[Bug tree-optimization/114269] [14 Regression] Multiple 3-6% exec time regressions of 434.zeusmp since r14-9193-ga0b1798042d033

2024-03-19 Thread rguenth at gcc dot gnu.org via Gcc-bugs 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114269

Richard Biener  changed:

   What|Removed |Added

 Resolution|--- |FIXED
 Status|REOPENED|RESOLVED

--- Comment #9 from Richard Biener  ---
So the change has been reverted, we should be back to normal.

[Bug tree-optimization/114269] [14 Regression] Multiple 3-6% exec time regressions of 434.zeusmp since r14-9193-ga0b1798042d033

2024-03-19 Thread cvs-commit at gcc dot gnu.org via Gcc-bugs 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114269

--- Comment #8 from GCC Commits  ---
The master branch has been updated by Richard Biener :

https://gcc.gnu.org/g:e0e9499aeffdaca88f0f29334384aa5f710a81a4

commit r14-9540-ge0e9499aeffdaca88f0f29334384aa5f710a81a4
Author: Richard Biener 
Date:   Tue Mar 19 12:24:08 2024 +0100

tree-optimization/114151 - revert PR114074 fix

The following reverts the chrec_fold_multiply fix and only keeps
handling of constant overflow which keeps the original testcase
fixed.  A better solution might involve ranger improvements or
tracking of assumptions during SCEV analysis similar to what niter
analysis does.

PR tree-optimization/114151
PR tree-optimization/114269
PR tree-optimization/114322
PR tree-optimization/114074
* tree-chrec.cc (chrec_fold_multiply): Restrict the use of
unsigned arithmetic when actual overflow on constant operands
is observed.

* gcc.dg/pr68317.c: Revert last change.

[Bug tree-optimization/114269] [14 Regression] Multiple 3-6% exec time regressions of 434.zeusmp since r14-9193-ga0b1798042d033

2024-03-15 Thread law at gcc dot gnu.org via Gcc-bugs 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114269

Jeffrey A. Law  changed:

   What|Removed |Added

 CC||law at gcc dot gnu.org
   Priority|P3  |P2

[Bug tree-optimization/114269] [14 Regression] Multiple 3-6% exec time regressions of 434.zeusmp since r14-9193-ga0b1798042d033

2024-03-12 Thread pheeck at gcc dot gnu.org via Gcc-bugs 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114269

Filip Kastl  changed:

   What|Removed |Added

 Resolution|FIXED   |---
 Status|RESOLVED|REOPENED
Summary|[14 Regression] Multiple|[14 Regression] Multiple
   |3-27% exec time regressions |3-6% exec time regressions
   |of 434.zeusmp since |of 434.zeusmp since
   |r14-9193-ga0b1798042d033|r14-9193-ga0b1798042d033

--- Comment #7 from Filip Kastl  ---
Nice, our LNT instance already shows that the patch sped up 434.zeusmp. However
I'd like to reopen this bug since the benchmark didn't return to its original
values. At least some configurations are still slower than before
r14-9193-ga0b1798042d033:

Intel Skylake -Ofast -march=native (~5% regression)
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=798.80.0

Intel Skylake -Ofast -march=native -flto PGO (~5% regression)
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=785.80.0

AMD Zen3 -Ofast -march=native -flto (~6% regression)
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=476.80.0

AMD Zen3 -Ofast -march=native -flto PGO (~4% regression)
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=474.80.0

AMD Zen2 -Ofast -march=native -flto (~3% regression)
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=289.80.0