nobu	2018-06-13 10:04:33 +0900 (Wed, 13 Jun 2018)

  New Revision: 63642

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63642

  Log:
    bignum.c: refine pow
    
    * bignum.c (rb_big_pow): make Complex and Rational instances from
      calculated results by API functions.

  Modified files:
    trunk/bignum.c
Index: bignum.c
===================================================================
--- bignum.c	(revision 63641)
+++ bignum.c	(revision 63642)
@@ -6209,8 +6209,10 @@ rb_big_pow(VALUE x, VALUE y) https://github.com/ruby/ruby/blob/trunk/bignum.c#L6209
     if (y == INT2FIX(0)) return INT2FIX(1);
     if (RB_FLOAT_TYPE_P(y)) {
 	d = RFLOAT_VALUE(y);
-	if ((BIGNUM_NEGATIVE_P(x) && !BIGZEROP(x)) && d != round(d))
-	    return rb_funcall(rb_complex_raw1(x), idPow, 1, y);
+	if ((BIGNUM_NEGATIVE_P(x) && !BIGZEROP(x)) && d != round(d)) {
+	    x = DBL2NUM(pow(-rb_big2dbl(x),  d));
+	    return rb_complex_polar(x, DBL2NUM(d * M_PI));
+	}
     }
     else if (RB_BIGNUM_TYPE_P(y)) {
 	y = bignorm(y);
@@ -6223,7 +6225,7 @@ rb_big_pow(VALUE x, VALUE y) https://github.com/ruby/ruby/blob/trunk/bignum.c#L6225
 	yy = FIX2LONG(y);
 
 	if (yy < 0)
-	    return rb_funcall(rb_rational_raw1(x), idPow, 1, y);
+	    return rb_rational_raw(INT2FIX(1), rb_big_pow(x, INT2NUM(-yy)));
 	else {
 	    VALUE z = 0;
 	    SIGNED_VALUE mask;

--
ML: ruby-changes@q...
Info: http://www.atdot.net/~ko1/quickml/