From 66e2928bd481a0dd2762da9428af39b3384c0852 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Tue, 8 Aug 2017 02:13:11 +0900
Subject: Float values divided by zero should honor signs; fix #3766

It also fixes unexpected resurrection of #3745 by #3752
---
 src/vm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'src/vm.c')

diff --git a/src/vm.c b/src/vm.c
index 1d445563b..3eced7e89 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -2389,8 +2389,10 @@ RETRY_TRY_BLOCK:
           mrb_int x = mrb_fixnum(regs[a]);
           mrb_int y = mrb_fixnum(regs[a+1]);
           double f;
-          if (y == 0 && x != 0) {
-            f = INFINITY;
+          if (y == 0) {
+            if (x == 0) f = NAN;
+            else if (x > 0) f = INFINITY;
+            else if (x < 0) f = -INFINITY;
           }
           else {
             f = (mrb_float)x / (mrb_float)y;
-- 
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