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Hannes Mueller authored
Old solution to avoid warning with gcc flag -Wconversion does not work with gcc >=4.3 since the behaviour for that flag has been changed, ref. http://gcc.gnu.org/wiki/NewWconversion. Now cast for __builtin_clzl is required, which itself is declared to return int. https://bugzilla.gnome.org/show_bug.cgi?id=619026
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