replaced mpfr_can_round (approx, err, rnd1, GMP_RNDN, prec)

by       mpfr_can_round (approx, err, rnd1, GMP_RNDZ, prec + 1)
which in addition guarantees a correct inexact flag


git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@2492 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 2 insertions, 1 deletions

diff --git a/acos.c b/acos.c
index 1210f2c49..093734b65 100644
--- a/acos.c
+++ b/acos.c
@@ -108,7 +108,8 @@ mpfr_acos (mpfr_ptr acos, mpfr_srcptr x, mp_rnd_t rnd_mode)
       mpfr_div_2ui (tmp, tmp, 1, GMP_RNDN);
       mpfr_sub (arcc, tmp, arcc, GMP_RNDN);
 
-      if (mpfr_can_round (arcc, realprec, GMP_RNDN, rnd_mode, MPFR_PREC(acos)))
+      if (mpfr_can_round (arcc, realprec, GMP_RNDN, GMP_RNDZ,
+                          MPFR_PREC(acos) + (rnd_mode == GMP_RNDN)))
         {
           inexact = mpfr_set (acos, arcc, rnd_mode);
           good = 1;