From e29efb02bdaa47384eabd44031fac5ffd8ce30e0 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Sat, 15 Feb 2014 19:59:26 +0900
Subject: normalize NaN after division that may generate NaN; fix #1712

---
 src/vm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/vm.c b/src/vm.c
index 52510c98d..e82806e4d 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -7,6 +7,7 @@
 #include <setjmp.h>
 #include <stddef.h>
 #include <stdarg.h>
+#include <math.h>
 #include "mruby.h"
 #include "mruby/array.h"
 #include "mruby/class.h"
@@ -1712,6 +1713,11 @@ mrb_context_run(mrb_state *mrb, struct RProc *proc, mrb_value self, unsigned int
       default:
         goto L_SEND;
       }
+#ifdef MRB_NAN_BOXING
+      if (isnan(regs[a].attr_f)) {
+        regs[a] = mrb_float_value(mrb, regs[a].attr_f);
+      }
+#endif
       NEXT;
     }
 
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