[pypy-commit] pypy default: Expand the comment

[arigo]

Author: Armin Rigo <arigo at tunes.org>
Branch: 
Changeset: r69101:61a9f16c3e8b
Date: 2014-02-08 11:35 +0100
http://bitbucket.org/pypy/pypy/changeset/61a9f16c3e8b/

Log:	Expand the comment

diff --git a/rpython/jit/metainterp/history.py b/rpython/jit/metainterp/history.py
--- a/rpython/jit/metainterp/history.py
+++ b/rpython/jit/metainterp/history.py
@@ -276,8 +276,9 @@
     def same_constant(self, other):
         if isinstance(other, ConstFloat):
             # careful in this comparison: if self.value and other.value
-            # are both NaN, stored as regular floats, then it will turn
-            # out to be false...
+            # are both NaN, stored as regular floats (i.e. on 64-bit),
+            # then just using "==" would say False: two NaNs are always
+            # different from each other.
             return (longlong.extract_bits(self.value) ==
                     longlong.extract_bits(other.value))
         return False