The current implementation of mpfr_erfc cannot compute the result for

large inputs. Return NaN with the erange flag set instead of aborting.
Documented this behavior in mpfr.texi.


git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@4172 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 3 insertions, 0 deletions

diff --git a/mpfr.texi b/mpfr.texi
index 5253c1544..bdfe77be9 100644
--- a/mpfr.texi
+++ b/mpfr.texi
@@ -1405,6 +1405,9 @@ rounded in the direction @var{rnd}.
 @deftypefun int mpfr_erfc (mpfr_t @var{rop}, mpfr_t @var{op}, mp_rnd_t @var{rnd})
 Set @var{rop} to the value of the complementary error function on @var{op},
 rounded in the direction @var{rnd}.
+Note: the current implementation cannot compute the result for large inputs;
+in this case, NaN is returned and the erange flag is set to indicate that
+the input is in an unsupported domain.
 @end deftypefun
 
 @deftypefun int mpfr_fma (mpfr_t @var{rop}, mpfr_t @var{op1}, mpfr_t @var{op2}, mpfr_t @var{op3}, mp_rnd_t @var{rnd})