[Bug tree-optimization/79196] [7 Regression] Probably invalid folding of strstr(x, "foo") eq x to memcmp (x, "foo", strlen("foo"))

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79196

--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 40565
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40565&action=edit
Untested patch