mirror of
https://sourceware.org/git/glibc.git
synced 2024-09-24 10:24:06 +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.
68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/* e_log10f.c -- float version of e_log10.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_log10f.c,v 1.5 1995/05/10 20:45:53 jtc Exp $";
|
|
#endif
|
|
|
|
#include "math.h"
|
|
#include "math_private.h"
|
|
|
|
#ifdef __STDC__
|
|
static const float
|
|
#else
|
|
static float
|
|
#endif
|
|
two25 = 3.3554432000e+07, /* 0x4c000000 */
|
|
ivln10 = 4.3429449201e-01, /* 0x3ede5bd9 */
|
|
log10_2hi = 3.0102920532e-01, /* 0x3e9a2080 */
|
|
log10_2lo = 7.9034151668e-07; /* 0x355427db */
|
|
|
|
#ifdef __STDC__
|
|
static const float zero = 0.0;
|
|
#else
|
|
static float zero = 0.0;
|
|
#endif
|
|
|
|
#ifdef __STDC__
|
|
float __ieee754_log10f(float x)
|
|
#else
|
|
float __ieee754_log10f(x)
|
|
float x;
|
|
#endif
|
|
{
|
|
float y,z;
|
|
int32_t i,k,hx;
|
|
|
|
GET_FLOAT_WORD(hx,x);
|
|
|
|
k=0;
|
|
if (hx < 0x00800000) { /* x < 2**-126 */
|
|
if ((hx&0x7fffffff)==0)
|
|
return -two25/zero; /* log(+-0)=-inf */
|
|
if (hx<0) return (x-x)/zero; /* log(-#) = NaN */
|
|
k -= 25; x *= two25; /* subnormal number, scale up x */
|
|
GET_FLOAT_WORD(hx,x);
|
|
}
|
|
if (hx >= 0x7f800000) return x+x;
|
|
k += (hx>>23)-127;
|
|
i = ((u_int32_t)k&0x80000000)>>31;
|
|
hx = (hx&0x007fffff)|((0x7f-i)<<23);
|
|
y = (float)(k+i);
|
|
SET_FLOAT_WORD(x,hx);
|
|
z = y*log10_2lo + ivln10*__ieee754_logf(x);
|
|
return z+y*log10_2hi;
|
|
}
|