------- Additional Comments From dahowell at directv dot com 2005-06-23 23:48 ------- Created an attachment (id=9138) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=9138&action=view) Short test file which demonstrates optimization failuer
This is pretty much what was left of basic_string.h after I removed all the code which was not needed to cause the bug to happen. For the curious, S was derived from the basic_string template, A was derived from the allocator object, and p used to be the _M_rep pointer to the basic_string::_Rep structure. S::init was once basic_string::append. The function do_nothing was once the allocator's dispose method, but as you can see it now truly should do nothing. But it doesn't quite do nothing, it causes the optimizer to fail when optimizing for size. The seemingly pointless static_cast<A> also is needed to cause the bug. Inlining either S::init or do_nothing will also make the bug magically disappear. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22167
