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authorzimmerma <zimmerma@280ebfd0-de03-0410-8827-d642c229c3f4>2004-02-17 10:01:18 +0000
committerzimmerma <zimmerma@280ebfd0-de03-0410-8827-d642c229c3f4>2004-02-17 10:01:18 +0000
commita670e9bc4c691d692b4c967758d1caa130d043ff (patch)
treedaecee53078162f4aa745c70bb827a9f893de215
parente851c47cb20c0689d834b82ca7431b49cac5e62c (diff)
downloadmpfr-a670e9bc4c691d692b4c967758d1caa130d043ff.tar.gz
added comment about return value
git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@2742 280ebfd0-de03-0410-8827-d642c229c3f4
-rw-r--r--round_raw_generic.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/round_raw_generic.c b/round_raw_generic.c
index a93f4d364..e348826c1 100644
--- a/round_raw_generic.c
+++ b/round_raw_generic.c
@@ -33,7 +33,9 @@ MA 02111-1307, USA. */
* If flag = 0, puts in y the value of xp (with precision xprec and
* sign 1 if negative=0, -1 otherwise) rounded to precision yprec and
* direction rnd_mode. Supposes x is not zero nor NaN nor +/- Infinity
- * (i.e. *xp != 0).
+ * (i.e. *xp != 0). In that case, the return value is a possible carry
+ * (0 or 1) that may happen during the rounding, in which case the result
+ * is a power of two.
*
* If inexp != NULL, computes the inexact flag of the rounding.
* (In case of even rounding when rnd = GMP_RNDN, puts 2 or -2 in *inexp.)
@@ -163,10 +165,10 @@ mpfr_round_raw_generic(mp_limb_t *yp, mp_limb_t *xp, mp_prec_t xprec,
rnd_RNDN_sb_return:
if (flag)
return 1; /*sb != 0 && rnd_mode != GMP_RNDZ;*/
- carry = mpn_add_1(yp, xp + xsize - nw, nw,
- rw ?
- MP_LIMB_T_ONE << (BITS_PER_MP_LIMB - rw)
- : 1);
+ carry = mpn_add_1 (yp, xp + xsize - nw, nw,
+ rw ?
+ MP_LIMB_T_ONE << (BITS_PER_MP_LIMB - rw)
+ : 1);
yp[0] &= himask;
return carry;
}