pow.c: added FIXME comment.

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@4939 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 4 insertions, 0 deletions

diff --git a/pow.c b/pow.c
index 862430aa4..d98c8155f 100644
--- a/pow.c
+++ b/pow.c
@@ -437,6 +437,10 @@ mpfr_pow (mpfr_ptr z, mpfr_srcptr x, mpfr_srcptr y, mp_rnd_t rnd_mode)
   }
 
   /* General case */
+  /* FIXME: handle the case where x is negative (which implies that y is
+     a very large integer). One needs to take the absolute value of x and
+     update the error analysis because one can have Nt < PREC(x). The sign
+     of the result is obtained from MPFR_IS_NEG (x) && is_odd (y). */
   {
     /* Declaration of the intermediary variable */
     mpfr_t t, u, k;