[Bug c++/91895] Compile the code with -O1 or -O2 is slower than with -O3 and -Os

[hehaochen at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91895

--- Comment #1 from hehaochen at hotmail dot com <hehaochen at hotmail dot com> 
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I think maybe the problem has already been fixed since gcc 5?