From c198d0599b7be72a1b88c7573897d7535cd89678 Mon Sep 17 00:00:00 2001
From: Antoine Pitrou <solipsis@pitrou.net>
Date: Thu, 13 Oct 2011 18:07:37 +0200
Subject: Add a comment explaining this heuristic.

---
 Objects/stringlib/fastsearch.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Objects/stringlib/fastsearch.h b/Objects/stringlib/fastsearch.h
index 0f7aea7..eb3d694 100644
--- a/Objects/stringlib/fastsearch.h
+++ b/Objects/stringlib/fastsearch.h
@@ -115,6 +115,9 @@ FASTSEARCH(const STRINGLIB_CHAR* s, Py_ssize_t n,
             unsigned char needle;
             needle = p[0] & 0xff;
 #if STRINGLIB_SIZEOF_CHAR > 1
+            /* If looking for a multiple of 256, we'd have two
+               many false positives looking for the '\0' byte in UCS2
+               and UCS4 representations. */
             if (needle != 0)
 #endif
                 return STRINGLIB(fastsearch_memchr_1char)
-- 
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