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.
85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/* s_cbrtf.c -- float version of s_cbrt.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: s_cbrtf.c,v 1.4 1995/05/10 20:46:51 jtc Exp $";
|
|
#endif
|
|
|
|
#include "math.h"
|
|
#include "math_private.h"
|
|
|
|
/* cbrtf(x)
|
|
* Return cube root of x
|
|
*/
|
|
#ifdef __STDC__
|
|
static const unsigned
|
|
#else
|
|
static unsigned
|
|
#endif
|
|
B1 = 709958130, /* B1 = (84+2/3-0.03306235651)*2**23 */
|
|
B2 = 642849266; /* B2 = (76+2/3-0.03306235651)*2**23 */
|
|
|
|
#ifdef __STDC__
|
|
static const float
|
|
#else
|
|
static float
|
|
#endif
|
|
C = 5.4285717010e-01, /* 19/35 = 0x3f0af8b0 */
|
|
D = -7.0530611277e-01, /* -864/1225 = 0xbf348ef1 */
|
|
E = 1.4142856598e+00, /* 99/70 = 0x3fb50750 */
|
|
F = 1.6071428061e+00, /* 45/28 = 0x3fcdb6db */
|
|
G = 3.5714286566e-01; /* 5/14 = 0x3eb6db6e */
|
|
|
|
#ifdef __STDC__
|
|
float __cbrtf(float x)
|
|
#else
|
|
float __cbrtf(x)
|
|
float x;
|
|
#endif
|
|
{
|
|
float r,s,t;
|
|
int32_t hx;
|
|
u_int32_t sign;
|
|
u_int32_t high;
|
|
|
|
GET_FLOAT_WORD(hx,x);
|
|
sign=hx&0x80000000; /* sign= sign(x) */
|
|
hx ^=sign;
|
|
if(hx>=0x7f800000) return(x+x); /* cbrt(NaN,INF) is itself */
|
|
if(hx==0)
|
|
return(x); /* cbrt(0) is itself */
|
|
|
|
SET_FLOAT_WORD(x,hx); /* x <- |x| */
|
|
/* rough cbrt to 5 bits */
|
|
if(hx<0x00800000) /* subnormal number */
|
|
{SET_FLOAT_WORD(t,0x4b800000); /* set t= 2**24 */
|
|
t*=x; GET_FLOAT_WORD(high,t); SET_FLOAT_WORD(t,high/3+B2);
|
|
}
|
|
else
|
|
SET_FLOAT_WORD(t,hx/3+B1);
|
|
|
|
|
|
/* new cbrt to 23 bits */
|
|
r=t*t/x;
|
|
s=C+r*t;
|
|
t*=G+F/(s+E+D/s);
|
|
|
|
/* retore the sign bit */
|
|
GET_FLOAT_WORD(high,t);
|
|
SET_FLOAT_WORD(t,high|sign);
|
|
return(t);
|
|
}
|
|
weak_alias (__cbrtf, cbrtf)
|