[src/exp_2.c] Improved t = 0 test.

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@9236 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 2 insertions, 4 deletions

diff --git a/src/exp_2.c b/src/exp_2.c
index dcfc3a8d0..d71f3ad55 100644
--- a/src/exp_2.c
+++ b/src/exp_2.c
@@ -298,8 +298,6 @@ mpfr_exp2_aux (mpz_t s, mpfr_srcptr r, mpfr_prec_t q, mpfr_exp_t *exps)
       /* truncates the bits of t which are < ulp(s) = 2^(1-q) */
       expt += mpz_normalize (t, t, (mpfr_exp_t) q - dif);
       /* error at most 2^(1-q) */
-      if (mpz_sgn (t) == 0)
-        break;
       if (l > 1)
         {
           /* GMP doesn't optimize the case of power of 2 */
@@ -314,9 +312,9 @@ mpfr_exp2_aux (mpz_t s, mpfr_srcptr r, mpfr_prec_t q, mpfr_exp_t *exps)
             }
           /* the error wrt t^l/l! is here at most 3*l*ulp(s) */
           MPFR_ASSERTD (expt == *exps);
-          if (mpz_sgn (t) == 0)
-            break;
         }
+      if (mpz_sgn (t) == 0)
+        break;
       mpz_add (s, s, t);                        /* no error here: exact */
       /* ensures rr has the same size as t: after several shifts, the error
          on rr is still at most ulp(t)=ulp(s) */