[Bug rtl-optimization/93165] avoidable 2x penalty on unpredicted overwrite

[ncm at cantrip dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93165

--- Comment #1 from ncm at cantrip dot org ---
Created attachment 47592
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47592&action=edit
code demonstrating the failure