mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-21 10:20:06 +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.
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/* e_acoshf.c -- float version of e_acosh.c.
|
|
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
|
|
*/
|
|
|
|
/*
|
|
* ====================================================
|
|
* 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: e_acoshf.c,v 1.5 1995/05/12 04:57:20 jtc Exp $";
|
|
#endif
|
|
|
|
#include "math.h"
|
|
#include "math_private.h"
|
|
|
|
#ifdef __STDC__
|
|
static const float
|
|
#else
|
|
static float
|
|
#endif
|
|
one = 1.0,
|
|
ln2 = 6.9314718246e-01; /* 0x3f317218 */
|
|
|
|
#ifdef __STDC__
|
|
float __ieee754_acoshf(float x)
|
|
#else
|
|
float __ieee754_acoshf(x)
|
|
float x;
|
|
#endif
|
|
{
|
|
float t;
|
|
int32_t hx;
|
|
GET_FLOAT_WORD(hx,x);
|
|
if(hx<0x3f800000) { /* x < 1 */
|
|
return (x-x)/(x-x);
|
|
} else if(hx >=0x4d800000) { /* x > 2**28 */
|
|
if(hx >=0x7f800000) { /* x is inf of NaN */
|
|
return x+x;
|
|
} else
|
|
return __ieee754_logf(x)+ln2; /* acosh(huge)=log(2x) */
|
|
} else if (hx==0x3f800000) {
|
|
return 0.0; /* acosh(1) = 0 */
|
|
} else if (hx > 0x40000000) { /* 2**28 > x > 2 */
|
|
t=x*x;
|
|
return __ieee754_logf((float)2.0*x-one/(x+__ieee754_sqrtf(t-one)));
|
|
} else { /* 1<x<2 */
|
|
t = x-one;
|
|
return __log1pf(t+__sqrtf((float)2.0*t+t*t));
|
|
}
|
|
}
|