digitalmars.D.bugs - [Issue 9477] New: String (and array) comparisons are needlessly very slow
- d-bugmail puremagic.com (27/27) Feb 08 2013 http://d.puremagic.com/issues/show_bug.cgi?id=9477
- d-bugmail puremagic.com (10/10) Mar 31 2013 http://d.puremagic.com/issues/show_bug.cgi?id=9477
- d-bugmail puremagic.com (11/11) Mar 31 2013 http://d.puremagic.com/issues/show_bug.cgi?id=9477
- d-bugmail puremagic.com (10/10) Apr 01 2013 http://d.puremagic.com/issues/show_bug.cgi?id=9477
http://d.puremagic.com/issues/show_bug.cgi?id=9477 Summary: String (and array) comparisons are needlessly very slow Product: D Version: D2 Platform: All OS/Version: All Status: NEW Keywords: performance Severity: enhancement Priority: P2 Component: DMD AssignedTo: nobody puremagic.com ReportedBy: thecybershadow gmail.com 11:18:10 EET --- While profiling one of my programs, I've noticed a performance issue in an area that I wouldn't expect to be slow: string comparisons. It looks like array comparisons go through the rather convoluted TypeInfo equality code, which contains a few indirect calls and calls to runtime code. It can be inlined/optimized to a length comparison and a memcmp call. If the length is known (static arrays), the length check can be skipped, and for short arrays the comparison can even be inlined. Bearophile previously reported this problem for static arrays in issue 6658. I should note that a slice copy currently compiles to a memcpy call. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Feb 08 2013
http://d.puremagic.com/issues/show_bug.cgi?id=9477 Walter Bright <bugzilla digitalmars.com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |bugzilla digitalmars.com 00:59:25 PDT --- https://github.com/D-Programming-Language/dmd/pull/1766 -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Mar 31 2013
http://d.puremagic.com/issues/show_bug.cgi?id=9477 Commits pushed to master at https://github.com/D-Programming-Language/dmd https://github.com/D-Programming-Language/dmd/commit/c984175cf25dfa17b3956e8e33ff83547fa56b0a Optimize simple array comparison (Issue 9477) https://github.com/D-Programming-Language/dmd/commit/8b9d88d19fe4bb239209c004230fd5ac271436c3 Optimize simple array comparisons (Issue 9477) -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Mar 31 2013
http://d.puremagic.com/issues/show_bug.cgi?id=9477 bearophile_hugs eml.cc changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |bearophile_hugs eml.cc See also Issue 6658 -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Apr 01 2013