mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
f7eac6eb50
* Makeconfig ($(common-objpfx)config.make): Depend on config.h.in. Mon Mar 4 17:35:09 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu> * hurd/catch-signal.c (hurd_safe_memmove): New function. (hurd_safe_copyin, hurd_safe_copyout): New functions. * hurd/hurd/sigpreempt.h: Declare them. Sun Mar 3 08:43:44 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu> Replace math code with fdlibm from Sun as modified for netbsd by JT Conklin and Ian Taylor, including x86 FPU support. * sysdeps/libm-ieee754, sysdeps/libm-i387: New directories. * math/math_private.h: New file. * sysdeps/i386/fpu/Implies: New file. * sysdeps/ieee754/Implies: New file. * math/machine/asm.h, math/machine/endian.h: New files. * math/Makefile, math/math.h: Rewritten. * mathcalls.h, math/mathcalls.h: New file, broken out of math.h. * math/finite.c: File removed. * sysdeps/generic/Makefile [$(subdir)=math]: Frobnication removed. * math/test-math.c: Include errno.h and string.h. * sysdeps/unix/bsd/dirstream.h: File removed. * sysdeps/unix/bsd/readdir.c: File removed.
95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/* @(#)w_jn.c 5.1 93/09/24 */
|
|
/*
|
|
* ====================================================
|
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
|
*
|
|
* Developed at SunPro, a Sun Microsystems, Inc. business.
|
|
* Permission to use, copy, modify, and distribute this
|
|
* software is freely granted, provided that this notice
|
|
* is preserved.
|
|
* ====================================================
|
|
*/
|
|
|
|
#if defined(LIBM_SCCS) && !defined(lint)
|
|
static char rcsid[] = "$NetBSD: w_jn.c,v 1.6 1995/05/10 20:49:19 jtc Exp $";
|
|
#endif
|
|
|
|
/*
|
|
* wrapper jn(int n, double x), yn(int n, double x)
|
|
* floating point Bessel's function of the 1st and 2nd kind
|
|
* of order n
|
|
*
|
|
* Special cases:
|
|
* y0(0)=y1(0)=yn(n,0) = -inf with division by zero signal;
|
|
* y0(-ve)=y1(-ve)=yn(n,-ve) are NaN with invalid signal.
|
|
* Note 2. About jn(n,x), yn(n,x)
|
|
* For n=0, j0(x) is called,
|
|
* for n=1, j1(x) is called,
|
|
* for n<x, forward recursion us used starting
|
|
* from values of j0(x) and j1(x).
|
|
* for n>x, a continued fraction approximation to
|
|
* j(n,x)/j(n-1,x) is evaluated and then backward
|
|
* recursion is used starting from a supposed value
|
|
* for j(n,x). The resulting value of j(0,x) is
|
|
* compared with the actual value to correct the
|
|
* supposed value of j(n,x).
|
|
*
|
|
* yn(n,x) is similar in all respects, except
|
|
* that forward recursion is used for all
|
|
* values of n>1.
|
|
*
|
|
*/
|
|
|
|
#include "math.h"
|
|
#include "math_private.h"
|
|
|
|
#ifdef __STDC__
|
|
double __jn(int n, double x) /* wrapper jn */
|
|
#else
|
|
double __jn(n,x) /* wrapper jn */
|
|
double x; int n;
|
|
#endif
|
|
{
|
|
#ifdef _IEEE_LIBM
|
|
return __ieee754_jn(n,x);
|
|
#else
|
|
double z;
|
|
z = __ieee754_jn(n,x);
|
|
if(_LIB_VERSION == _IEEE_ || __isnan(x) ) return z;
|
|
if(fabs(x)>X_TLOSS) {
|
|
return __kernel_standard((double)n,x,38); /* jn(|x|>X_TLOSS,n) */
|
|
} else
|
|
return z;
|
|
#endif
|
|
}
|
|
weak_alias (__jn, jn)
|
|
|
|
#ifdef __STDC__
|
|
double __yn(int n, double x) /* wrapper yn */
|
|
#else
|
|
double __yn(n,x) /* wrapper yn */
|
|
double x; int n;
|
|
#endif
|
|
{
|
|
#ifdef _IEEE_LIBM
|
|
return __ieee754_yn(n,x);
|
|
#else
|
|
double z;
|
|
z = __ieee754_yn(n,x);
|
|
if(_LIB_VERSION == _IEEE_ || __isnan(x) ) return z;
|
|
if(x <= 0.0){
|
|
if(x==0.0)
|
|
/* d= -one/(x-x); */
|
|
return __kernel_standard((double)n,x,12);
|
|
else
|
|
/* d = zero/(x-x); */
|
|
return __kernel_standard((double)n,x,13);
|
|
}
|
|
if(x>X_TLOSS) {
|
|
return __kernel_standard((double)n,x,39); /* yn(x>X_TLOSS,n) */
|
|
} else
|
|
return z;
|
|
#endif
|
|
}
|
|
weak_alias (__yn, yn)
|