[Bug tree-optimization/84106] gcc is not able to vectorize code for 1D array, but does so for 2D array of the same size

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84106

Richard Biener <rguenth at gcc dot gnu.org> changed:

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

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Try -fno-tree-loop-distribute-patterns.  The test2 loop is recognized as memcpy
and expanded as such.  Theory (and practice?) is that the emitted rep movsq
is faster than the vectorized loop.