https://git.ruby-lang.org/ruby.git/commit/?id=fb18a8113a

From fb18a8113a549185938e3cf12b3494547d077558 Mon Sep 17 00:00:00 2001
From: Kenta Murata <mrkn@m...>
Date: Sat, 9 Jan 2021 15:10:20 +0900
Subject: [ruby/bigdecimal] Stop using GetVpValueWithPrec in
 rb_float_convert_to_BigDecimal

https://github.com/ruby/bigdecimal/commit/33e7c50263
https://github.com/ruby/bigdecimal/commit/d3c1b0b921

diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index 72c7b34..5194615 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -199,6 +199,7 @@ cannot_be_coerced_into_BigDecimal(VALUE exc_class, VALUE v) https://github.com/ruby/ruby/blob/trunk/ext/bigdecimal/bigdecimal.c#L199
 }
 
 static inline VALUE BigDecimal_div2(VALUE, VALUE, VALUE);
+static VALUE rb_float_convert_to_BigDecimal(VALUE val, size_t digs, int raise_exception);
 
 static Real*
 GetVpValueWithPrec(VALUE v, long prec, int must)
@@ -208,27 +209,14 @@ GetVpValueWithPrec(VALUE v, long prec, int must) https://github.com/ruby/ruby/blob/trunk/ext/bigdecimal/bigdecimal.c#L209
     VALUE num, bg;
     char szD[128];
     VALUE orig = Qundef;
-    double d;
 
 again:
     switch(TYPE(v)) {
-      case T_FLOAT:
-	if (prec < 0) goto unable_to_coerce_without_prec;
-	if (prec > (long)DBLE_FIG) goto SomeOneMayDoIt;
-	d = RFLOAT_VALUE(v);
-	if (!isfinite(d)) {
-            pv = VpCreateRbObject(1, NULL, true);
-	    VpDtoV(pv, d);
-	    return pv;
-	}
-	if (d != 0.0) {
-	    v = rb_funcall(v, id_to_r, 0);
-	    goto again;
-	}
-	if (1/d < 0.0) {
-            return VpCreateRbObject(prec, "-0", true);
-	}
-        return VpCreateRbObject(prec, "0", true);
+      case T_FLOAT: {
+        VALUE obj = rb_float_convert_to_BigDecimal(v, prec, must);
+        TypedData_Get_Struct(obj, Real, &BigDecimal_data_type, pv);
+        return pv;
+      }
 
       case T_RATIONAL:
 	if (prec < 0) goto unable_to_coerce_without_prec;
@@ -2806,10 +2794,13 @@ rb_inum_convert_to_BigDecimal(VALUE val, RB_UNUSED_VAR(size_t digs), int raise_e https://github.com/ruby/ruby/blob/trunk/ext/bigdecimal/bigdecimal.c#L2794
     }
 }
 
+static VALUE rb_rational_convert_to_BigDecimal(VALUE val, size_t digs, int raise_exception);
+
 static VALUE
 rb_float_convert_to_BigDecimal(VALUE val, size_t digs, int raise_exception)
 {
     double d = RFLOAT_VALUE(val);
+
     if (!isfinite(d)) {
         Real *vp = VpCreateRbObject(1, NULL, true);  /* vp->obj is allocated */
         VpDtoV(vp, d);
@@ -2829,7 +2820,18 @@ rb_float_convert_to_BigDecimal(VALUE val, size_t digs, int raise_exception) https://github.com/ruby/ruby/blob/trunk/ext/bigdecimal/bigdecimal.c#L2820
         rb_raise(rb_eArgError, "precision too large.");
     }
 
-    Real *vp = GetVpValueWithPrec(val, digs, 1);
+    if (d != 0.0) {
+        val = rb_funcall(val, id_to_r, 0);
+        return rb_rational_convert_to_BigDecimal(val, digs, raise_exception);
+    }
+
+    Real *vp;
+    if (1/d < 0.0) {
+        vp = VpCreateRbObject(digs, "-0", true);
+    }
+    else {
+        vp = VpCreateRbObject(digs, "0", true);
+    }
     return check_exception(vp->obj);
 }
 
-- 
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