nobu	2018-10-03 03:03:43 +0900 (Wed, 03 Oct 2018)

  New Revision: 64899

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=64899

  Log:
    Get rid of calling to_f in rat2dbl_without_to_f
    
    [Bug #15189]

  Modified files:
    trunk/object.c
Index: object.c
===================================================================
--- object.c	(revision 64898)
+++ object.c	(revision 64899)
@@ -3421,17 +3421,16 @@ rb_str_to_dbl(VALUE str, int badcheck) https://github.com/ruby/ruby/blob/trunk/object.c#L3421
 #define big2dbl_without_to_f(x) rb_big2dbl(x)
 #define int2dbl_without_to_f(x) \
     (FIXNUM_P(x) ? fix2dbl_without_to_f(x) : big2dbl_without_to_f(x))
+#define num2dbl_without_to_f(x) \
+    (FIXNUM_P(x) ? fix2dbl_without_to_f(x) : \
+     RB_TYPE_P(x, T_BIGNUM) ? big2dbl_without_to_f(x) : \
+     (Check_Type(x, T_FLOAT), RFLOAT_VALUE(x)))
 static inline double
 rat2dbl_without_to_f(VALUE x)
 {
     VALUE num = rb_rational_num(x);
     VALUE den = rb_rational_den(x);
-    if (RB_INTEGER_TYPE_P(num) && RB_INTEGER_TYPE_P(den)) {
-        return int2dbl_without_to_f(num) / int2dbl_without_to_f(den);
-    }
-    else {
-        return NUM2DBL(num) / NUM2DBL(den);
-    }
+    return num2dbl_without_to_f(num) / num2dbl_without_to_f(den);
 }
 
 #define special_const_to_float(val, pre, post) \

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