added item on rounding to odd

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@2983 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 7 insertions, 0 deletions

diff --git a/TODO b/TODO
index 091646525..224f96a90 100644
--- a/TODO
+++ b/TODO
@@ -120,6 +120,13 @@ Miscellaneous:
 	add one ulp to the mantissa.
 - add a new rounding mode: round to nearest, with ties away from zero
   (will be in 754r, could be used by mpfr_round)
+- add a new roundind mode: round to odd. If the result is not exactly
+	representable, then round to the odd mantissa. This rounding
+	has the nice property that for k > 1, if:
+	y = round(x, p+k, TO_ODD)
+        z = round(y, p, TO_NEAREST_EVEN), then
+        z = round(x, p, TO_NEAREST_EVEN)
+  so it avoids the double-rounding problem.
 
 - check/define the sign of infinity for gamma(-integer)