X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fcount-one-bits.h;h=1d84ef0fff151bd58937a1c867f736e98e19a576;hb=107fb0e6719c49e35a6f4a3bdd0dabb19291efe0;hp=ae8a5a89bf30bb7a9b00868739d710864928d3ce;hpb=d8965b7823ae5167a60fa39ad91b9fdc26280513;p=gnulib.git

diff --git a/lib/count-one-bits.h b/lib/count-one-bits.h
index ae8a5a89b..1d84ef0ff 100644
--- a/lib/count-one-bits.h
+++ b/lib/count-one-bits.h
@@ -1,5 +1,5 @@
 /* count-one-bits.h -- counts the number of 1-bits in a word.
-   Copyright (C) 2007-2008 Free Software Foundation, Inc.
+   Copyright (C) 2007-2010 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -30,6 +30,8 @@
         return BUILTIN (x);
 #else
 #define COUNT_ONE_BITS(BUILTIN, TYPE)                                       \
+        /* This condition is written so as to avoid shifting by more than   \
+           31 bits at once, and also avoids a random HP-UX cc bug.  */      \
         verify (((TYPE) -1 >> 31 >> 31 >> 2) == 0); /* TYPE has at most 64 bits */ \
         int count = count_one_bits_32 (x);                                  \
         if (1 < (TYPE) -1 >> 31) /* TYPE has more than 32 bits? */          \