* complex.c (nucomp_expt): convert to a float when the given power

is a bignum.

	* rational.c (nurat_expt): ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@23883 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,10 @@
+Sun Jun 28 22:25:07 2009  Tadayoshi Funaba  <tadf@dotrb.org>
+
+	* complex.c (nucomp_expt): convert to a float when the given power
+	  is a bignum.
+
+	* rational.c (nurat_expt): ditto.
+
 Sun Jun 28 21:16:48 2009  Tadayoshi Funaba  <tadf@dotrb.org>
 
 	* lib/cmath.rb (sqrt): fixed an issue [ruby-list:45852].

complex.c

@@ -226,6 +226,18 @@ k_integer_p(VALUE x)
     return f_kind_of_p(x, rb_cInteger);
 }
 
+inline static VALUE
+k_fixnum_p(VALUE x)
+{
+    return f_kind_of_p(x, rb_cFixnum);
+}
+
+inline static VALUE
+k_bignum_p(VALUE x)
+{
+    return f_kind_of_p(x, rb_cBignum);
+}
+
 inline static VALUE
 k_float_p(VALUE x)
 {
@@ -831,7 +843,7 @@ nucomp_expt(VALUE self, VALUE other)
 		       f_mul(dat->imag, m_log_bang(r)));
 	return f_complex_polar(CLASS_OF(self), nr, ntheta);
     }
-    if (k_integer_p(other)) {
+    if (k_fixnum_p(other)) {
 	if (f_gt_p(other, ZERO)) {
 	    VALUE x, z, n;
 
@@ -862,9 +874,12 @@ nucomp_expt(VALUE self, VALUE other)
     if (k_numeric_p(other) && f_real_p(other)) {
 	VALUE r, theta;
 
+	if (k_bignum_p(other))
+	    rb_warn("in a**b, b may be too big");
+
 	r = f_abs(self);
 	theta = f_arg(self);
-	return f_complex_polar(CLASS_OF(self), f_expt(r, other),
+	return f_complex_polar(CLASS_OF(self), rb_fexpt(r, other),
 			       f_mul(theta, other));
     }
     return rb_num_coerce_bin(self, other, id_expt);

rational.c

@@ -902,7 +902,6 @@ nurat_expt(VALUE self, VALUE other)
 
     switch (TYPE(other)) {
       case T_FIXNUM:
-      case T_BIGNUM:
 	{
 	    VALUE num, den;
 
@@ -924,6 +923,8 @@ nurat_expt(VALUE self, VALUE other)
 	    }
 	    return f_rational_new2(CLASS_OF(self), num, den);
 	}
+      case T_BIGNUM:
+	rb_warn("in a**b, b may be too big");
       case T_FLOAT:
       case T_RATIONAL:
 	return rb_fexpt(f_to_f(self), other);