akr	2013-06-29 22:33:40 +0900 (Sat, 29 Jun 2013)

  New Revision: 41694

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=41694

  Log:
    * bignum.c (bary_2comp): Simplified.

  Modified files:
    trunk/ChangeLog
    trunk/bignum.c

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 41693)
+++ ChangeLog	(revision 41694)
@@ -1,3 +1,7 @@ https://github.com/ruby/ruby/blob/trunk/ChangeLog#L1
+Sat Jun 29 22:31:59 2013  Tanaka Akira  <akr@f...>
+
+	* bignum.c (bary_2comp): Simplified.
+
 Sat Jun 29 09:33:53 2013  Tanaka Akira  <akr@f...>
 
 	* bignum.c (bigor_int): Return -1 if y == -1.
Index: bignum.c
===================================================================
--- bignum.c	(revision 41693)
+++ bignum.c	(revision 41694)
@@ -271,16 +271,15 @@ static int https://github.com/ruby/ruby/blob/trunk/bignum.c#L271
 bary_2comp(BDIGIT *ds, size_t n)
 {
     size_t i = n;
-    BDIGIT_DBL num;
     if (!n) return 1;
     while (i--) ds[i] = BIGLO(~ds[i]);
-    i = 0; num = 1;
-    do {
-	num += ds[i];
-	ds[i++] = BIGLO(num);
-	num = BIGDN(num);
-    } while (i < n);
-    return num != 0;
+    i = 0;
+    for (i = 0; i < n; i++) {
+	ds[i] = BIGLO(ds[i]+1);
+        if (ds[i] != 0)
+            return 0;
+    }
+    return 1;
 }
 
 /* modify a bignum by 2's complement */

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