BUGS: possible incorrect results due to internal underflow.

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@5123 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 6 insertions, 0 deletions

diff --git a/BUGS b/BUGS
index aeda41ba4..8864dcd8c 100644
--- a/BUGS
+++ b/BUGS
@@ -39,6 +39,12 @@ Known bugs:
 
 Potential bugs:
 
+* Possible incorrect results due to internal underflow, which can lead to
+  a huge loss of accuracy while the error analysis doesn't take that into
+  account. If the underflow occurs at the last function call (just before
+  the MPFR_CAN_ROUND), the result should be correct (or MPFR gets into an
+  infinite loop). TODO: check the code and the error analysis.
+
 * Possible integer overflows on some machines.
 
 * Possible bugs with huge precisions (> 2^30).