s.hi = CRT_INFINITY * (aDD.s.hi*cDD.s.hi + bDD.s.hi*dDD.s.hi);
Edward O'Callaghan8bf1e092009-08-09 18:41:02 +0000[diff] [blame]74 real.s.lo = 0.0;
Daniel Dunbarc25c6d12011-11-16 07:33:06 +0000[diff] [blame]75 imag.s.hi = CRT_INFINITY * (bDD.s.hi*cDD.s.hi - aDD.s.hi*dDD.s.hi);
Edward O'Callaghan8bf1e092009-08-09 18:41:02 +0000[diff] [blame]76 imag.s.lo = 0.0;
Daniel Dunbarb3a69012009-06-26 16:47:03 +0000[diff] [blame]77 }
78
Daniel Dunbar86030242011-11-16 07:33:00 +0000[diff] [blame]79 else if ((crt_isinf(cDD.s.hi) || crt_isinf(dDD.s.hi)) &&
80 crt_isfinite(aDD.s.hi) && crt_isfinite(bDD.s.hi))
Daniel Dunbarb3a69012009-06-26 16:47:03 +0000[diff] [blame]81 {
82 makeFinite(cDD);
83 makeFinite(dDD);
Daniel Dunbarc25c6d12011-11-16 07:33:06 +0000[diff] [blame]84 real.s.hi = crt_copysign(0.0,(aDD.s.hi*cDD.s.hi + bDD.s.hi*dDD.s.hi));
Edward O'Callaghan8bf1e092009-08-09 18:41:02 +0000[diff] [blame]85 real.s.lo = 0.0;
Daniel Dunbarc25c6d12011-11-16 07:33:06 +0000[diff] [blame]86 imag.s.hi = crt_copysign(0.0,(bDD.s.hi*cDD.s.hi - aDD.s.hi*dDD.s.hi));
Edward O'Callaghan8bf1e092009-08-09 18:41:02 +0000[diff] [blame]87 imag.s.lo = 0.0;
Daniel Dunbarb3a69012009-06-26 16:47:03 +0000[diff] [blame]88 }
89 }
90
91 long double _Complex z;
92 __real__ z = real.ld;
93 __imag__ z = imag.ld;
94
95 return z;
96}