div64 fix (aka ssh bug)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1570 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 3 insertions, 2 deletions

diff --git a/target-i386/helper.c b/target-i386/helper.c
index c7fea9553e..e2f6fba2ef 100644
--- a/target-i386/helper.c
+++ b/target-i386/helper.c
@@ -3261,7 +3261,7 @@ static void imul64(uint64_t *plow, uint64_t *phigh, int64_t a, int64_t b)
 static int div64(uint64_t *plow, uint64_t *phigh, uint64_t b)
 {
     uint64_t q, r, a1, a0;
-    int i, qb;
+    int i, qb, ab;
 
     a0 = *plow;
     a1 = *phigh;
@@ -3275,8 +3275,9 @@ static int div64(uint64_t *plow, uint64_t *phigh, uint64_t b)
             return 1;
         /* XXX: use a better algorithm */
         for(i = 0; i < 64; i++) {
+            ab = a1 >> 63;
             a1 = (a1 << 1) | (a0 >> 63);
-            if (a1 >= b) {
+            if (ab || a1 >= b) {
                 a1 -= b;
                 qb = 1;
             } else {