[Bug target/78614] [7 Regression] ICE error: invalid rtl sharing found in the insn (verify_rtx_sharing) gcc/emit-rtl.c:2743

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78614

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 40205
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40205&action=edit
gcc7-pr78614-2.patch

Perhaps better patch (if it works).  The previous patch would copy even rtxes
that simplify_*rtx would copy again, while this one should hopefully just mark
those non-shareable rtxes that are going to stay in PARALLEL as used and then
at the end we would unshare only whatever remained shared at the end.
It works on the provided testcase in the cross too.