1 /* @(#)er_lgamma.c 5.1 93/09/24 */
2 /*
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 *
6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this
8 * software is freely granted, provided that this notice
9 * is preserved.
10 * ====================================================
11 */
12
13 /* lgamma_r(x, signgamp)
14 * Reentrant version of the logarithm of the Gamma function
15 * with user provide pointer for the sign of Gamma(x).
16 *
17 * Method:
18 * 1. Argument Reduction for 0 < x <= 8
19 * Since gamma(1+s)=s*gamma(s), for x in [0,8], we may
20 * reduce x to a number in [1.5,2.5] by
21 * lgamma(1+s) = log(s) + lgamma(s)
22 * for example,
23 * lgamma(7.3) = log(6.3) + lgamma(6.3)
24 * = log(6.3*5.3) + lgamma(5.3)
25 * = log(6.3*5.3*4.3*3.3*2.3) + lgamma(2.3)
26 * 2. Polynomial approximation of lgamma around its
27 * minimum ymin=1.461632144968362245 to maintain monotonicity.
28 * On [ymin-0.23, ymin+0.27] (i.e., [1.23164,1.73163]), use
29 * Let z = x-ymin;
30 * lgamma(x) = -1.214862905358496078218 + z^2*poly(z)
31 * where
32 * poly(z) is a 14 degree polynomial.
33 * 2. Rational approximation in the primary interval [2,3]
34 * We use the following approximation:
35 * s = x-2.0;
36 * lgamma(x) = 0.5*s + s*P(s)/Q(s)
37 * with accuracy
38 * |P/Q - (lgamma(x)-0.5s)| < 2**-61.71
39 * Our algorithms are based on the following observation
40 *
41 * zeta(2)-1 2 zeta(3)-1 3
42 * lgamma(2+s) = s*(1-Euler) + --------- * s - --------- * s + ...
43 * 2 3
44 *
45 * where Euler = 0.5771... is the Euler constant, which is very
46 * close to 0.5.
47 *
48 * 3. For x>=8, we have
49 * lgamma(x)~(x-0.5)log(x)-x+0.5*log(2pi)+1/(12x)-1/(360x**3)+....
50 * (better formula:
51 * lgamma(x)~(x-0.5)*(log(x)-1)-.5*(log(2pi)-1) + ...)
52 * Let z = 1/x, then we approximation
53 * f(z) = lgamma(x) - (x-0.5)(log(x)-1)
54 * by
55 * 3 5 11
56 * w = w0 + w1*z + w2*z + w3*z + ... + w6*z
57 * where
58 * |w - f(z)| < 2**-58.74
59 *
60 * 4. For negative x, since (G is gamma function)
61 * -x*G(-x)*G(x) = pi/sin(pi*x),
62 * we have
63 * G(x) = pi/(sin(pi*x)*(-x)*G(-x))
64 * since G(-x) is positive, sign(G(x)) = sign(sin(pi*x)) for x<0
65 * Hence, for x<0, signgam = sign(sin(pi*x)) and
66 * lgamma(x) = log(|Gamma(x)|)
67 * = log(pi/(|x*sin(pi*x)|)) - lgamma(-x);
68 * Note: one should avoid compute pi*(-x) directly in the
69 * computation of sin(pi*(-x)).
70 *
71 * 5. Special Cases
72 * lgamma(2+s) ~ s*(1-Euler) for tiny s
73 * lgamma(1)=lgamma(2)=0
74 * lgamma(x) ~ -log(x) for tiny x
75 * lgamma(0) = lgamma(inf) = inf
76 * lgamma(-integer) = +-inf
77 *
78 */
79
80 #include "math.h"
81 #include "math_private.h"
82
83 static const double
84 two52= 4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */
85 half= 5.00000000000000000000e-01, /* 0x3FE00000, 0x00000000 */
86 one = 1.00000000000000000000e+00, /* 0x3FF00000, 0x00000000 */
87 pi = 3.14159265358979311600e+00, /* 0x400921FB, 0x54442D18 */
88 a0 = 7.72156649015328655494e-02, /* 0x3FB3C467, 0xE37DB0C8 */
89 a1 = 3.22467033424113591611e-01, /* 0x3FD4A34C, 0xC4A60FAD */
90 a2 = 6.73523010531292681824e-02, /* 0x3FB13E00, 0x1A5562A7 */
91 a3 = 2.05808084325167332806e-02, /* 0x3F951322, 0xAC92547B */
92 a4 = 7.38555086081402883957e-03, /* 0x3F7E404F, 0xB68FEFE8 */
93 a5 = 2.89051383673415629091e-03, /* 0x3F67ADD8, 0xCCB7926B */
94 a6 = 1.19270763183362067845e-03, /* 0x3F538A94, 0x116F3F5D */
95 a7 = 5.10069792153511336608e-04, /* 0x3F40B6C6, 0x89B99C00 */
96 a8 = 2.20862790713908385557e-04, /* 0x3F2CF2EC, 0xED10E54D */
97 a9 = 1.08011567247583939954e-04, /* 0x3F1C5088, 0x987DFB07 */
98 a10 = 2.52144565451257326939e-05, /* 0x3EFA7074, 0x428CFA52 */
99 a11 = 4.48640949618915160150e-05, /* 0x3F07858E, 0x90A45837 */
100 tc = 1.46163214496836224576e+00, /* 0x3FF762D8, 0x6356BE3F */
101 tf = -1.21486290535849611461e-01, /* 0xBFBF19B9, 0xBCC38A42 */
102 /* tt = -(tail of tf) */
103 tt = -3.63867699703950536541e-18, /* 0xBC50C7CA, 0xA48A971F */
104 t0 = 4.83836122723810047042e-01, /* 0x3FDEF72B, 0xC8EE38A2 */
105 t1 = -1.47587722994593911752e-01, /* 0xBFC2E427, 0x8DC6C509 */
106 t2 = 6.46249402391333854778e-02, /* 0x3FB08B42, 0x94D5419B */
107 t3 = -3.27885410759859649565e-02, /* 0xBFA0C9A8, 0xDF35B713 */
108 t4 = 1.79706750811820387126e-02, /* 0x3F9266E7, 0x970AF9EC */
109 t5 = -1.03142241298341437450e-02, /* 0xBF851F9F, 0xBA91EC6A */
110 t6 = 6.10053870246291332635e-03, /* 0x3F78FCE0, 0xE370E344 */
111 t7 = -3.68452016781138256760e-03, /* 0xBF6E2EFF, 0xB3E914D7 */
112 t8 = 2.25964780900612472250e-03, /* 0x3F6282D3, 0x2E15C915 */
113 t9 = -1.40346469989232843813e-03, /* 0xBF56FE8E, 0xBF2D1AF1 */
114 t10 = 8.81081882437654011382e-04, /* 0x3F4CDF0C, 0xEF61A8E9 */
115 t11 = -5.38595305356740546715e-04, /* 0xBF41A610, 0x9C73E0EC */
116 t12 = 3.15632070903625950361e-04, /* 0x3F34AF6D, 0x6C0EBBF7 */
117 t13 = -3.12754168375120860518e-04, /* 0xBF347F24, 0xECC38C38 */
118 t14 = 3.35529192635519073543e-04, /* 0x3F35FD3E, 0xE8C2D3F4 */
119 u0 = -7.72156649015328655494e-02, /* 0xBFB3C467, 0xE37DB0C8 */
120 u1 = 6.32827064025093366517e-01, /* 0x3FE4401E, 0x8B005DFF */
121 u2 = 1.45492250137234768737e+00, /* 0x3FF7475C, 0xD119BD6F */
122 u3 = 9.77717527963372745603e-01, /* 0x3FEF4976, 0x44EA8450 */
123 u4 = 2.28963728064692451092e-01, /* 0x3FCD4EAE, 0xF6010924 */
124 u5 = 1.33810918536787660377e-02, /* 0x3F8B678B, 0xBF2BAB09 */
125 v1 = 2.45597793713041134822e+00, /* 0x4003A5D7, 0xC2BD619C */
126 v2 = 2.12848976379893395361e+00, /* 0x40010725, 0xA42B18F5 */
127 v3 = 7.69285150456672783825e-01, /* 0x3FE89DFB, 0xE45050AF */
128 v4 = 1.04222645593369134254e-01, /* 0x3FBAAE55, 0xD6537C88 */
129 v5 = 3.21709242282423911810e-03, /* 0x3F6A5ABB, 0x57D0CF61 */
130 s0 = -7.72156649015328655494e-02, /* 0xBFB3C467, 0xE37DB0C8 */
131 s1 = 2.14982415960608852501e-01, /* 0x3FCB848B, 0x36E20878 */
132 s2 = 3.25778796408930981787e-01, /* 0x3FD4D98F, 0x4F139F59 */
133 s3 = 1.46350472652464452805e-01, /* 0x3FC2BB9C, 0xBEE5F2F7 */
134 s4 = 2.66422703033638609560e-02, /* 0x3F9B481C, 0x7E939961 */
135 s5 = 1.84028451407337715652e-03, /* 0x3F5E26B6, 0x7368F239 */
136 s6 = 3.19475326584100867617e-05, /* 0x3F00BFEC, 0xDD17E945 */
137 r1 = 1.39200533467621045958e+00, /* 0x3FF645A7, 0x62C4AB74 */
138 r2 = 7.21935547567138069525e-01, /* 0x3FE71A18, 0x93D3DCDC */
139 r3 = 1.71933865632803078993e-01, /* 0x3FC601ED, 0xCCFBDF27 */
140 r4 = 1.86459191715652901344e-02, /* 0x3F9317EA, 0x742ED475 */
141 r5 = 7.77942496381893596434e-04, /* 0x3F497DDA, 0xCA41A95B */
142 r6 = 7.32668430744625636189e-06, /* 0x3EDEBAF7, 0xA5B38140 */
143 w0 = 4.18938533204672725052e-01, /* 0x3FDACFE3, 0x90C97D69 */
144 w1 = 8.33333333333329678849e-02, /* 0x3FB55555, 0x5555553B */
145 w2 = -2.77777777728775536470e-03, /* 0xBF66C16C, 0x16B02E5C */
146 w3 = 7.93650558643019558500e-04, /* 0x3F4A019F, 0x98CF38B6 */
147 w4 = -5.95187557450339963135e-04, /* 0xBF4380CB, 0x8C0FE741 */
148 w5 = 8.36339918996282139126e-04, /* 0x3F4B67BA, 0x4CDAD5D1 */
149 w6 = -1.63092934096575273989e-03; /* 0xBF5AB89D, 0x0B9E43E4 */
150
151 static const double zero= 0.00000000000000000000e+00;
152
153 static double
sin_pi(double x)154 sin_pi(double x)
155 {
156 double y,z;
157 int n,ix;
158
159 GET_HIGH_WORD(ix,x);
160 ix &= 0x7fffffff;
161
162 if(ix<0x3fd00000) return __kernel_sin(pi*x,zero,0);
163 y = -x; /* x is assume negative */
164
165 /*
166 * argument reduction, make sure inexact flag not raised if input
167 * is an integer
168 */
169 z = floor(y);
170 if(z!=y) { /* inexact anyway */
171 y *= 0.5;
172 y = 2.0*(y - floor(y)); /* y = |x| mod 2.0 */
173 n = (int) (y*4.0);
174 } else {
175 if(ix>=0x43400000) {
176 y = zero; n = 0; /* y must be even */
177 } else {
178 if(ix<0x43300000) z = y+two52; /* exact */
179 GET_LOW_WORD(n,z);
180 n &= 1;
181 y = n;
182 n<<= 2;
183 }
184 }
185 switch (n) {
186 case 0: y = __kernel_sin(pi*y,zero,0); break;
187 case 1:
188 case 2: y = __kernel_cos(pi*(0.5-y),zero); break;
189 case 3:
190 case 4: y = __kernel_sin(pi*(one-y),zero,0); break;
191 case 5:
192 case 6: y = -__kernel_cos(pi*(y-1.5),zero); break;
193 default: y = __kernel_sin(pi*(y-2.0),zero,0); break;
194 }
195 return -y;
196 }
197
198
199 double
lgamma_r(double x,int * signgamp)200 lgamma_r(double x, int *signgamp)
201 {
202 double t,y,z,nadj,p,p1,p2,p3,q,r,w;
203 int i,hx,lx,ix;
204
205 EXTRACT_WORDS(hx,lx,x);
206
207 /* purge off +-inf, NaN, +-0, and negative arguments */
208 *signgamp = 1;
209 ix = hx&0x7fffffff;
210 if(ix>=0x7ff00000) return x*x;
211 if((ix|lx)==0) {
212 if(hx<0)
213 *signgamp = -1;
214 return one/zero;
215 }
216 if(ix<0x3b900000) { /* |x|<2**-70, return -log(|x|) */
217 if(hx<0) {
218 *signgamp = -1;
219 return - log(-x);
220 } else return - log(x);
221 }
222 if(hx<0) {
223 if(ix>=0x43300000) /* |x|>=2**52, must be -integer */
224 return one/zero;
225 t = sin_pi(x);
226 if(t==zero) return one/zero; /* -integer */
227 nadj = log(pi/fabs(t*x));
228 if(t<zero) *signgamp = -1;
229 x = -x;
230 }
231
232 /* purge off 1 and 2 */
233 if((((ix-0x3ff00000)|lx)==0)||(((ix-0x40000000)|lx)==0)) r = 0;
234 /* for x < 2.0 */
235 else if(ix<0x40000000) {
236 if(ix<=0x3feccccc) { /* lgamma(x) = lgamma(x+1)-log(x) */
237 r = - log(x);
238 if(ix>=0x3FE76944) {y = one-x; i= 0;}
239 else if(ix>=0x3FCDA661) {y= x-(tc-one); i=1;}
240 else {y = x; i=2;}
241 } else {
242 r = zero;
243 if(ix>=0x3FFBB4C3) {y=2.0-x;i=0;} /* [1.7316,2] */
244 else if(ix>=0x3FF3B4C4) {y=x-tc;i=1;} /* [1.23,1.73] */
245 else {y=x-one;i=2;}
246 }
247 switch(i) {
248 case 0:
249 z = y*y;
250 p1 = a0+z*(a2+z*(a4+z*(a6+z*(a8+z*a10))));
251 p2 = z*(a1+z*(a3+z*(a5+z*(a7+z*(a9+z*a11)))));
252 p = y*p1+p2;
253 r += (p-0.5*y); break;
254 case 1:
255 z = y*y;
256 w = z*y;
257 p1 = t0+w*(t3+w*(t6+w*(t9 +w*t12))); /* parallel comp */
258 p2 = t1+w*(t4+w*(t7+w*(t10+w*t13)));
259 p3 = t2+w*(t5+w*(t8+w*(t11+w*t14)));
260 p = z*p1-(tt-w*(p2+y*p3));
261 r += (tf + p); break;
262 case 2:
263 p1 = y*(u0+y*(u1+y*(u2+y*(u3+y*(u4+y*u5)))));
264 p2 = one+y*(v1+y*(v2+y*(v3+y*(v4+y*v5))));
265 r += (-0.5*y + p1/p2);
266 }
267 }
268 else if(ix<0x40200000) { /* x < 8.0 */
269 i = (int)x;
270 t = zero;
271 y = x-(double)i;
272 p = y*(s0+y*(s1+y*(s2+y*(s3+y*(s4+y*(s5+y*s6))))));
273 q = one+y*(r1+y*(r2+y*(r3+y*(r4+y*(r5+y*r6)))));
274 r = half*y+p/q;
275 z = one; /* lgamma(1+s) = log(s) + lgamma(s) */
276 switch(i) {
277 case 7: z *= (y+6.0); /* FALLTHRU */
278 case 6: z *= (y+5.0); /* FALLTHRU */
279 case 5: z *= (y+4.0); /* FALLTHRU */
280 case 4: z *= (y+3.0); /* FALLTHRU */
281 case 3: z *= (y+2.0); /* FALLTHRU */
282 r += log(z); break;
283 }
284 /* 8.0 <= x < 2**58 */
285 } else if (ix < 0x43900000) {
286 t = log(x);
287 z = one/x;
288 y = z*z;
289 w = w0+z*(w1+y*(w2+y*(w3+y*(w4+y*(w5+y*w6)))));
290 r = (x-half)*(t-one)+w;
291 } else
292 /* 2**58 <= x <= inf */
293 r = x*(log(x)-one);
294 if(hx<0) r = nadj - r;
295 return r;
296 }
297 DEF_NONSTD(lgamma_r);
298