https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82345
Bug ID: 82345
Summary: low performance (comparing to clang)
Product: gcc
Version: 7.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: claprix at yandex dot ru
Target Milestone: ---
String search is slow for this code.
$ g++ -O2 -DNDEBUG -std=c++14 gcc_perf_buf.cc && time ./a.out shodan/huge01.txt
real 0m0.470s
user 0m0.367s
sys 0m0.104s
$ clang++ -O2 -DNDEBUG -std=c++14 gcc_perf_buf.cc && time ./a.out
shodan/huge01.txt
real 0m0.248s
user 0m0.179s
sys 0m0.069s
$ gcc --version
gcc (Ubuntu 7.2.0-7ubuntu1) 7.2.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ lsb_release -d
Description: Ubuntu Artful Aardvark (development branch)
