[Bug tree-optimization/77498] [7 regression] Performance drop after r239414 on spec2000/172mgrid

[ysrumyan at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77498

--- Comment #1 from Yuri Rumyantsev <ysrumyan at gmail dot com> ---
Created attachment 39574
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39574&action=edit
test-case to reproduce

Need to compile with -O2 -ffast-math to reproduce.