https://git.ruby-lang.org/ruby.git/commit/?id=34019a22eb

From 34019a22eb41206e3d5d1ac29b3874275aa7f71c Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 16 Jul 2019 07:58:47 +0900
Subject: Expanded f_denominator


diff --git a/complex.c b/complex.c
index bcdc486..74d91b0 100644
--- a/complex.c
+++ b/complex.c
@@ -191,7 +191,17 @@ f_arg(VALUE x) https://github.com/ruby/ruby/blob/trunk/complex.c#L191
     return rb_funcall(x, id_arg, 0);
 }
 
-fun1(denominator)
+inline static VALUE
+f_denominator(VALUE x)
+{
+    if (RB_TYPE_P(x, T_RATIONAL)) {
+        return RRATIONAL(x)->den;
+    }
+    if (RB_FLOAT_TYPE_P(x)) {
+        return rb_float_denominator(x);
+    }
+    return INT2FIX(1);
+}
 
 inline static VALUE
 f_negate(VALUE x)
@@ -1252,7 +1262,7 @@ nucomp_numerator(VALUE self) https://github.com/ruby/ruby/blob/trunk/complex.c#L1262
 
     get_dat1(self);
 
-    cd = f_denominator(self);
+    cd = nucomp_denominator(self);
     return f_complex_new2(CLASS_OF(self),
 			  f_mul(f_numerator(dat->real),
 				f_div(cd, f_denominator(dat->real))),
diff --git a/internal.h b/internal.h
index fb184e2..bd82231 100644
--- a/internal.h
+++ b/internal.h
@@ -2029,6 +2029,7 @@ VALUE rb_rational_abs(VALUE self); https://github.com/ruby/ruby/blob/trunk/internal.h#L2029
 VALUE rb_rational_cmp(VALUE self, VALUE other);
 VALUE rb_rational_pow(VALUE self, VALUE other);
 VALUE rb_numeric_quo(VALUE x, VALUE y);
+VALUE rb_float_denominator(VALUE x);
 
 /* re.c */
 VALUE rb_reg_compile(VALUE str, int options, const char *sourcefile, int sourceline);
diff --git a/rational.c b/rational.c
index e137ac2..7607628 100644
--- a/rational.c
+++ b/rational.c
@@ -2080,8 +2080,8 @@ float_numerator(VALUE self) https://github.com/ruby/ruby/blob/trunk/rational.c#L2080
  *
  * See also Float#numerator.
  */
-static VALUE
-float_denominator(VALUE self)
+VALUE
+rb_float_denominator(VALUE self)
 {
     double d = RFLOAT_VALUE(self);
     VALUE r;
@@ -2778,7 +2778,7 @@ Init_Rational(void) https://github.com/ruby/ruby/blob/trunk/rational.c#L2778
     rb_define_method(rb_cInteger, "denominator", integer_denominator, 0);
 
     rb_define_method(rb_cFloat, "numerator", float_numerator, 0);
-    rb_define_method(rb_cFloat, "denominator", float_denominator, 0);
+    rb_define_method(rb_cFloat, "denominator", rb_float_denominator, 0);
 
     rb_define_method(rb_cNilClass, "to_r", nilclass_to_r, 0);
     rb_define_method(rb_cNilClass, "rationalize", nilclass_rationalize, -1);
-- 
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