diff options
Diffstat (limited to 'src/math/j1f.c')
| -rw-r--r-- | src/math/j1f.c | 33 |
1 files changed, 15 insertions, 18 deletions
diff --git a/src/math/j1f.c b/src/math/j1f.c index 2d617b67..de459e0d 100644 --- a/src/math/j1f.c +++ b/src/math/j1f.c @@ -19,7 +19,6 @@ static float ponef(float), qonef(float); static const float huge = 1e30, -one = 1.0, invsqrtpi = 5.6418961287e-01, /* 0x3f106ebb */ tpi = 6.3661974669e-01, /* 0x3f22f983 */ /* R0/S0 on [0,2] */ @@ -33,8 +32,6 @@ s03 = 1.1771846857e-06, /* 0x359dffc2 */ s04 = 5.0463624390e-09, /* 0x31ad6446 */ s05 = 1.2354227016e-11; /* 0x2d59567e */ -static const float zero = 0.0; - float j1f(float x) { float z,s,c,ss,cc,r,u,v,y; @@ -43,7 +40,7 @@ float j1f(float x) GET_FLOAT_WORD(hx, x); ix = hx & 0x7fffffff; if (ix >= 0x7f800000) - return one/x; + return 1.0f/x; y = fabsf(x); if (ix >= 0x40000000) { /* |x| >= 2.0 */ s = sinf(y); @@ -52,7 +49,7 @@ float j1f(float x) cc = s-c; if (ix < 0x7f000000) { /* make sure y+y not overflow */ z = cosf(y+y); - if (s*c > zero) + if (s*c > 0.0f) cc = z/ss; else ss = z/cc; @@ -74,12 +71,12 @@ float j1f(float x) } if (ix < 0x32000000) { /* |x| < 2**-27 */ /* raise inexact if x!=0 */ - if (huge+x > one) + if (huge+x > 1.0f) return 0.5f*x; } z = x*x; r = z*(r00+z*(r01+z*(r02+z*r03))); - s = one+z*(s01+z*(s02+z*(s03+z*(s04+z*s05)))); + s = 1.0f+z*(s01+z*(s02+z*(s03+z*(s04+z*s05)))); r *= x; return 0.5f*x + r/s; } @@ -108,11 +105,11 @@ float y1f(float x) ix = 0x7fffffff & hx; /* if Y1(NaN) is NaN, Y1(-inf) is NaN, Y1(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 */ s = sinf(x); c = cosf(x); @@ -120,7 +117,7 @@ float y1f(float x) cc = s-c; 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; @@ -149,8 +146,8 @@ float y1f(float x) return -tpi/x; z = x*x; u = U0[0]+z*(U0[1]+z*(U0[2]+z*(U0[3]+z*U0[4]))); - v = one+z*(V0[0]+z*(V0[1]+z*(V0[2]+z*(V0[3]+z*V0[4])))); - return x*(u/v) + tpi*(j1f(x)*logf(x)-one/x); + v = 1.0f+z*(V0[0]+z*(V0[1]+z*(V0[2]+z*(V0[3]+z*V0[4])))); + return x*(u/v) + tpi*(j1f(x)*logf(x)-1.0f/x); } /* For x >= 8, the asymptotic expansions of pone is @@ -239,10 +236,10 @@ static float ponef(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; } /* For x >= 8, the asymptotic expansions of qone is @@ -335,8 +332,8 @@ static float qonef(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 (.375f + r/s)/x; } |