[Bug fortran/126964] [17 Regression] 4-5% slowdown of tonto of Zen{2,3,4,5} since r17-3342-gf3943597388db4

"jvdelisle at gcc dot gnu.org via Gcc-bugs" <[email protected]>
Newsgroups gmane.comp.gcc.bugs
Message-ID <[email protected]/bugzilla/> 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126964

--- Comment #2 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
Created attachment 65378
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65378&action=edit
A patch to test with actual benchmark

I downloaded the modern version of tonto and could not reproduce. So I
proceeded with a hunch that unnecessary copy in/out cycles were burning. Did
some profiling. The attached patch is a lot of speculation on my part.

If someone would please test and see if this fixes it?
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