[Bug c/56281] missed VRP optimization from undefined left shift in ISO C99

jakub at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Mon Feb 11 06:57:00 GMT 2013


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56281

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-11 06:57:30 UTC ---
Given the amount of code in the wild that assumes 1 << 31 etc. work, I think it
would be a bad idea to try to optimize this for C99, especially when it is now
considered valid for C++.



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