From 6731f935cc0460852ab36a21aaacd5e30d6b4842 Mon Sep 17 00:00:00 2001
From: KOBAYASHI Shuji <shuujii@gmail.com>
Date: Thu, 18 Mar 2021 17:10:51 +0900
Subject: `Float::NAN/0` should be `Float::NAN`; ref a0b3378b3

#### Before this patch:

```console
$ bin/mruby -e 'p(Float::NAN/0)'
Infinity
```

#### After this patch (same as Ruby):

```console
$ bin/mruby -e 'p(Float::NAN/0)'
NaN
```
---
 src/numeric.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/numeric.c b/src/numeric.c
index 51137d45b..c536f0614 100644
--- a/src/numeric.c
+++ b/src/numeric.c
@@ -25,7 +25,6 @@
 #define floor(f) floorf(f)
 #define ceil(f) ceilf(f)
 #define fmod(x,y) fmodf(x,y)
-#define copysign(x,y) copysignf(x,y)
 #define FLO_TO_STR_PREC 8
 #else
 #define FLO_TO_STR_PREC 16
@@ -245,9 +244,7 @@ mrb_num_div_flo(mrb_state *mrb, mrb_float x, mrb_float y)
     return NAN;
   }
   else {
-    mrb_float a = copysign(1.0, x);
-    mrb_float b = copysign(1.0, y);
-    return a * b * INFINITY;
+    return x * (signbit(y) ? -1.0 : 1.0) * INFINITY;
   }
 }
 
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