[Bug tree-optimization/83518] [8 Regression] Missing optimization: useless instructions should be dropped

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83518

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

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

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
We do vectorize this and thus not unroll it since r253975.
With -O3 -fno-vect-cost-model we've generated what GCC 8 emits or something
similar for many years, including 4.4+ (r140264 already shows this behavior).