diff options
Diffstat (limited to 'src/math/j0f.c')
| -rw-r--r-- | src/math/j0f.c | 39 |
1 files changed, 18 insertions, 21 deletions
diff --git a/src/math/j0f.c b/src/math/j0f.c index 52cb0ab4..2ee2824b 100644 --- a/src/math/j0f.c +++ b/src/math/j0f.c @@ -19,7 +19,6 @@ static float pzerof(float), qzerof(float); static const float huge = 1e30, -one = 1.0, invsqrtpi = 5.6418961287e-01, /* 0x3f106ebb */ tpi = 6.3661974669e-01, /* 0x3f22f983 */ /* R0/S0 on [0, 2.00] */ @@ -32,8 +31,6 @@ S02 = 1.1692678527e-04, /* 0x38f53697 */ S03 = 5.1354652442e-07, /* 0x3509daa6 */ S04 = 1.1661400734e-09; /* 0x30a045e8 */ -static const float zero = 0.0; - float j0f(float x) { float z, s,c,ss,cc,r,u,v; @@ -42,7 +39,7 @@ float j0f(float x) GET_FLOAT_WORD(hx, x); ix = hx & 0x7fffffff; if (ix >= 0x7f800000) - return one/(x*x); + return 1.0f/(x*x); x = fabsf(x); if (ix >= 0x40000000) { /* |x| >= 2.0 */ s = sinf(x); @@ -51,7 +48,7 @@ float j0f(float x) cc = s+c; if (ix < 0x7f000000) { /* make sure x+x does not overflow */ z = -cosf(x+x); - if (s*c < zero) + if (s*c < 0.0f) cc = z/ss; else ss = z/cc; @@ -71,20 +68,20 @@ float j0f(float x) } if (ix < 0x39000000) { /* |x| < 2**-13 */ /* raise inexact if x != 0 */ - if (huge+x > one) { + if (huge+x > 1.0f) { if (ix < 0x32000000) /* |x| < 2**-27 */ - return one; - return one - 0.25f*x*x; + return 1.0f; + return 1.0f - 0.25f*x*x; } } z = x*x; r = z*(R02+z*(R03+z*(R04+z*R05))); - s = one+z*(S01+z*(S02+z*(S03+z*S04))); + s = 1.0f+z*(S01+z*(S02+z*(S03+z*S04))); if(ix < 0x3F800000) { /* |x| < 1.00 */ - return one + z*(-0.25f + (r/s)); + return 1.0f + z*(-0.25f + (r/s)); } else { u = 0.5f*x; - return (one+u)*(one-u) + z*(r/s); + return (1.0f+u)*(1.0f-u) + z*(r/s); } } @@ -110,11 +107,11 @@ float y0f(float x) ix = 0x7fffffff & hx; /* Y0(NaN) is NaN, y0(-inf) is Nan, y0(inf) is 0 */ if (ix >= 0x7f800000) - return one/(x+x*x); + return 1.0f/(x+x*x); if (ix == 0) - return -one/zero; + return -1.0f/0.0f; if (hx < 0) - return zero/zero; + return 0.0f/0.0f; if (ix >= 0x40000000) { /* |x| >= 2.0 */ /* y0(x) = sqrt(2/(pi*x))*(p0(x)*sin(x0)+q0(x)*cos(x0)) * where x0 = x-pi/4 @@ -137,7 +134,7 @@ float y0f(float x) */ if (ix < 0x7f000000) { /* make sure x+x not overflow */ z = -cosf(x+x); - if (s*c < zero) + if (s*c < 0.0f) cc = z/ss; else ss = z/cc; @@ -156,7 +153,7 @@ float y0f(float x) } z = x*x; u = u00+z*(u01+z*(u02+z*(u03+z*(u04+z*(u05+z*u06))))); - v = one+z*(v01+z*(v02+z*(v03+z*v04))); + v = 1.0f+z*(v01+z*(v02+z*(v03+z*v04))); return u/v + tpi*(j0f(x)*logf(x)); } @@ -244,10 +241,10 @@ static float pzerof(float x) else if (ix >= 0x40f71c58){p = pR5; q = pS5;} else if (ix >= 0x4036db68){p = pR3; q = pS3;} else if (ix >= 0x40000000){p = pR2; q = pS2;} - z = one/(x*x); + z = 1.0f/(x*x); r = p[0]+z*(p[1]+z*(p[2]+z*(p[3]+z*(p[4]+z*p[5])))); - s = one+z*(q[0]+z*(q[1]+z*(q[2]+z*(q[3]+z*q[4])))); - return one + r/s; + s = 1.0f+z*(q[0]+z*(q[1]+z*(q[2]+z*(q[3]+z*q[4])))); + return 1.0f + r/s; } @@ -340,8 +337,8 @@ static float qzerof(float x) else if (ix >= 0x40f71c58){p = qR5; q = qS5;} else if (ix >= 0x4036db68){p = qR3; q = qS3;} else if (ix >= 0x40000000){p = qR2; q = qS2;} - z = one/(x*x); + z = 1.0f/(x*x); r = p[0]+z*(p[1]+z*(p[2]+z*(p[3]+z*(p[4]+z*p[5])))); - s = one+z*(q[0]+z*(q[1]+z*(q[2]+z*(q[3]+z*(q[4]+z*q[5]))))); + s = 1.0f+z*(q[0]+z*(q[1]+z*(q[2]+z*(q[3]+z*(q[4]+z*q[5]))))); return (-.125f + r/s)/x; } |