Correction de bug (pas msb normalise).

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@46 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 7 insertions, 4 deletions

diff --git a/random.c b/random.c
index e9738429f..b63b1e00e 100644
--- a/random.c
+++ b/random.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include "gmp.h"
 #include "gmp-impl.h"
+#include "longlong.h"
 #include "mpfr.h"
 
 /* Computes a random mpfr in [0, 1[ with precision PREC */
@@ -8,22 +9,24 @@
 void
 mpfr_random(mpfr_ptr x)
 {
-  mp_limb_t *xp; unsigned long xs, i; 
+  mp_limb_t *xp; unsigned long xs, i, cnt; 
 
-  EXP(x) = 0; 
   xp = MANT(x); 
   xs = ABSSIZE(x); 
 
   for (i = 0; i < xs; i++)
     {
-      /* random() could be replaced by a homemade random number generator.
+      /* random() c/sh/ould be replaced by a homemade random number generator.
 	 Indeed, if on Linux random is a good RNG, this is definitely not
 	 the case in most Un*xes. */
       xp[i] = random();
     }
   
+  count_leading_zeros(cnt, xp[xs - 1]); 
+  if (cnt) mpn_lshift(xp, xp, xs, cnt); 
+  EXP(x) = -cnt; 
   mpfr_round_raw(xp, xp, random()&3, SIZE(x), PREC(x)); 
-  /* Since the value 1 is forbidden, ignore any possible carry. */
+  /* ignore any possible carry (this is sheer laziness). */
 }
 
 void