diff options
Diffstat (limited to 'src/math/lgammal.c')
| -rw-r--r-- | src/math/lgammal.c | 48 |
1 files changed, 22 insertions, 26 deletions
diff --git a/src/math/lgammal.c b/src/math/lgammal.c index ec7c9a04..8fae1be8 100644 --- a/src/math/lgammal.c +++ b/src/math/lgammal.c @@ -95,8 +95,6 @@ long double __lgammal_r(long double x, int *sg) } #elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 static const long double -half = 0.5L, -one = 1.0L, pi = 3.14159265358979323846264L, two63 = 9.223372036854775808e18L, @@ -200,8 +198,6 @@ w5 = 8.412723297322498080632E-4L, w6 = -1.880801938119376907179E-3L, w7 = 4.885026142432270781165E-3L; -static const long double zero = 0.0L; - static long double sin_pi(long double x) { long double y, z; @@ -226,7 +222,7 @@ static long double sin_pi(long double x) n = (int) (y*4.0); } else { if (ix >= 0x403f8000) { /* 2^64 */ - y = zero; /* y must be even */ + y = 0.0; /* y must be even */ n = 0; } else { if (ix < 0x403e8000) /* 2^63 */ @@ -244,11 +240,11 @@ static long double sin_pi(long double x) break; case 1: case 2: - y = cosl(pi * (half - y)); + y = cosl(pi * (0.5 - y)); break; case 3: case 4: - y = sinl(pi * (one - y)); + y = sinl(pi * (1.0 - y)); break; case 5: case 6: @@ -273,7 +269,7 @@ long double __lgammal_r(long double x, int *sg) { if ((ix | i0 | i1) == 0) { if (se & 0x8000) *sg = -1; - return one / fabsl(x); + return 1.0 / fabsl(x); } ix = (ix << 16) | (i0 >> 16); @@ -291,10 +287,10 @@ long double __lgammal_r(long double x, int *sg) { } if (se & 0x8000) { t = sin_pi (x); - if (t == zero) - return one / fabsl(t); /* -integer */ + if (t == 0.0) + return 1.0 / fabsl(t); /* -integer */ nadj = logl(pi / fabsl(t * x)); - if (t < zero) + if (t < 0.0) *sg = -1; x = -x; } @@ -306,19 +302,19 @@ long double __lgammal_r(long double x, int *sg) { else if (ix < 0x40008000) { /* x < 2.0 */ if (ix <= 0x3ffee666) { /* 8.99993896484375e-1 */ /* lgamma(x) = lgamma(x+1) - log(x) */ - r = -logl (x); + r = -logl(x); if (ix >= 0x3ffebb4a) { /* 7.31597900390625e-1 */ - y = x - one; + y = x - 1.0; i = 0; } else if (ix >= 0x3ffced33) { /* 2.31639862060546875e-1 */ - y = x - (tc - one); + y = x - (tc - 1.0); i = 1; } else { /* x < 0.23 */ y = x; i = 2; } } else { - r = zero; + r = 0.0; if (ix >= 0x3fffdda6) { /* 1.73162841796875 */ /* [1.7316,2] */ y = x - 2.0; @@ -329,7 +325,7 @@ long double __lgammal_r(long double x, int *sg) { i = 1; } else { /* [0.9, 1.23] */ - y = x - one; + y = x - 1.0; i = 2; } } @@ -337,7 +333,7 @@ long double __lgammal_r(long double x, int *sg) { case 0: p1 = a0 + y * (a1 + y * (a2 + y * (a3 + y * (a4 + y * a5)))); p2 = b0 + y * (b1 + y * (b2 + y * (b3 + y * (b4 + y)))); - r += half * y + y * p1/p2; + r += 0.5 * y + y * p1/p2; break; case 1: p1 = g0 + y * (g1 + y * (g2 + y * (g3 + y * (g4 + y * (g5 + y * g6))))); @@ -348,17 +344,17 @@ long double __lgammal_r(long double x, int *sg) { case 2: p1 = y * (u0 + y * (u1 + y * (u2 + y * (u3 + y * (u4 + y * (u5 + y * u6)))))); p2 = v0 + y * (v1 + y * (v2 + y * (v3 + y * (v4 + y * (v5 + y))))); - r += (-half * y + p1 / p2); + r += (-0.5 * y + p1 / p2); } } else if (ix < 0x40028000) { /* 8.0 */ /* x < 8.0 */ i = (int)x; - t = zero; + t = 0.0; y = x - (double)i; p = y * (s0 + y * (s1 + y * (s2 + y * (s3 + y * (s4 + y * (s5 + y * s6)))))); q = r0 + y * (r1 + y * (r2 + y * (r3 + y * (r4 + y * (r5 + y * (r6 + y)))))); - r = half * y + p / q; - z = one;/* lgamma(1+s) = log(s) + lgamma(s) */ + r = 0.5 * y + p / q; + z = 1.0;/* lgamma(1+s) = log(s) + lgamma(s) */ switch (i) { case 7: z *= (y + 6.0); /* FALLTHRU */ @@ -370,18 +366,18 @@ long double __lgammal_r(long double x, int *sg) { z *= (y + 3.0); /* FALLTHRU */ case 3: z *= (y + 2.0); /* FALLTHRU */ - r += logl (z); + r += logl(z); break; } } else if (ix < 0x40418000) { /* 2^66 */ /* 8.0 <= x < 2**66 */ - t = logl (x); - z = one / x; + t = logl(x); + z = 1.0 / x; y = z * z; w = w0 + z * (w1 + y * (w2 + y * (w3 + y * (w4 + y * (w5 + y * (w6 + y * w7)))))); - r = (x - half) * (t - one) + w; + r = (x - 0.5) * (t - 1.0) + w; } else /* 2**66 <= x <= inf */ - r = x * (logl (x) - one); + r = x * (logl(x) - 1.0); if (se & 0x8000) r = nadj - r; return r; |