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authornsz <nsz@port70.net>2012-03-19 23:41:19 +0100
committernsz <nsz@port70.net>2012-03-19 23:41:19 +0100
commit0cbb65479147ecdaa664e88cc2a5a925f3de502f (patch)
tree7b6dc53fcec6497d55746d3cc47f167a20b7aa57 /src/math/lgamma_r.c
parentb03255af77776703c8d48819e824d09f6f54ba86 (diff)
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code cleanup of named constants
zero, one, two, half are replaced by const literals The policy was to use the f suffix for float consts (1.0f), but don't use suffix for long double consts (these consts can be exactly represented as double).
Diffstat (limited to 'src/math/lgamma_r.c')
-rw-r--r--src/math/lgamma_r.c50
1 files changed, 23 insertions, 27 deletions
diff --git a/src/math/lgamma_r.c b/src/math/lgamma_r.c
index a8ef1956..e3ed1733 100644
--- a/src/math/lgamma_r.c
+++ b/src/math/lgamma_r.c
@@ -82,8 +82,6 @@
static const double
two52= 4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */
-half= 5.00000000000000000000e-01, /* 0x3FE00000, 0x00000000 */
-one = 1.00000000000000000000e+00, /* 0x3FF00000, 0x00000000 */
pi = 3.14159265358979311600e+00, /* 0x400921FB, 0x54442D18 */
a0 = 7.72156649015328655494e-02, /* 0x3FB3C467, 0xE37DB0C8 */
a1 = 3.22467033424113591611e-01, /* 0x3FD4A34C, 0xC4A60FAD */
@@ -148,8 +146,6 @@ w4 = -5.95187557450339963135e-04, /* 0xBF4380CB, 0x8C0FE741 */
w5 = 8.36339918996282139126e-04, /* 0x3F4B67BA, 0x4CDAD5D1 */
w6 = -1.63092934096575273989e-03; /* 0xBF5AB89D, 0x0B9E43E4 */
-static const double zero = 0.00000000000000000000e+00;
-
static double sin_pi(double x)
{
double y,z;
@@ -159,7 +155,7 @@ static double sin_pi(double x)
ix &= 0x7fffffff;
if (ix < 0x3fd00000)
- return __sin(pi*x, zero, 0);
+ return __sin(pi*x, 0.0, 0);
y = -x; /* negative x is assumed */
@@ -174,7 +170,7 @@ static double sin_pi(double x)
n = (int)(y*4.0);
} else {
if (ix >= 0x43400000) {
- y = zero; /* y must be even */
+ y = 0.0; /* y must be even */
n = 0;
} else {
if (ix < 0x43300000)
@@ -186,14 +182,14 @@ static double sin_pi(double x)
}
}
switch (n) {
- case 0: y = __sin(pi*y, zero, 0); break;
+ case 0: y = __sin(pi*y, 0.0, 0); break;
case 1:
- case 2: y = __cos(pi*(0.5-y), zero); break;
+ case 2: y = __cos(pi*(0.5-y), 0.0); break;
case 3:
- case 4: y = __sin(pi*(one-y), zero, 0); break;
+ case 4: y = __sin(pi*(1.0-y), 0.0, 0); break;
case 5:
- case 6: y = -__cos(pi*(y-1.5), zero); break;
- default: y = __sin(pi*(y-2.0), zero, 0); break;
+ case 6: y = -__cos(pi*(y-1.5), 0.0); break;
+ default: y = __sin(pi*(y-2.0), 0.0, 0); break;
}
return -y;
}
@@ -213,7 +209,7 @@ double __lgamma_r(double x, int *signgamp)
if (ix >= 0x7ff00000)
return x*x;
if ((ix|lx) == 0)
- return one/zero;
+ return 1.0/0.0;
if (ix < 0x3b900000) { /* |x|<2**-70, return -log(|x|) */
if(hx < 0) {
*signgamp = -1;
@@ -223,12 +219,12 @@ double __lgamma_r(double x, int *signgamp)
}
if (hx < 0) {
if (ix >= 0x43300000) /* |x|>=2**52, must be -integer */
- return one/zero;
+ return 1.0/0.0;
t = sin_pi(x);
- if (t == zero) /* -integer */
- return one/zero;
+ if (t == 0.0) /* -integer */
+ return 1.0/0.0;
nadj = log(pi/fabs(t*x));
- if (t < zero)
+ if (t < 0.0)
*signgamp = -1;
x = -x;
}
@@ -241,17 +237,17 @@ double __lgamma_r(double x, int *signgamp)
if (ix <= 0x3feccccc) { /* lgamma(x) = lgamma(x+1)-log(x) */
r = -log(x);
if (ix >= 0x3FE76944) {
- y = one - x;
+ y = 1.0 - x;
i = 0;
} else if (ix >= 0x3FCDA661) {
- y = x - (tc-one);
+ y = x - (tc-1.0);
i = 1;
} else {
y = x;
i = 2;
}
} else {
- r = zero;
+ r = 0.0;
if (ix >= 0x3FFBB4C3) { /* [1.7316,2] */
y = 2.0 - x;
i = 0;
@@ -259,7 +255,7 @@ double __lgamma_r(double x, int *signgamp)
y = x - tc;
i = 1;
} else {
- y = x - one;
+ y = x - 1.0;
i = 2;
}
}
@@ -282,16 +278,16 @@ double __lgamma_r(double x, int *signgamp)
break;
case 2:
p1 = y*(u0+y*(u1+y*(u2+y*(u3+y*(u4+y*u5)))));
- p2 = one+y*(v1+y*(v2+y*(v3+y*(v4+y*v5))));
+ 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 = one+y*(r1+y*(r2+y*(r3+y*(r4+y*(r5+y*r6)))));
- r = half*y+p/q;
- z = one; /* lgamma(1+s) = log(s) + lgamma(s) */
+ 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) {
case 7: z *= y + 6.0; /* FALLTHRU */
case 6: z *= y + 5.0; /* FALLTHRU */
@@ -303,12 +299,12 @@ double __lgamma_r(double x, int *signgamp)
}
} else if (ix < 0x43900000) { /* 8.0 <= x < 2**58 */
t = log(x);
- z = one/x;
+ z = 1.0/x;
y = z*z;
w = w0+z*(w1+y*(w2+y*(w3+y*(w4+y*(w5+y*w6)))));
- r = (x-half)*(t-one)+w;
+ r = (x-0.5)*(t-1.0)+w;
} else /* 2**58 <= x <= inf */
- r = x*(log(x)-one);
+ r = x*(log(x)-1.0);
if (hx < 0)
r = nadj - r;
return r;