shyouhei	2018-11-16 12:09:00 +0900 (Fri, 16 Nov 2018)

  New Revision: 65754

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=65754

  Log:
    bignum.c: avoid (size_t)--

  Modified files:
    trunk/bignum.c
Index: bignum.c
===================================================================
--- bignum.c	(revision 65753)
+++ bignum.c	(revision 65754)
@@ -385,6 +385,7 @@ bdigitdbl2bary(BDIGIT *ds, size_t n, BDI https://github.com/ruby/ruby/blob/trunk/bignum.c#L385
 static int
 bary_cmp(const BDIGIT *xds, size_t xn, const BDIGIT *yds, size_t yn)
 {
+    size_t i;
     BARY_TRUNC(xds, xn);
     BARY_TRUNC(yds, yn);
 
@@ -393,11 +394,12 @@ bary_cmp(const BDIGIT *xds, size_t xn, c https://github.com/ruby/ruby/blob/trunk/bignum.c#L394
     if (xn > yn)
         return 1;
 
-    while (xn-- && xds[xn] == yds[xn])
-        ;
-    if (xn == (size_t)-1)
+    for (i = 0; i < xn; i++)
+        if (xds[xn - i - 1] != yds[yn - i - 1])
+            break;
+    if (i == xn)
         return 0;
-    return xds[xn] < yds[xn] ? -1 : 1;
+    return xds[xn - i - 1] < yds[yn - i - 1] ? -1 : 1;
 }
 
 static BDIGIT
@@ -5152,6 +5154,9 @@ rb_big2long(VALUE x) https://github.com/ruby/ruby/blob/trunk/bignum.c#L5154
 static unsigned LONG_LONG
 big2ull(VALUE x, const char *type)
 {
+#if SIZEOF_LONG_LONG > SIZEOF_BDIGIT
+    size_t i;
+#endif
     size_t len = BIGNUM_LEN(x);
     unsigned LONG_LONG num;
     BDIGIT *ds = BDIGITS(x);
@@ -5164,9 +5169,9 @@ big2ull(VALUE x, const char *type) https://github.com/ruby/ruby/blob/trunk/bignum.c#L5169
     num = (unsigned LONG_LONG)ds[0];
 #else
     num = 0;
-    while (len--) {
+    for (i = 0; i < len; i++) {
 	num = BIGUP(num);
-	num += ds[len];
+        num += ds[len - i - 1];
     }
 #endif
     return num;

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