added comment about last change

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@4299 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 3 insertions, 0 deletions

diff --git a/set_uj.c b/set_uj.c
index 87989fe55..24730802c 100644
--- a/set_uj.c
+++ b/set_uj.c
@@ -77,6 +77,9 @@ mpfr_set_uj_2exp (mpfr_t x, uintmax_t j, intmax_t e, mp_rnd_t rnd)
     limb = yp[0] = j;
   else
     {
+      /* Note: either BITS_PER_MP_LIMB = uintmax_bit_size, then k = 1 the
+         shift j >>= bpml is never done, or BITS_PER_MP_LIMB < uintmax_bit_size
+         and bpml = BITS_PER_MP_LIMB. */
       for (i = 0; i < k; i++, j >>= bpml)
         yp[i] = j; /* Only the low bits are copied */