[Bug tree-optimization/83190] missing strlen optimization of the empty string

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83190

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

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

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The strlen pass doesn't track of all the string lengths though, that would be
prohibitive, at least with the current infrastructure (say char a[1000000] =
{}; just notes that strlen(a) is 0, not that strlen(a + 253) is also 0.
Generally, the entry for such a pointer is only created when such pointer is
constructed, and at that point it is too late to find the length from the
earlier initializer.