diff options
Diffstat (limited to 'lib/msun/src/e_log10.c')
| -rw-r--r-- | lib/msun/src/e_log10.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/lib/msun/src/e_log10.c b/lib/msun/src/e_log10.c index 69a2356..4f4ed28 100644 --- a/lib/msun/src/e_log10.c +++ b/lib/msun/src/e_log10.c @@ -5,37 +5,37 @@ * * Developed at SunPro, a Sun Microsystems, Inc. business. * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice + * software is freely granted, provided that this notice * is preserved. * ==================================================== */ #ifndef lint -static char rcsid[] = "$Id: e_log10.c,v 1.1.1.1 1994/08/19 09:39:44 jkh Exp $"; +static char rcsid[] = "$Id: e_log10.c,v 1.2 1995/04/07 23:23:23 bde Exp $"; #endif /* __ieee754_log10(x) * Return the base 10 logarithm of x - * + * * Method : * Let log10_2hi = leading 40 bits of log10(2) and * log10_2lo = log10(2) - log10_2hi, * ivln10 = 1/log(10) rounded. * Then - * n = ilogb(x), + * n = ilogb(x), * if(n<0) n = n+1; * x = scalbn(x,-n); * log10(x) := n*log10_2hi + (n*log10_2lo + ivln10*log(x)) * * Note 1: - * To guarantee log10(10**n)=n, where 10**n is normal, the rounding + * To guarantee log10(10**n)=n, where 10**n is normal, the rounding * mode must set to Round-to-Nearest. * Note 2: * [1/log(10)] rounded to 53 bits has error .198 ulps; * log10 is monotonic at all binary break points. * * Special cases: - * log10(x) is NaN with signal if x < 0; + * log10(x) is NaN with signal if x < 0; * log10(+INF) is +INF with no signal; log10(0) is -INF with signal; * log10(NaN) is that NaN with no signal; * log10(10**N) = N for N=0,1,...,22. |
