On 11/22/19 5:52 PM, Paul Eggert wrote: > If we do want to tune grep for set-like operations, that suggests doing some > surgery to its internals rather than merely fiddling with -O flags.
Since I last wrote, some of that surgery has been done by another grep contributor, and a simple 'grep -f file1 file2' benchmark that I just now tried sped up from 47 seconds (for grep 3.1) to 2.3 seconds (for the next version of grep). So this algorithmic change should far outweigh any GCC optimization level change. Anyway, the topic seems to have died down so I'm closing the bug report.
