nobu	2018-06-17 10:07:27 +0900 (Sun, 17 Jun 2018)

  New Revision: 63676

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63676

  Log:
    refine Integer#**
    
    * numeric.c (fix_pow): calculate the denominator, exponent of
      self.

  Modified files:
    trunk/numeric.c
Index: numeric.c
===================================================================
--- numeric.c	(revision 63675)
+++ numeric.c	(revision 63676)
@@ -3974,8 +3974,10 @@ fix_pow(VALUE x, VALUE y) https://github.com/ruby/ruby/blob/trunk/numeric.c#L3974
 	    else
 		return INT2FIX(-1);
 	}
-	if (b < 0)
-	    return num_funcall1(rb_rational_raw1(x), idPow, y);
+	if (b < 0) {
+	    if (a == 0) rb_num_zerodiv();
+	    return rb_rational_raw(INT2FIX(1), rb_int_pow(x, LONG2NUM(-b)));
+	}
 
 	if (b == 0) return INT2FIX(1);
 	if (b == 1) return x;
@@ -3991,8 +3993,10 @@ fix_pow(VALUE x, VALUE y) https://github.com/ruby/ruby/blob/trunk/numeric.c#L3993
 	    if (int_even_p(y)) return INT2FIX(1);
 	    else return INT2FIX(-1);
 	}
-	if (rb_num_negative_int_p(y))
-	    return num_funcall1(rb_rational_raw1(x), idPow, y);
+	if (BIGNUM_NEGATIVE_P(y)) {
+	    if (a == 0) rb_num_zerodiv();
+	    return rb_rational_raw(INT2FIX(1), rb_int_pow(x, rb_big_uminus(y)));
+	}
 	if (a == 0) return INT2FIX(0);
 	x = rb_int2big(FIX2LONG(x));
 	return rb_big_pow(x, y);

--
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