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- the log() and log10() functions always returned -inf() even if the arguments

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was within the valid range for a log() function. Using DBL_EPSILON as the
  threshold was not correct as EPSILON is 2.2204460492503131E-16 whereas
  values like 1E-200 are still valid double values for a log().


git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@15175 87f5fb63-7c3d-0410-a384-fd976d0f7a62
This commit is contained in:
Jens Maus
2007-11-08 11:23:53 +00:00
parent 0f3791a9a4
commit 5ea68e3265
3 changed files with 9 additions and 4 deletions
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5
library/changes
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@ -1,3 +1,8 @@
- the log() and log10() functions always returned -inf() even if the arguments
was within the valid range for a log() function. Using DBL_EPSILON as the
threshold was not correct as EPSILON is 2.2204460492503131E-16 whereas
values like 1E-200 are still valid double values for a log().
c.lib 1.202 (16.1.2007)
- Added llrint() function contributed by Henning Nielsen Lund. Thank you

4
library/math_log.c
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@ -1,5 +1,5 @@
/*
* $Id: math_log.c,v 1.9 2006-01-08 12:04:23 obarthel Exp $
* $Id: math_log.c,v 1.10 2007-11-08 11:23:53 damato Exp $
*
* :ts=4
*
@ -244,7 +244,7 @@ log(double x)
{
double result;
if(x > DBL_EPSILON)
if(x > 0)
{
result = __log(x);
}

4
library/math_log10.c
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@ -1,5 +1,5 @@
/*
* $Id: math_log10.c,v 1.8 2006-01-08 12:04:23 obarthel Exp $
* $Id: math_log10.c,v 1.9 2007-11-08 11:23:53 damato Exp $
*
* :ts=4
*
@ -186,7 +186,7 @@ log10(double x)
{
double result;
if(x > DBL_EPSILON)
if(x > 0)
{
result = __log10(x);
}