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author | zimmerma <zimmerma@280ebfd0-de03-0410-8827-d642c229c3f4> | 2004-02-17 10:01:18 +0000 |
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committer | zimmerma <zimmerma@280ebfd0-de03-0410-8827-d642c229c3f4> | 2004-02-17 10:01:18 +0000 |
commit | a670e9bc4c691d692b4c967758d1caa130d043ff (patch) | |
tree | daecee53078162f4aa745c70bb827a9f893de215 | |
parent | e851c47cb20c0689d834b82ca7431b49cac5e62c (diff) | |
download | mpfr-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.c | 12 |
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; } |