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| author | Andoni Arregi <andoni.arregui@gtd-gmbh.de> | 2022-02-11 12:16:00 +0100 |
|---|---|---|
| committer | Corinna Vinschen <corinna@vinschen.de> | 2022-02-14 14:44:11 +0100 |
| commit | ec69debcb977d6395f9e91ee20133de473484e20 (patch) | |
| tree | 6ece15967669d02dabff3edee6819349c8fb4d25 /newlib/libm | |
| parent | dd653423157b49ebe0c07f692cf8ba483b76e8b7 (diff) | |
| download | newlib-ec69debcb977d6395f9e91ee20133de473484e20.zip newlib-ec69debcb977d6395f9e91ee20133de473484e20.tar.gz newlib-ec69debcb977d6395f9e91ee20133de473484e20.tar.bz2 | |
Improve lgammaf range for very small cases
The original cut for small arguments at |x|<2**-70 (copied from the
double version) produces that when computing nadj we get a subnormal
number for t*x and thus, the division of pi/subnormal will be INF and
the logarithm of it too, which is wrong as a result for lgammaf in this
range.
The proposed new limit seems to be safe and has been tested to
produce accurate results.
(Courtesy of Andreas Jung, ESA)
Diffstat (limited to 'newlib/libm')
| -rw-r--r-- | newlib/libm/math/erf_lgamma.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/newlib/libm/math/erf_lgamma.c b/newlib/libm/math/erf_lgamma.c index f88f630..84d0215 100644 --- a/newlib/libm/math/erf_lgamma.c +++ b/newlib/libm/math/erf_lgamma.c @@ -168,7 +168,7 @@ static float zero= 0.0000000000e+00; *signgamp = -1; return one/(x-x); } - if(ix<0x1c800000) { /* |x|<2**-70, return -log(|x|) */ + if(ix<0x30800000) { /* |x|<2**-30, return -log(|x|) */ if(hx<0) { *signgamp = -1; return -__ieee754_logf(-x); |