From d4b75f6b6822885e331c69a74e56e23af40a6264 Mon Sep 17 00:00:00 2001
From: Damien George
Date: Mon, 4 Sep 2017 14:16:27 +1000
Subject: py/obj: Fix comparison of float/complex NaN with itself.

IEEE floating point is specified such that a comparison of NaN with itself
returns false, and Python respects these semantics.  This patch makes uPy
also have these semantics.  The fix has a minor impact on the speed of the
object-equality fast-path, but that seems to be unavoidable and it's much
more important to have correct behaviour (especially in this case where
the wrong answer for nan==nan is silently returned).
---
 tests/float/float1.py | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'tests/float/float1.py')

diff --git a/tests/float/float1.py b/tests/float/float1.py
index 93f6f014c..137dacc23 100644
--- a/tests/float/float1.py
+++ b/tests/float/float1.py
@@ -60,6 +60,11 @@ print(1.2 <= -3.4)
 print(1.2 >= 3.4)
 print(1.2 >= -3.4)
 
+# comparison of nan is special
+nan = float('nan')
+print(nan == 1.2)
+print(nan == nan)
+
 try:
     1.0 / 0
 except ZeroDivisionError:
-- 
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