[Bug tree-optimization/94043] [9/10 Regression] ICE in superloop_at_depth, at cfgloop.c:78

[linkw at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94043

--- Comment #12 from Kewen Lin <linkw at gcc dot gnu.org> ---
Created attachment 48122
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48122&action=edit
ppc64le tested patch

Thanks Richi!

A patch draft attached to ensure on the right track, also
bootstrapped/regresstested. I tried to reproduce the case that the stmts for
lane extracting is empty (due to folding) with test cases associated in that
old commit but failed. I think we don't need to deal with it? The new copy
assignment instead of the phi could not be caught by the LC-PHI check in
expand_simple_operations.