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Date:      Sun, 5 Jun 2011 16:02:37 +0200
From:      Oliver Pinter <oliver.pntr@gmail.com>
To:        David Schultz <das@freebsd.org>
Cc:        ports@freebsd.org, svn-src-stable@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, svn-src-stable-8@freebsd.org
Subject:   Re: svn commit: r219323 - in stable/8/lib/msun: . man src
Message-ID:  <BANLkTinX_DA-v%2B-1XLhb3K9yncOtFX5O-w@mail.gmail.com>
In-Reply-To: <201103060849.p268nitH091290@svn.freebsd.org>
References:  <201103060849.p268nitH091290@svn.freebsd.org>

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On 3/6/11, David Schultz <das@freebsd.org> wrote:
> Author: das
> Date: Sun Mar  6 08:49:44 2011
> New Revision: 219323
> URL: http://svn.freebsd.org/changeset/base/219323
>
> Log:
>   MFC
>     r216210: refactor log(3)
>     r216211: add log2(3) and log2f(3)
>
> Added:
>   stable/8/lib/msun/src/e_log2.c
>      - copied unchanged from r216211, head/lib/msun/src/e_log2.c
>   stable/8/lib/msun/src/e_log2f.c
>      - copied unchanged from r216211, head/lib/msun/src/e_log2f.c
>   stable/8/lib/msun/src/k_log.h
>      - copied unchanged from r216210, head/lib/msun/src/k_log.h
>   stable/8/lib/msun/src/k_logf.h
>      - copied unchanged from r216210, head/lib/msun/src/k_logf.h
> Modified:
>   stable/8/lib/msun/Makefile
>   stable/8/lib/msun/Symbol.map
>   stable/8/lib/msun/man/log.3
>   stable/8/lib/msun/man/math.3
>   stable/8/lib/msun/src/math.h
>   stable/8/lib/msun/src/math_private.h
> Directory Properties:
>   stable/8/lib/msun/   (props changed)
>
> Modified: stable/8/lib/msun/Makefile
> ==============================================================================
> --- stable/8/lib/msun/Makefile	Sun Mar  6 08:35:50 2011	(r219322)
> +++ stable/8/lib/msun/Makefile	Sun Mar  6 08:49:44 2011	(r219323)
> @@ -45,7 +45,8 @@ COMMON_SRCS= b_exp.c b_log.c b_tgamma.c
>  	e_expf.c e_fmod.c e_fmodf.c e_gamma.c e_gamma_r.c e_gammaf.c \
>  	e_gammaf_r.c e_hypot.c e_hypotf.c e_j0.c e_j0f.c e_j1.c e_j1f.c \
>  	e_jn.c e_jnf.c e_lgamma.c e_lgamma_r.c e_lgammaf.c e_lgammaf_r.c \
> -	e_log.c e_log10.c e_log10f.c e_logf.c e_pow.c e_powf.c e_rem_pio2.c \
> +	e_log.c e_log10.c e_log10f.c e_log2.c e_log2f.c e_logf.c \
> +	e_pow.c e_powf.c e_rem_pio2.c \
>  	e_rem_pio2f.c e_remainder.c e_remainderf.c e_scalb.c e_scalbf.c \
>  	e_sinh.c e_sinhf.c e_sqrt.c e_sqrtf.c fenv.c \
>  	k_cos.c k_cosf.c k_rem_pio2.c k_sin.c k_sinf.c \
> @@ -164,7 +165,7 @@ MLINKS+=j0.3 j1.3 j0.3 jn.3 j0.3 y0.3 j0
>  MLINKS+=j0.3 j0f.3 j0.3 j1f.3 j0.3 jnf.3 j0.3 y0f.3 j0.3 ynf.3
>  MLINKS+=lgamma.3 gamma.3 lgamma.3 gammaf.3 lgamma.3 lgammaf.3 \
>  	lgamma.3 tgamma.3 lgamma.3 tgammaf.3
> -MLINKS+=log.3 log10.3 log.3 log10f.3 log.3 log1p.3 log.3 log1pf.3 log.3
> logf.3
> +MLINKS+=log.3 log10.3 log.3 log10f.3 log.3 log1p.3 log.3 log1pf.3 log.3
> logf.3 log.3 log2.3 log.3 log2f.3
>  MLINKS+=lrint.3 llrint.3 lrint.3 llrintf.3 lrint.3 llrintl.3 \
>  	lrint.3 lrintf.3 lrint.3 lrintl.3
>  MLINKS+=lround.3 llround.3 lround.3 llroundf.3 lround.3 llroundl.3 \
>
> Modified: stable/8/lib/msun/Symbol.map
> ==============================================================================
> --- stable/8/lib/msun/Symbol.map	Sun Mar  6 08:35:50 2011	(r219322)
> +++ stable/8/lib/msun/Symbol.map	Sun Mar  6 08:49:44 2011	(r219323)
> @@ -218,3 +218,10 @@ FBSD_1.1 {
>  	cprojf;
>  	cprojl;
>  };
> +
> +/* First added in 9.0-CURRENT */
> +FBSD_1.2 {
> +	__isnanf;
> +	log2;
> +	log2f;
> +};
>
> Modified: stable/8/lib/msun/man/log.3
> ==============================================================================
> --- stable/8/lib/msun/man/log.3	Sun Mar  6 08:35:50 2011	(r219322)
> +++ stable/8/lib/msun/man/log.3	Sun Mar  6 08:49:44 2011	(r219323)
> @@ -1,4 +1,4 @@
> -.\" Copyright (c) 2008 David Schultz <das@FreeBSD.org>
> +.\" Copyright (c) 2008-2010 David Schultz <das@FreeBSD.org>
>  .\" All rights reserved.
>  .\"
>  .\" Redistribution and use in source and binary forms, with or without
> @@ -24,7 +24,7 @@
>  .\"
>  .\" $FreeBSD$
>  .\"
> -.Dd January 17, 2008
> +.Dd December 5, 2010
>  .Dt LOG 3
>  .Os
>  .Sh NAME
> @@ -33,6 +33,8 @@
>  .Nm logl ,
>  .Nm log10 ,
>  .Nm log10f ,
> +.Nm log2 ,
> +.Nm log2f ,
>  .Nm log1p ,
>  .Nm log1pf
>  .Nd logarithm functions
> @@ -49,6 +51,10 @@
>  .Ft float
>  .Fn log10f "float x"
>  .Ft double
> +.Fn log2 "double x"
> +.Ft float
> +.Fn log2f "float x"
> +.Ft double
>  .Fn log1p "double x"
>  .Ft float
>  .Fn log1pf "float x"
> @@ -65,6 +71,12 @@ The
>  and
>  .Fn log10f
>  functions compute the logarithm base 10 of
> +.Fa x ,
> +while
> +.Fn log2
> +and
> +.Fn log2f
> +compute the logarithm base 2 of
>  .Fa x .
>  .Pp
>  The
> @@ -97,6 +109,8 @@ The
>  .Fn logf ,
>  .Fn log10 ,
>  .Fn log10f ,
> +.Fn log2 ,
> +.Fn log2f ,
>  .Fn log1p ,
>  and
>  .Fn log1pf
>
> Modified: stable/8/lib/msun/man/math.3
> ==============================================================================
> --- stable/8/lib/msun/man/math.3	Sun Mar  6 08:35:50 2011	(r219322)
> +++ stable/8/lib/msun/man/math.3	Sun Mar  6 08:49:44 2011	(r219323)
> @@ -28,7 +28,7 @@
>  .\"	from: @(#)math.3	6.10 (Berkeley) 5/6/91
>  .\" $FreeBSD$
>  .\"
> -.Dd December 16, 2007
> +.Dd December 5, 2010
>  .Dt MATH 3
>  .Os
>  .if n \{\
> @@ -185,7 +185,7 @@ lgamma	log gamma function
>  log	natural logarithm
>  log10	logarithm to base 10
>  log1p	log(1+x)
> -.\" log2	base 2 logarithm
> +log2	base 2 logarithm
>  pow	exponential x**y
>  sin	trigonometric function
>  sinh	hyperbolic function
> @@ -197,7 +197,7 @@ y1	Bessel function of the second kind of
>  yn	Bessel function of the second kind of the order n
>  .El
>  .Pp
> -Unlike the algebraic functions listed earlier, the routines
> +The routines
>  in this section may not produce a result that is correctly rounded,
>  so reproducible results cannot be guaranteed across platforms.
>  For most of these functions, however, incorrect rounding occurs
> @@ -224,18 +224,20 @@ and
>  values, were written for or imported into subsequent versions of FreeBSD.
>  .Sh BUGS
>  The
> -.Fn log2
> -function is missing, and many functions are not available in their
> +.Fn cbrt
> +function and many of the transcendental functions
> +are not available in their
>  .Vt "long double"
>  variants.
>  .Pp
>  Many of the routines to compute transcendental functions produce
>  inaccurate results in other than the default rounding mode.
>  .Pp
> -On some architectures, trigonometric argument reduction is not
> -performed accurately, resulting in errors greater than 1
> +On the i386 platform, trigonometric argument reduction is not
> +performed accurately for very large arguments, resulting in errors
> +greater than 1
>  .Em ulp
> -for large arguments to
> +for such arguments to
>  .Fn cos ,
>  .Fn sin ,
>  and
>
> Copied: stable/8/lib/msun/src/e_log2.c (from r216211,
> head/lib/msun/src/e_log2.c)
> ==============================================================================
> --- /dev/null	00:00:00 1970	(empty, because file is newly added)
> +++ stable/8/lib/msun/src/e_log2.c	Sun Mar  6 08:49:44 2011	(r219323, copy
> of r216211, head/lib/msun/src/e_log2.c)
> @@ -0,0 +1,60 @@
> +
> +/* @(#)e_log10.c 1.3 95/01/18 */
> +/*
> + * ====================================================
> + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
> + *
> + * Developed at SunSoft, a Sun Microsystems, Inc. business.
> + * Permission to use, copy, modify, and distribute this
> + * software is freely granted, provided that this notice
> + * is preserved.
> + * ====================================================
> + */
> +
> +#include <sys/cdefs.h>
> +__FBSDID("$FreeBSD$");
> +
> +/* log2(x)
> + * Return the base 2 logarithm of x.
> + */
> +
> +#include "math.h"
> +#include "math_private.h"
> +#include "k_log.h"
> +
> +static const double
> +two54      =  1.80143985094819840000e+16, /* 0x43500000, 0x00000000 */
> +ivln2hi    =  0x1.71547652000p+0,
> +ivln2lo    =  0x1.705fc2eefa2p-33;
> +
> +static const double zero   =  0.0;
> +
> +double
> +__ieee754_log2(double x)
> +{
> +	double f,hi,lo;
> +	int32_t i,k,hx;
> +	u_int32_t lx;
> +
> +	EXTRACT_WORDS(hx,lx,x);
> +
> +        k=0;
> +        if (hx < 0x00100000) {                  /* x < 2**-1022  */
> +            if (((hx&0x7fffffff)|lx)==0)
> +                return -two54/zero;             /* log(+-0)=-inf */
> +            if (hx<0) return (x-x)/zero;        /* log(-#) = NaN */
> +            k -= 54; x *= two54; /* subnormal number, scale up x */
> +	    GET_HIGH_WORD(hx,x);
> +        }
> +	if (hx >= 0x7ff00000) return x+x;
> +	k += (hx>>20)-1023;
> +	hx &= 0x000fffff;
> +	i = (hx+0x95f64)&0x100000;
> +	SET_HIGH_WORD(x,hx|(i^0x3ff00000));	/* normalize x or x/2 */
> +	k += (i>>20);
> +	f = __kernel_log(x);
> +	hi = x = x - 1;
> +	SET_LOW_WORD(hi,0);
> +	lo = x - hi;
> +	return (x+f)*ivln2lo + (lo+f)*ivln2hi + hi*ivln2hi + k;
> +}
>
> Copied: stable/8/lib/msun/src/e_log2f.c (from r216211,
> head/lib/msun/src/e_log2f.c)
> ==============================================================================
> --- /dev/null	00:00:00 1970	(empty, because file is newly added)
> +++ stable/8/lib/msun/src/e_log2f.c	Sun Mar  6 08:49:44 2011	(r219323, copy
> of r216211, head/lib/msun/src/e_log2f.c)
> @@ -0,0 +1,54 @@
> +/*
> + * ====================================================
> + * 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 <sys/cdefs.h>
> +__FBSDID("$FreeBSD$");
> +
> +#include "math.h"
> +#include "math_private.h"
> +#include "k_logf.h"
> +
> +static const float
> +two25      =  3.3554432000e+07, /* 0x4c000000 */
> +ivln2hi    =  0x1.716p+0f,
> +ivln2lo    = -0x1.7135a8fa03d11p-13;
> +
> +static const float zero   =  0.0;
> +
> +float
> +__ieee754_log2f(float x)
> +{
> +	float f,hi,lo;
> +	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;
> +	hx &= 0x007fffff;
> +	i = (hx+(0x4afb0d))&0x800000;
> +	SET_FLOAT_WORD(x,hx|(i^0x3f800000));	/* normalize x or x/2 */
> +	k += (i>>23);
> +	f = __kernel_logf(x);
> +	x = x - 1;
> +	GET_FLOAT_WORD(hx,x);
> +	SET_FLOAT_WORD(hi,hx&0xfffff000);
> +	lo = x - hi;
> +	return (x+f)*ivln2lo + (lo+f)*ivln2hi + hi*ivln2hi + k;
> +}
>
> Copied: stable/8/lib/msun/src/k_log.h (from r216210,
> head/lib/msun/src/k_log.h)
> ==============================================================================
> --- /dev/null	00:00:00 1970	(empty, because file is newly added)
> +++ stable/8/lib/msun/src/k_log.h	Sun Mar  6 08:49:44 2011	(r219323, copy of
> r216210, head/lib/msun/src/k_log.h)
> @@ -0,0 +1,116 @@
> +
> +/* @(#)e_log.c 1.3 95/01/18 */
> +/*
> + * ====================================================
> + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
> + *
> + * Developed at SunSoft, a Sun Microsystems, Inc. business.
> + * Permission to use, copy, modify, and distribute this
> + * software is freely granted, provided that this notice
> + * is preserved.
> + * ====================================================
> + */
> +
> +#include <sys/cdefs.h>
> +__FBSDID("$FreeBSD$");
> +
> +/* __kernel_log(x)
> + * Return log(x) - (x-1) for x in ~[sqrt(2)/2, sqrt(2)].
> + *
> + * The following describes the overall strategy for computing
> + * logarithms in base e.  The argument reduction and adding the final
> + * term of the polynomial are done by the caller for increased accuracy
> + * when different bases are used.
> + *
> + * Method :
> + *   1. Argument Reduction: find k and f such that
> + *			x = 2^k * (1+f),
> + *	   where  sqrt(2)/2 < 1+f < sqrt(2) .
> + *
> + *   2. Approximation of log(1+f).
> + *	Let s = f/(2+f) ; based on log(1+f) = log(1+s) - log(1-s)
> + *		 = 2s + 2/3 s**3 + 2/5 s**5 + .....,
> + *	     	 = 2s + s*R
> + *      We use a special Reme algorithm on [0,0.1716] to generate
> + * 	a polynomial of degree 14 to approximate R The maximum error
> + *	of this polynomial approximation is bounded by 2**-58.45. In
> + *	other words,
> + *		        2      4      6      8      10      12      14
> + *	    R(z) ~ Lg1*s +Lg2*s +Lg3*s +Lg4*s +Lg5*s  +Lg6*s  +Lg7*s
> + *  	(the values of Lg1 to Lg7 are listed in the program)
> + *	and
> + *	    |      2          14          |     -58.45
> + *	    | Lg1*s +...+Lg7*s    -  R(z) | <= 2
> + *	    |                             |
> + *	Note that 2s = f - s*f = f - hfsq + s*hfsq, where hfsq = f*f/2.
> + *	In order to guarantee error in log below 1ulp, we compute log
> + *	by
> + *		log(1+f) = f - s*(f - R)	(if f is not too large)
> + *		log(1+f) = f - (hfsq - s*(hfsq+R)).	(better accuracy)
> + *	
> + *	3. Finally,  log(x) = k*ln2 + log(1+f).
> + *			    = k*ln2_hi+(f-(hfsq-(s*(hfsq+R)+k*ln2_lo)))
> + *	   Here ln2 is split into two floating point number:
> + *			ln2_hi + ln2_lo,
> + *	   where n*ln2_hi is always exact for |n| < 2000.
> + *
> + * Special cases:
> + *	log(x) is NaN with signal if x < 0 (including -INF) ;
> + *	log(+INF) is +INF; log(0) is -INF with signal;
> + *	log(NaN) is that NaN with no signal.
> + *
> + * Accuracy:
> + *	according to an error analysis, the error is always less than
> + *	1 ulp (unit in the last place).
> + *
> + * Constants:
> + * The hexadecimal values are the intended ones for the following
> + * constants. The decimal values may be used, provided that the
> + * compiler will convert from decimal to binary accurately enough
> + * to produce the hexadecimal values shown.
> + */
> +
> +static const double
> +Lg1 = 6.666666666666735130e-01,  /* 3FE55555 55555593 */
> +Lg2 = 3.999999999940941908e-01,  /* 3FD99999 9997FA04 */
> +Lg3 = 2.857142874366239149e-01,  /* 3FD24924 94229359 */
> +Lg4 = 2.222219843214978396e-01,  /* 3FCC71C5 1D8E78AF */
> +Lg5 = 1.818357216161805012e-01,  /* 3FC74664 96CB03DE */
> +Lg6 = 1.531383769920937332e-01,  /* 3FC39A09 D078C69F */
> +Lg7 = 1.479819860511658591e-01;  /* 3FC2F112 DF3E5244 */
> +
> +/*
> + * We always inline __kernel_log(), since doing so produces a
> + * substantial performance improvement (~40% on amd64).
> + */
> +static inline double
> +__kernel_log(double x)
> +{
> +	double hfsq,f,s,z,R,w,t1,t2;
> +	int32_t hx,i,j;
> +	u_int32_t lx;
> +
> +	EXTRACT_WORDS(hx,lx,x);
> +
> +	f = x-1.0;
> +	if((0x000fffff&(2+hx))<3) {	/* -2**-20 <= f < 2**-20 */
> +	    if(f==0.0) return 0.0;
> +	    return f*f*(0.33333333333333333*f-0.5);
> +	}
> + 	s = f/(2.0+f);
> +	z = s*s;
> +	hx &= 0x000fffff;
> +	i = hx-0x6147a;
> +	w = z*z;
> +	j = 0x6b851-hx;
> +	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=0.5*f*f;
> +	    return s*(hfsq+R) - hfsq;
> +	} else {
> +	    return s*(R-f);
> +	}
> +}
>
> Copied: stable/8/lib/msun/src/k_logf.h (from r216210,
> head/lib/msun/src/k_logf.h)
> ==============================================================================
> --- /dev/null	00:00:00 1970	(empty, because file is newly added)
> +++ stable/8/lib/msun/src/k_logf.h	Sun Mar  6 08:49:44 2011	(r219323, copy
> of r216210, head/lib/msun/src/k_logf.h)
> @@ -0,0 +1,55 @@
> +/*
> + * ====================================================
> + * 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 <sys/cdefs.h>
> +__FBSDID("$FreeBSD$");
> +
> +/* __kernel_logf(x)
> + * Return log(x) - (x-1) for x in ~[sqrt(2)/2, sqrt(2)].
> + */
> +
> +static const float
> +/* |(log(1+s)-log(1-s))/s - Lg(s)| < 2**-34.24 (~[-4.95e-11, 4.97e-11]). */
> +Lg1 =      0xaaaaaa.0p-24,	/* 0.66666662693 */
> +Lg2 =      0xccce13.0p-25,	/* 0.40000972152 */
> +Lg3 =      0x91e9ee.0p-25,	/* 0.28498786688 */
> +Lg4 =      0xf89e26.0p-26;	/* 0.24279078841 */
> +
> +static inline float
> +__kernel_logf(float x)
> +{
> +	float hfsq,f,s,z,R,w,t1,t2;
> +	int32_t ix,i,j;
> +
> +	GET_FLOAT_WORD(ix,x);
> +
> +	f = x-(float)1.0;
> +	if((0x007fffff&(0x8000+ix))<0xc000) {	/* -2**-9 <= f < 2**-9 */
> +	    if(f==0.0) return 0.0;
> +	    return f*f*((float)0.33333333333333333*f-(float)0.5);
> +	}
> + 	s = f/((float)2.0+f);
> +	z = s*s;
> +	ix &= 0x007fffff;
> +	i = ix-(0x6147a<<3);
> +	w = z*z;
> +	j = (0x6b851<<3)-ix;
> +	t1= w*(Lg2+w*Lg4);
> +	t2= z*(Lg1+w*Lg3);
> +	i |= j;
> +	R = t2+t1;
> +	if(i>0) {
> +	    hfsq=(float)0.5*f*f;
> +	    return s*(hfsq+R) - hfsq;
> +	} else {
> +	    return s*(R-f);
> +	}
> +}
>
> Modified: stable/8/lib/msun/src/math.h
> ==============================================================================
> --- stable/8/lib/msun/src/math.h	Sun Mar  6 08:35:50 2011	(r219322)
> +++ stable/8/lib/msun/src/math.h	Sun Mar  6 08:49:44 2011	(r219323)
> @@ -235,6 +235,7 @@ double	lgamma(double);
>  long long llrint(double);
>  long long llround(double);
>  double	log1p(double);
> +double	log2(double);
>  double	logb(double);
>  long	lrint(double);
>  long	lround(double);
> @@ -318,6 +319,7 @@ int	ilogbf(float) __pure2;
>  float	ldexpf(float, int);
>  float	log10f(float);
>  float	log1pf(float);
> +float	log2f(float);
>  float	logf(float);
>  float	modff(float, float *);	/* fundamentally !__pure2 */
>
>
> Modified: stable/8/lib/msun/src/math_private.h
> ==============================================================================
> --- stable/8/lib/msun/src/math_private.h	Sun Mar  6 08:35:50 2011	(r219322)
> +++ stable/8/lib/msun/src/math_private.h	Sun Mar  6 08:49:44 2011	(r219323)
> @@ -292,6 +292,7 @@ irint(double x)
>  #define	__ieee754_acos	acos
>  #define	__ieee754_acosh	acosh
>  #define	__ieee754_log	log
> +#define	__ieee754_log2	log2
>  #define	__ieee754_atanh	atanh
>  #define	__ieee754_asin	asin
>  #define	__ieee754_atan2	atan2
> @@ -330,6 +331,7 @@ irint(double x)
>  #define	__ieee754_lgammaf_r lgammaf_r
>  #define	__ieee754_gammaf_r gammaf_r
>  #define	__ieee754_log10f log10f
> +#define	__ieee754_log2f log2f
>  #define	__ieee754_sinhf	sinhf
>  #define	__ieee754_hypotf hypotf
>  #define	__ieee754_j0f	j0f
> _______________________________________________
> svn-src-stable@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/svn-src-stable
> To unsubscribe, send any mail to "svn-src-stable-unsubscribe@freebsd.org"
>

Hi all!

Please MFC this commit to 7-STABLE, or apply the attached patch to graphviz...
http://www.freebsd.org/cgi/query-pr.cgi?pr=157217&cat=

op@pandora-d src> sysctl kern.osreldate
kern.osreldate: 704101
op@pandora-d src> find . -iname "*log*"
./e_log.c
./e_log10.c
./e_log10f.c
./e_logf.c
./s_ilogb.c
./s_ilogbf.c
./s_ilogbl.c
./s_log1p.c
./s_log1pf.c
./s_logb.c
./s_logbf.c

thanks,
Oliver

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