diff options
Diffstat (limited to 'lib/libm/lgamma_r.c')
| -rw-r--r-- | lib/libm/lgamma_r.c | 66 |
1 files changed, 24 insertions, 42 deletions
diff --git a/lib/libm/lgamma_r.c b/lib/libm/lgamma_r.c index d3f901ae..a6345f11 100644 --- a/lib/libm/lgamma_r.c +++ b/lib/libm/lgamma_r.c @@ -85,20 +85,20 @@ static const double pi = 3.14159265358979311600e+00, /* 0x400921FB, 0x54442D18 */ - a0 = 7.72156649015328655494e-02, /* 0x3FB3C467, 0xE37DB0C8 */ - a1 = 3.22467033424113591611e-01, /* 0x3FD4A34C, 0xC4A60FAD */ - a2 = 6.73523010531292681824e-02, /* 0x3FB13E00, 0x1A5562A7 */ - a3 = 2.05808084325167332806e-02, /* 0x3F951322, 0xAC92547B */ - a4 = 7.38555086081402883957e-03, /* 0x3F7E404F, 0xB68FEFE8 */ - a5 = 2.89051383673415629091e-03, /* 0x3F67ADD8, 0xCCB7926B */ - a6 = 1.19270763183362067845e-03, /* 0x3F538A94, 0x116F3F5D */ - a7 = 5.10069792153511336608e-04, /* 0x3F40B6C6, 0x89B99C00 */ - a8 = 2.20862790713908385557e-04, /* 0x3F2CF2EC, 0xED10E54D */ - a9 = 1.08011567247583939954e-04, /* 0x3F1C5088, 0x987DFB07 */ - a10 = 2.52144565451257326939e-05, /* 0x3EFA7074, 0x428CFA52 */ - a11 = 4.48640949618915160150e-05, /* 0x3F07858E, 0x90A45837 */ - tc = 1.46163214496836224576e+00, /* 0x3FF762D8, 0x6356BE3F */ - tf = -1.21486290535849611461e-01, /* 0xBFBF19B9, 0xBCC38A42 */ + a0 = 7.72156649015328655494e-02, /* 0x3FB3C467, 0xE37DB0C8 */ + a1 = 3.22467033424113591611e-01, /* 0x3FD4A34C, 0xC4A60FAD */ + a2 = 6.73523010531292681824e-02, /* 0x3FB13E00, 0x1A5562A7 */ + a3 = 2.05808084325167332806e-02, /* 0x3F951322, 0xAC92547B */ + a4 = 7.38555086081402883957e-03, /* 0x3F7E404F, 0xB68FEFE8 */ + a5 = 2.89051383673415629091e-03, /* 0x3F67ADD8, 0xCCB7926B */ + a6 = 1.19270763183362067845e-03, /* 0x3F538A94, 0x116F3F5D */ + a7 = 5.10069792153511336608e-04, /* 0x3F40B6C6, 0x89B99C00 */ + a8 = 2.20862790713908385557e-04, /* 0x3F2CF2EC, 0xED10E54D */ + a9 = 1.08011567247583939954e-04, /* 0x3F1C5088, 0x987DFB07 */ + a10 = 2.52144565451257326939e-05, /* 0x3EFA7074, 0x428CFA52 */ + a11 = 4.48640949618915160150e-05, /* 0x3F07858E, 0x90A45837 */ + tc = 1.46163214496836224576e+00, /* 0x3FF762D8, 0x6356BE3F */ + tf = -1.21486290535849611461e-01, /* 0xBFBF19B9, 0xBCC38A42 */ /* tt = -(tail of tf) */ tt = -3.63867699703950536541e-18, /* 0xBC50C7CA, 0xA48A971F */ t0 = 4.83836122723810047042e-01, /* 0x3FDEF72B, 0xC8EE38A2 */ @@ -242,48 +242,32 @@ double __lgamma_r(double x, int *signgamp) switch (i) { case 0: z = y * y; - p1 = a0 + - z * (a2 + - z * (a4 + z * (a6 + z * (a8 + z * a10)))); - p2 = z * - (a1 + - z * (a3 + - z * (a5 + z * (a7 + z * (a9 + z * a11))))); + p1 = a0 + z * (a2 + z * (a4 + z * (a6 + z * (a8 + z * a10)))); + p2 = z * (a1 + z * (a3 + z * (a5 + z * (a7 + z * (a9 + z * a11))))); p = y * p1 + p2; r += (p - 0.5 * y); break; case 1: z = y * y; w = z * y; - p1 = t0 + - w * (t3 + - w * (t6 + w * (t9 + w * t12))); /* parallel - comp - */ + p1 = t0 + w * (t3 + w * (t6 + w * (t9 + w * t12))); /* parallel + comp + */ p2 = t1 + w * (t4 + w * (t7 + w * (t10 + w * t13))); p3 = t2 + w * (t5 + w * (t8 + w * (t11 + w * t14))); p = z * p1 - (tt - w * (p2 + y * p3)); r += tf + p; break; case 2: - p1 = y * - (u0 + - y * (u1 + - y * (u2 + y * (u3 + y * (u4 + y * u5))))); - p2 = 1.0 + - y * (v1 + y * (v2 + y * (v3 + y * (v4 + y * v5)))); + p1 = y * (u0 + y * (u1 + y * (u2 + y * (u3 + y * (u4 + y * u5))))); + p2 = 1.0 + y * (v1 + y * (v2 + y * (v3 + y * (v4 + y * v5)))); r += -0.5 * y + p1 / p2; } } else if (ix < 0x40200000) { /* x < 8.0 */ i = (int)x; y = x - (double)i; - p = y * - (s0 + - y * (s1 + - y * (s2 + y * (s3 + y * (s4 + y * (s5 + y * s6)))))); - q = 1.0 + - y * (r1 + - y * (r2 + y * (r3 + y * (r4 + y * (r5 + y * r6))))); + p = y * (s0 + y * (s1 + y * (s2 + y * (s3 + y * (s4 + y * (s5 + y * s6)))))); + q = 1.0 + y * (r1 + y * (r2 + y * (r3 + y * (r4 + y * (r5 + y * r6))))); r = 0.5 * y + p / q; z = 1.0; /* lgamma(1+s) = log(s) + lgamma(s) */ switch (i) { @@ -304,9 +288,7 @@ double __lgamma_r(double x, int *signgamp) t = log(x); z = 1.0 / x; y = z * z; - w = w0 + - z * (w1 + - y * (w2 + y * (w3 + y * (w4 + y * (w5 + y * w6))))); + w = w0 + z * (w1 + y * (w2 + y * (w3 + y * (w4 + y * (w5 + y * w6))))); r = (x - 0.5) * (t - 1.0) + w; } else /* 2**58 <= x <= inf */ r = x * (log(x) - 1.0); |