float j1f(float x) /* wrapper j1f */ { #ifdef _IEEE_LIBM return __ieee754_j1f(x); #else float z; z = __ieee754_j1f(x); if(_LIB_VERSION == _IEEE_ || isnanf(x) ) return z; if(fabsf(x)>(float)X_TLOSS) { /* j1(|x|>X_TLOSS) */ return (float)__kernel_standard((double)x,(double)x,136); } else return z; #endif }
/* wrapper j1f */ float j1f (float x) { if (__builtin_expect (fabsf (x) > X_TLOSS, 0) && _LIB_VERSION != _IEEE_) /* j1(|x|>X_TLOSS) */ return __kernel_standard_f (x, x, 136); return __ieee754_j1f (x); }
/* wrapper j1f */ float __j1f (float x) { if (__builtin_expect (isgreater (fabsf (x), X_TLOSS), 0) && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_) /* j1(|x|>X_TLOSS) */ return __kernel_standard_f (x, x, 136); return __ieee754_j1f (x); }
float __ieee754_y1f(float x) { float z, s,c,ss,cc,u,v; int32_t hx,ix; GET_FLOAT_WORD(hx,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); if(ix==0) return -one/zero; if(hx<0) return zero/zero; if(ix >= 0x40000000) { /* |x| >= 2.0 */ s = sinf(x); c = cosf(x); ss = -s-c; cc = s-c; if(ix<0x7f000000) { /* make sure x+x not overflow */ z = cosf(x+x); if ((s*c)>zero) cc = z/ss; else ss = z/cc; } /* y1(x) = sqrt(2/(pi*x))*(p1(x)*sin(x0)+q1(x)*cos(x0)) * where x0 = x-3pi/4 * Better formula: * cos(x0) = cos(x)cos(3pi/4)+sin(x)sin(3pi/4) * = 1/sqrt(2) * (sin(x) - cos(x)) * sin(x0) = sin(x)cos(3pi/4)-cos(x)sin(3pi/4) * = -1/sqrt(2) * (cos(x) + sin(x)) * To avoid cancellation, use * sin(x) +- cos(x) = -cos(2x)/(sin(x) -+ cos(x)) * to compute the worse one. */ if(ix>0x48000000) z = (invsqrtpi*ss)/sqrtf(x); else { u = ponef(x); v = qonef(x); z = invsqrtpi*(u*ss+v*cc)/sqrtf(x); } return z; } if(ix<=0x24800000) { /* x < 2**-54 */ 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*(__ieee754_j1f(x)*__ieee754_logf(x)-one/x)); }