unified is_power_of_two() and mpfr_powerof2_raw()

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@10756 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 7 insertions, 6 deletions

diff --git a/src/powerof2.c b/src/powerof2.c
index f10ace0ad..53f0551cd 100644
--- a/src/powerof2.c
+++ b/src/powerof2.c
@@ -31,16 +31,17 @@ http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
 int
 mpfr_powerof2_raw (mpfr_srcptr x)
 {
-  mp_limb_t *xp;
-  mp_size_t xn;
-
   /* This is an internal function, and we may call it with some
      wrong numbers (ie good mantissa but wrong flags or exp)
      So we don't want to test if it is a pure FP.
      MPFR_ASSERTN(MPFR_IS_PURE_FP(x)); */
-  xp = MPFR_MANT(x);
-  xn = (MPFR_PREC(x) - 1) / GMP_NUMB_BITS;
-  if (xp[xn] != MPFR_LIMB_HIGHBIT)
+  return mpfr_powerof2_raw2 (MPFR_MANT(x), MPFR_LIMB_SIZE(x));
+}
+
+int
+mpfr_powerof2_raw2 (const mp_limb_t *xp, mp_size_t xn)
+{
+  if (xp[--xn] != MPFR_LIMB_HIGHBIT)
     return 0;
   while (xn > 0)
     if (xp[--xn] != 0)