[Bug target/87355] missed comparison optimizations (grep DFA, x86-64)

[eggert at cs dot ucla.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87355

--- Comment #1 from eggert at cs dot ucla.edu ---
Created attachment 44721
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44721&action=edit
Assembly-language output of 'gcc -O2 -S t.c'