[Bug tree-optimization/79245] [7 Regression] Inefficient loop distribution to memcpy

[jgreenhalgh at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79245

--- Comment #9 from James Greenhalgh <jgreenhalgh at gcc dot gnu.org> ---
> I'm curious how that benchmarks for you (with -ftree-loop-distribution vs.
> without).

Taking trunk as 100%, I see a 2% gain on trunk with
-fno-tree-loop-distribution-patterns , and 1% gain with your patch applied.

I'm not sure where the other 1% is going. There are a few more examples of new
memcpy calls in MAIN_ and inital_ , but they don't look hot so it may just be a
second-order effect.

Thanks for the fix.