glibc/sysdeps/libm-ieee754/s_log2f.c
Ulrich Drepper d111572f2f Update.
1998-02-26  Ulrich Drepper  <drepper@cygnus.com>

	* nis/ypclnt.c (yp_master): Check result of strdup.
	Patch by Thorsten Kukuk.

1998-02-26  Thorsten Kukuk  <kukuk@vt.uni-paderborn.de>

	* nis/ypclnt.c: Give clnt handle after error checking free, change
	return codes to fix problems with rpc.nisd in YP mode on Ultra's.

1998-02-26 09:00  Ulrich Drepper  <drepper@cygnus.com>

	* misc/fstab.c: Partly rewritten to use dynamically allocated buffer.
	Patch by Joe Keane <jgk@jgk.org>.

	* misc/fstab.h (struct fstab): Change fs_type member to be const.
	* misc/fstab.c: Remove casts in fs_type assignments.

1998-02-26  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* sysdeps/i386/fpu/bits/fenv.h: Correct typo.  ISO C 9X defines
	FE_TOWARDZERO and not FE_TOWARDSZERO.  Reported by H.J. Lu.
	* sysdeps/sparc/sparc64/fpu/bits/fenv.h: Likewise.
	* sysdeps/sparc/sparc32/fpu/bits/fenv.h: Likewise.
	* sysdeps/powerpc/bits/fenv.h: Likewise.
	* sysdeps/m68k/fpu/bits/fenv.h: Likewise.
	* sysdeps/generic/bits/fenv.h: Likewise.
	* sysdeps/alpha/fpu/bits/fenv.h: Likewise.
	* sysdeps/i386/fpu/fesetenv.c (fesetenv): Likewise.
	* sysdeps/powerpc/test-arith.c (main): Likewise.

1998-02-25  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/i386/fpu/bits/mathinline.h: Also fix i386 versions of
	the comparison macros.

1998-02-21 20:14  H.J. Lu  <hjl@gnu.org>

	* sysdeps/libm-ieee754/s_log2.c (ln2): Added.
	(__log2): Fixed return values.
	* sysdeps/libm-ieee754/s_log2f.c: Likewise.

1998-02-25  Ulrich Drepper  <drepper@cygnus.com>

	* math/math.h (isunordered): Rename local variables to ensure
	correct code.  Reported by HJ Lu.

1998-02-25 10:34  Ulrich Drepper  <drepper@cygnus.com>

	* sysdpes/i386/fpu/bits/mathinline.h (isgreater, isgreaterequal,
	isless, islessequal, islessgreater, isunordered): Fix syntax for
	fucompip instruction.
	(isless, islessequal): Fix logic.

1998-02-21  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* math/libm-test.c (sqrt_test): Add test for sqrt(2).
	(comparisons_test): New tests for comparison macros.
1998-02-26 11:20:59 +00:00

92 lines
2.2 KiB
C

/* e_logf.c -- float version of e_log.c.
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
* adapted for log2 by Ulrich Drepper <drepper@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.
* ====================================================
*/
#include "math.h"
#include "math_private.h"
#ifdef __STDC__
static const float
#else
static float
#endif
ln2 = 0.69314718055994530942,
two25 = 3.355443200e+07, /* 0x4c000000 */
Lg1 = 6.6666668653e-01, /* 3F2AAAAB */
Lg2 = 4.0000000596e-01, /* 3ECCCCCD */
Lg3 = 2.8571429849e-01, /* 3E924925 */
Lg4 = 2.2222198546e-01, /* 3E638E29 */
Lg5 = 1.8183572590e-01, /* 3E3A3325 */
Lg6 = 1.5313838422e-01, /* 3E1CD04F */
Lg7 = 1.4798198640e-01; /* 3E178897 */
#ifdef __STDC__
static const float zero = 0.0;
#else
static float zero = 0.0;
#endif
#ifdef __STDC__
float __log2f(float x)
#else
float __log2f(x)
float x;
#endif
{
float hfsq,f,s,z,R,w,t1,t2,dk;
int32_t k,ix,i,j;
GET_FLOAT_WORD(ix,x);
k=0;
if (ix < 0x00800000) { /* x < 2**-126 */
if ((ix&0x7fffffff)==0)
return -two25/(x-x); /* log(+-0)=-inf */
if (ix<0) return (x-x)/(x-x); /* log(-#) = NaN */
k -= 25; x *= two25; /* subnormal number, scale up x */
GET_FLOAT_WORD(ix,x);
}
if (ix >= 0x7f800000) return x+x;
k += (ix>>23)-127;
ix &= 0x007fffff;
i = (ix+(0x95f64<<3))&0x800000;
SET_FLOAT_WORD(x,ix|(i^0x3f800000)); /* normalize x or x/2 */
k += (i>>23);
dk = (float)k;
f = x-(float)1.0;
if((0x007fffff&(15+ix))<16) { /* |f| < 2**-20 */
if(f==zero) return dk;
R = f*f*((float)0.5-(float)0.33333333333333333*f);
return dk-(R-f)/ln2;
}
s = f/((float)2.0+f);
z = s*s;
i = ix-(0x6147a<<3);
w = z*z;
j = (0x6b851<<3)-ix;
t1= w*(Lg2+w*(Lg4+w*Lg6));
t2= z*(Lg1+w*(Lg3+w*(Lg5+w*Lg7)));
i |= j;
R = t2+t1;
if(i>0) {
hfsq=(float)0.5*f*f;
return dk-((hfsq-(s*(hfsq+R)))-f)/ln2;
} else {
return dk-((s*(f-R))-f)/ln2;
}
}
weak_alias (__log2f, log2f)