numeric.c: Fix Integer#pow with a large Fixnum modulo

* numeric.c: Fix Integer#pow with a large Fixnum modulo
  [Bug #14259] [ruby-core:84562]

* test/ruby/test_numeric.rb: add assertions for reproducing this bug.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61517 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 1 deletions

diff --git a/bignum.c b/bignum.c
index 148276743f..7ffb798e5e 100644
--- a/bignum.c
+++ b/bignum.c
@@ -7016,7 +7016,9 @@ int_pow_tmp2(VALUE x, VALUE y, long mm, int nega_flg)
         xx = MUL_MODULO(xx, xx, m);
     }
 
-#ifndef DLONG
+#ifdef DLONG
+    tmp = tmp2;
+#else
     tmp = FIX2LONG(tmp2);
 #endif
     if (nega_flg && tmp) {