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* [Bug middle-end/116790] New: [15 Regression] 6% slowdown of 454.calculix on AMD Zen 3
@ 2024-09-20 15:28 pheeck at gcc dot gnu.org
2024-09-20 15:28 ` [Bug middle-end/116790] " pheeck at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: pheeck at gcc dot gnu.org @ 2024-09-20 15:28 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116790
Bug ID: 116790
Summary: [15 Regression] 6% slowdown of 454.calculix on AMD Zen
3
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Keywords: missed-optimization, needs-bisection
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: pheeck at gcc dot gnu.org
Blocks: 26163
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
As seen here
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=693.170.0
there was a 6% exec time slowdown of the 454.calculix SPEC 2006 benchmark
between commits
r15-3426-g36f63000c6f869
r15-3550-g75a4143d69a842
when run with -O2 -march=generic -flto PGO on an AMD Zen 3 machine.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
[Bug 26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95)
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug middle-end/116790] [15 Regression] 6% slowdown of 454.calculix on AMD Zen 3 2024-09-20 15:28 [Bug middle-end/116790] New: [15 Regression] 6% slowdown of 454.calculix on AMD Zen 3 pheeck at gcc dot gnu.org @ 2024-09-20 15:28 ` pheeck at gcc dot gnu.org 2024-09-23 8:06 ` [Bug middle-end/116790] [15 Regression] 6% slowdown of 454.calculix on AMD Zen 3 since r15-3509-gd34cda72098867 pheeck at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: pheeck at gcc dot gnu.org @ 2024-09-20 15:28 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116790 Filip Kastl <pheeck at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |15.0 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/116790] [15 Regression] 6% slowdown of 454.calculix on AMD Zen 3 since r15-3509-gd34cda72098867 2024-09-20 15:28 [Bug middle-end/116790] New: [15 Regression] 6% slowdown of 454.calculix on AMD Zen 3 pheeck at gcc dot gnu.org 2024-09-20 15:28 ` [Bug middle-end/116790] " pheeck at gcc dot gnu.org @ 2024-09-23 8:06 ` pheeck at gcc dot gnu.org 2024-09-23 9:16 ` rguenth at gcc dot gnu.org 2024-09-23 9:23 ` pheeck at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: pheeck at gcc dot gnu.org @ 2024-09-23 8:06 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116790 Filip Kastl <pheeck at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|[15 Regression] 6% slowdown |[15 Regression] 6% slowdown |of 454.calculix on AMD Zen |of 454.calculix on AMD Zen |3 |3 since | |r15-3509-gd34cda72098867 CC| |rguenth at gcc dot gnu.org Keywords|needs-bisection | --- Comment #1 from Filip Kastl <pheeck at gcc dot gnu.org> --- Bisected to r15-3509-gd34cda72098867. Cc-ing richi. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/116790] [15 Regression] 6% slowdown of 454.calculix on AMD Zen 3 since r15-3509-gd34cda72098867 2024-09-20 15:28 [Bug middle-end/116790] New: [15 Regression] 6% slowdown of 454.calculix on AMD Zen 3 pheeck at gcc dot gnu.org 2024-09-20 15:28 ` [Bug middle-end/116790] " pheeck at gcc dot gnu.org 2024-09-23 8:06 ` [Bug middle-end/116790] [15 Regression] 6% slowdown of 454.calculix on AMD Zen 3 since r15-3509-gd34cda72098867 pheeck at gcc dot gnu.org @ 2024-09-23 9:16 ` rguenth at gcc dot gnu.org 2024-09-23 9:23 ` pheeck at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: rguenth at gcc dot gnu.org @ 2024-09-23 9:16 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116790 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2024-09-23 Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org Ever confirmed|0 |1 --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- I will eventually have a look. LNT indeed only has zen3 regressing in this unusal config (-O2 -flto + PGO), but maybe Zen3 is the only machine testing this config(?). It'll be somewhat difficult to investigate and also somewhat low priority given it uses -O2 and generic tuning / basic x86-64. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/116790] [15 Regression] 6% slowdown of 454.calculix on AMD Zen 3 since r15-3509-gd34cda72098867 2024-09-20 15:28 [Bug middle-end/116790] New: [15 Regression] 6% slowdown of 454.calculix on AMD Zen 3 pheeck at gcc dot gnu.org ` (2 preceding siblings ...) 2024-09-23 9:16 ` rguenth at gcc dot gnu.org @ 2024-09-23 9:23 ` pheeck at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: pheeck at gcc dot gnu.org @ 2024-09-23 9:23 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116790 --- Comment #3 from Filip Kastl <pheeck at gcc dot gnu.org> --- (In reply to Richard Biener from comment #2) > I will eventually have a look. LNT indeed only has zen3 regressing in this > unusal config (-O2 -flto + PGO), but maybe Zen3 is the only machine testing > this config(?). I've just checked and we actually also test O2 generic lto pgo on Zen4 and Aarch64. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2024-09-23 9:23 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2024-09-20 15:28 [Bug middle-end/116790] New: [15 Regression] 6% slowdown of 454.calculix on AMD Zen 3 pheeck at gcc dot gnu.org 2024-09-20 15:28 ` [Bug middle-end/116790] " pheeck at gcc dot gnu.org 2024-09-23 8:06 ` [Bug middle-end/116790] [15 Regression] 6% slowdown of 454.calculix on AMD Zen 3 since r15-3509-gd34cda72098867 pheeck at gcc dot gnu.org 2024-09-23 9:16 ` rguenth at gcc dot gnu.org 2024-09-23 9:23 ` pheeck at gcc dot gnu.org
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