public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
* [Bug target/112879] New: [14 Regression] 4% exec time regression of 525.x264_r on AMD Zen4 @ 2023-12-06 11:09 fkastl at suse dot cz 2023-12-06 11:37 ` [Bug target/112879] " rguenth at gcc dot gnu.org ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: fkastl at suse dot cz @ 2023-12-06 11:09 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112879 Bug ID: 112879 Summary: [14 Regression] 4% exec time regression of 525.x264_r on AMD Zen4 Product: gcc Version: 14.0 Status: UNCONFIRMED Keywords: needs-bisection Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: fkastl at suse dot cz Target Milestone: --- Host: x86_64-pc-linux-gnu Target: x86_64-pc-linux-gnu There's a 4% slowdown of 525.x264_r on AMD Zen4 between commits g:af7fa3135b6b046f g:e85c596ae2d1e5f5 Here is a plot showing this regression: https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=958.377.0 I've seen this regression on two different Zen4 machines but haven't observed it on machines with different architecture. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/112879] [14 Regression] 4% exec time regression of 525.x264_r on AMD Zen4 2023-12-06 11:09 [Bug target/112879] New: [14 Regression] 4% exec time regression of 525.x264_r on AMD Zen4 fkastl at suse dot cz @ 2023-12-06 11:37 ` rguenth at gcc dot gnu.org 2023-12-06 12:19 ` liuhongt at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: rguenth at gcc dot gnu.org @ 2023-12-06 11:37 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112879 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |14.0 CC| |liuhongt at gcc dot gnu.org --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- Possibly the reduc_* support in the backend now BB vectorizes unprofitable cases. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/112879] [14 Regression] 4% exec time regression of 525.x264_r on AMD Zen4 2023-12-06 11:09 [Bug target/112879] New: [14 Regression] 4% exec time regression of 525.x264_r on AMD Zen4 fkastl at suse dot cz 2023-12-06 11:37 ` [Bug target/112879] " rguenth at gcc dot gnu.org @ 2023-12-06 12:19 ` liuhongt at gcc dot gnu.org 2024-02-13 10:13 ` pheeck at gcc dot gnu.org 2024-02-13 10:14 ` pheeck at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: liuhongt at gcc dot gnu.org @ 2023-12-06 12:19 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112879 --- Comment #2 from Hongtao Liu <liuhongt at gcc dot gnu.org> --- (In reply to Richard Biener from comment #1) > Possibly the reduc_* support in the backend now BB vectorizes unprofitable > cases. maybe zmm reduction, and we should have reasonable cost for reduction vec_to_scalar. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/112879] [14 Regression] 4% exec time regression of 525.x264_r on AMD Zen4 2023-12-06 11:09 [Bug target/112879] New: [14 Regression] 4% exec time regression of 525.x264_r on AMD Zen4 fkastl at suse dot cz 2023-12-06 11:37 ` [Bug target/112879] " rguenth at gcc dot gnu.org 2023-12-06 12:19 ` liuhongt at gcc dot gnu.org @ 2024-02-13 10:13 ` pheeck at gcc dot gnu.org 2024-02-13 10:14 ` pheeck at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: pheeck at gcc dot gnu.org @ 2024-02-13 10:13 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112879 Filip Kastl <pheeck at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |DUPLICATE Status|UNCONFIRMED |RESOLVED --- Comment #3 from Filip Kastl <pheeck at gcc dot gnu.org> --- This slowdown is also reported in pr113600 along with two other configurations where the slowdown occurs. It could be possible that these three configurations are different slowdowns with different causes. I find that unlikely though. I've even bisected this LTO PGO slowdown to the same commit as Martin Jambor did with the PGO slowdown (r14-5603-g2b59e2b4dff421). So I'm marking this as a duplicate of pr113600. *** This bug has been marked as a duplicate of bug 113600 *** ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/112879] [14 Regression] 4% exec time regression of 525.x264_r on AMD Zen4 2023-12-06 11:09 [Bug target/112879] New: [14 Regression] 4% exec time regression of 525.x264_r on AMD Zen4 fkastl at suse dot cz ` (2 preceding siblings ...) 2024-02-13 10:13 ` pheeck at gcc dot gnu.org @ 2024-02-13 10:14 ` pheeck at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: pheeck at gcc dot gnu.org @ 2024-02-13 10:14 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112879 Filip Kastl <pheeck at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords|needs-bisection | --- Comment #4 from Filip Kastl <pheeck at gcc dot gnu.org> --- This slowdown is also reported in pr113600 along with two other configurations where the slowdown occurs. It could be possible that these three configurations are different slowdowns with different causes. I find that unlikely though. I've even bisected this LTO PGO slowdown to the same commit as Martin Jambor did with the PGO slowdown (r14-5603-g2b59e2b4dff421). So I'm marking this as a duplicate of pr113600. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2024-02-13 10:14 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2023-12-06 11:09 [Bug target/112879] New: [14 Regression] 4% exec time regression of 525.x264_r on AMD Zen4 fkastl at suse dot cz 2023-12-06 11:37 ` [Bug target/112879] " rguenth at gcc dot gnu.org 2023-12-06 12:19 ` liuhongt at gcc dot gnu.org 2024-02-13 10:13 ` pheeck at gcc dot gnu.org 2024-02-13 10:14 ` pheeck at gcc dot gnu.org
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).